Quote from adys15 on April 18th, 2012, 07:18 PM

common guys help me with those caps,nobody knows?

I don't know, PM Tony, if any one would know he would.

Quote from adys15 on April 18th, 2012, 07:18 PM

common guys help me with those caps,nobody knows?

It is not important if you use ceramic or polyester capacitors, their only difference is the way they are constructed, not the way they will function in your circuits. The only thing you need to take into account is if you use polarized or non-polarized caps.  Some like the 10uF pulse indicator cap and the 100nF between pin 6 and 7 of the 4046 must be non-polarized. If you compare several images of different vic cards you will notice meyer also used different types of caps for the same positions.

Quote from Sharky on April 18th, 2012, 11:41 PM

Quote from adys15 on April 18th, 2012, 07:18 PM

common guys help me with those caps,nobody knows?

It is not important if you use ceramic or polyester capacitors, their only difference is the way they are constructed, not the way they will function in your circuits. The only thing you need to take into account is if you use polarized or non-polarized caps.  Some like the 10uF pulse indicator cap and the 100nF between pin 6 and 7 of the 4046 must be non-polarized. If you compare several images of different vic cards you will notice meyer also used different types of caps for the same positions.

The dark red/brown caps look like Mylar, the tan colored caps look like ceramic, and the yellow ones look like tantalum caps.

Thank you Tony ,

Your contributions are very helpful  to group as some of us are very mechanical

but just not as familiar with circuits side thank you,
interesting as,
as  we post,  others  reading the post and  than  spark comes on in the minds
 and respond with new info so it all helps it along well.

PLease check these out

https://docs.google.com/document/d/1PUbnIC9T4fFCtiWzO80ulQ7TnptSzliGQcu8V3DHzOo/edit

https://docs.google.com/document/d/1SiPuaX_kvldohC_BSPG9Q8TLQQ1sa8AQby5PdsKd0kk/edit

Tony is it possible for you to post copies
of Schematics or pcb's for Vic 8xa or others in Gerber formats?

Kindest Regards
Daniel

Quote from securesupplies on April 19th, 2012, 07:33 AM

Thank you Tony ,

Your contributions are very helpful  to group as some of use are very mechanical

but just not as familiar with circuits side thank you,
interesting as,
as  we post others  reading than  spark and respond with new info so it all helps it along well.

PLease check these out

https://docs.google.com/document/d/1PUbnIC9T4fFCtiWzO80ulQ7TnptSzliGQcu8V3DHzOo/edit

https://docs.google.com/document/d/1SiPuaX_kvldohC_BSPG9Q8TLQQ1sa8AQby5PdsKd0kk/edit

Tony is it possible for you to post copies
of Schematics or pcb's for Vic 8xa or others in Gerber formats?

Kindest Regards
Daniel

Here's the 8XA and VIC circuits with Gerber Files for an Excellon machine.

Quote from TonyWoodside on April 19th, 2012, 10:59 PM

Quote from securesupplies on April 19th, 2012, 07:33 AM

Thank you Tony ,

Your contributions are very helpful  to group as some of use are very mechanical

but just not as familiar with circuits side thank you,
interesting as,
as  we post others  reading than  spark and respond with new info so it all helps it along well.

PLease check these out

https://docs.google.com/document/d/1PUbnIC9T4fFCtiWzO80ulQ7TnptSzliGQcu8V3DHzOo/edit

https://docs.google.com/document/d/1SiPuaX_kvldohC_BSPG9Q8TLQQ1sa8AQby5PdsKd0kk/edit

Tony is it possible for you to post copies
of Schematics or pcb's for Vic 8xa or others in Gerber formats?

Kindest Regards
Daniel

Here's the 8XA and VIC circuits with Gerber Files for an Excellon machine.

Thank you Tony.

This will help,

Here is my Email  
securesupplies@hotmail.com
danieldonatelli@hotmail.com
Mb + 66 899093178

which is best email for you
Daniel

Quote from TonyWoodside on April 19th, 2012, 12:00 AM

Quote from Sharky on April 18th, 2012, 11:41 PM

Quote from adys15 on April 18th, 2012, 07:18 PM

common guys help me with those caps,nobody knows?

It is not important if you use ceramic or polyester capacitors, their only difference is the way they are constructed, not the way they will function in your circuits. The only thing you need to take into account is if you use polarized or non-polarized caps.  Some like the 10uF pulse indicator cap and the 100nF between pin 6 and 7 of the 4046 must be non-polarized. If you compare several images of different vic cards you will notice meyer also used different types of caps for the same positions.

The dark red/brown caps look like Mylar, the tan colored caps look like ceramic, and the yellow ones look like tantalum caps.

Thanks Tony I also thought that way,but wasn't sure,Sharky,i notice that Stan used diferent tips of caps on his boards.and there is a diference :ceramic and tantalum are used in very high freq aplications,and polyester ones used in normal apps,the 100nF between pin 6 and 7 is poliester and by saying there is nonpolirized that means the rest of polyester caps on the board are polirized,i think all polyester's are non-polirized,and there is one more nonpolirized cap(10uF) between the 2and 6 pins of 741 on the scanner...see link http://edatasl.blogspot.com/2009/11/capacitors.html

Member Tony and Sharky  Russ

Can we Post a Components  itemized Parts List
For Rustic , Vic , 8XA, alternator board or others like steam resonator board etc.  

or any others we have Schmatics traces done like
Gas Gun Cicuit, gas processor alternator circuit  etc .

Can we Make a more specific

PCB Design thread for each board
so it is focused on the rebuilder and on re building

 to keep it fast clean and simple that way we will
have faster uptake of rebuild trailing tech and giving feed back.

Straight up thread like

Vic PCB build
8xa PCB Build
alternator PCB build
Gas gun PCB
Gas Processor
rustic PCB build

Post in those threads

clear easy  Schematic/trace/ parts list /gerber/ jpg/ board layouts etc

so it becomes  fast and simple
 
as basic spec is cemented and firmed so these threads  
go to more viral status for trialing and user feed back at these threads.

So we can rebuild trail progress each design more agressively .

for  re builders to

give feed back on design performance and or improvements
or modifcations needed or learned for  updates to occur in those threads.

To progress tech to next level to finalize
and improve them  all to be functioning right on and progressive in advancing design

this will fuel the integration with other engine management systems more readily as other come on board.

such as Installers AND those familiar  ecu's reprogramming etc

Dan

Quote from securesupplies on April 21st, 2012, 05:56 AM

Member Tony and Sharky  Russ

Can we Post a Components  itemized Parts List
For Rustic , Vic , 8XA, alternator board or others like steam resonator board etc.  

or any others we have Schmatics traces done like
Gas Gun Cicuit, gas processor alternator circuit  etc .

Can we Make a more specific

PCB Design thread for each board
so it is focused on the rebuilder and on re building

 to keep it fast clean and simple that way we will
have faster uptake of rebuild trailing tech and giving feed back.

Straight up thread like

Vic PCB build
8xa PCB Build
alternator PCB build
Gas gun PCB
Gas Processor
rustic PCB build

Post in those threads

clear easy  Schematic/trace/ parts list /gerber/ jpg/ board layouts etc

so it becomes  fast and simple
 
as basic spec is cemented and firmed so these threads  
go to more viral status for trialing and user feed back at these threads.

So we can rebuild trail progress each design more agressively .

for  re builders to

give feed back on design performance and or improvements
or modifcations needed or learned for  updates to occur in those threads.

To progress tech to next level to finalize
and improve them  all to be functioning right on and progressive in advancing design

this will fuel the integration with other engine management systems more readily as other come on board.

such as Installers AND those familiar  ecu's reprogramming etc

Dan

I second this...:D Good idea getting all this diffrent sections even more orginized...:cool: it will speed up the whole proses, especialy for us builders but even for the testers and designers.:P

Boere groete,
Mechanic.

Quote from securesupplies on April 21st, 2012, 05:56 AM

Member Tony and Sharky  Russ

Can we Post a Components  itemized Parts List
For Rustic , Vic , 8XA, alternator board or others like steam resonator board etc.  

or any others we have Schmatics traces done like
Gas Gun Cicuit, gas processor alternator circuit  etc .

Can we Make a more specific

PCB Design thread for each board
so it is focused on the rebuilder and on re building

 to keep it fast clean and simple that way we will
have faster uptake of rebuild trailing tech and giving feed back.

Straight up thread like

Vic PCB build
8xa PCB Build
alternator PCB build
Gas gun PCB
Gas Processor
rustic PCB build

Post in those threads

clear easy  Schematic/trace/ parts list /gerber/ jpg/ board layouts etc

so it becomes  fast and simple
 
as basic spec is cemented and firmed so these threads  
go to more viral status for trialing and user feed back at these threads.

So we can rebuild trail progress each design more agressively .

for  re builders to

give feed back on design performance and or improvements
or modifcations needed or learned for  updates to occur in those threads.

To progress tech to next level to finalize
and improve them  all to be functioning right on and progressive in advancing design

this will fuel the integration with other engine management systems more readily as other come on board.

such as Installers AND those familiar  ecu's reprogramming etc

Dan

Some of these already  exist in the RWGResearch section

Vic PCB build
http://open-source-energy.org/?tid=170&page=14
rustic PCB build
http://open-source-energy.org/?tid=178
8xa PCB Build
http://open-source-energy.org/?tid=393


This sounds like a good idea though,  Maybe this would be good in the "Open Source Projects Section?"
http://open-source-energy.org/?fid=47

OK We have  Thread for all versions

Russtic

Tony's

and in Progress

we need to put part lists on threads
with part numbers on each

and move to next stage quickly alot more work to do.

please post parts lists .,

watching...

Finally got the pcb's in today. They look really nice and the quality looks good. I uploaded the gerber/drill files to the first post which were used to have them produced. I hope to solder one of them this week to test it electronically. Happy moving forward again!!

I also think it is time to start a new thread VIC V2.0 where we can start working on an improved version. Now that we understand its workings we can start doing things better. The gating part for example is using a lot of components while that can be done with a lot less, the same goes for the resonant scanning part, i think it can be replaced with a few added components to the 4046.

Anyway, ... enjoy, it has been fun doing for me!!

Quote from Sharky on April 25th, 2012, 01:34 AM

Finally got the pcb's in today. They look really nice and the quality looks good. I uploaded the gerber/drill files to the first post which were used to have them produced. I hope to solder one of them this week to test it electronically. Happy moving forward again!!

I also think it is time to start a new thread VIC V2.0 where we can start working on an improved version. Now that we understand its workings we can start doing things better. The gating part for example is using a lot of components while that can be done with a lot less, the same goes for the resonant scanning part, i think it can be replaced with a few added components to the 4046.

Anyway, ... enjoy, it has been fun doing for me!!

those look really nice!!! gold plating! :)

all, here is the new start to VIC V2.0

http://open-source-energy.org/?tid=463

Thanks ~Russ

Quote from Sharky on April 25th, 2012, 01:34 AM

Finally got the pcb's in today. They look really nice and the quality looks good. I uploaded the gerber/drill files to the first post which were used to have them produced. I hope to solder one of them this week to test it electronically. Happy moving forward again!!

I also think it is time to start a new thread VIC V2.0 where we can start working on an improved version. Now that we understand its workings we can start doing things better. The gating part for example is using a lot of components while that can be done with a lot less, the same goes for the resonant scanning part, i think it can be replaced with a few added components to the 4046.

Anyway, ... enjoy, it has been fun doing for me!!

Hi Sharky,

Looking good!

Questions: can you post a few scope shots of the following signals?
- scanner (triangle)
- pickup from opamp
- primary coil output (no coil connected)
- gating

Looks like your cell driver circuit gives lower current for the TIP120 than Stans.

What frequency did you use for the PLL circuit and scanner circuit.

What is the center frequency for the PLL to use to lock-on? (LPF)

How did you test this without a VIC on resonance?
Can you explain what function the SIG_PRIM has and why is it needed, because we have a pickup coil?

Thanks in advance, for answering my questions!

Best regards,
Webmug

Quote from Webmug on April 25th, 2012, 05:58 AM

Quote from Sharky on April 25th, 2012, 01:34 AM

Finally got the pcb's in today. They look really nice and the quality looks good. I uploaded the gerber/drill files to the first post which were used to have them produced. I hope to solder one of them this week to test it electronically. Happy moving forward again!!

I also think it is time to start a new thread VIC V2.0 where we can start working on an improved version. Now that we understand its workings we can start doing things better. The gating part for example is using a lot of components while that can be done with a lot less, the same goes for the resonant scanning part, i think it can be replaced with a few added components to the 4046.

Anyway, ... enjoy, it has been fun doing for me!!

Hi Sharky,

Looking good!

Questions: can you post a few scope shots of the following signals?
- scanner (triangle)
- pickup from opamp
- primary coil output (no coil connected)
- gating

Looks like your cell driver circuit gives lower current for the TIP120 than Stans.

What frequency did you use for the PLL circuit and scanner circuit.

What is the center frequency for the PLL to use to lock-on? (LPF)

How did you test this without a VIC on resonance?
Can you explain what function the SIG_PRIM has and why is it needed, because we have a pickup coil?

Thanks in advance, for answering my questions!

Best regards,
Webmug

aYes Very Nice   boards  like the bit about the caps also  
 can you post the schematics and gerber to new 2.0 thread please sharky.

Quote from ~Russ/Rwg42985 on March 26th, 2012, 11:28 AM

Quote from Webmug on March 26th, 2012, 10:12 AM

Quote from ~Russ/Rwg42985 on March 26th, 2012, 08:27 AM

Also. I think i want to redue the adjustable power schmatic. It will get more complacated but that's ok. I don't like the way it is now.

Webmug,

Can you post your schmatic of what you have done with this part of the schmatic.

I know your using a sig gen to get the duty cycle but we will use a 555 timer or somthing in the final set...

Thanks all! ~Russ

Yes, you can do this also. Takes a couple of more components. :) It works in combination with the "cell driver circuit".

The input J should have a adjustable duty cycle DU pulse 0 to 5V and frequency about 1kHz. This 1 to 99% DU controls the voltage amplitude.
You can do this with a 555 timer instead of a signal generator.

Offset is the min. voltage amplitude on the primary coil and gain the time it takes to go to max voltage amplitude, when you set it to 1%

This voltage amplitude control has a useful function, because it adjust the voltage "analog" and not in increment steps what disturbs the voltage.

I have problems keeping the DU signal 50% from the "cell driver circuit" when the PLL adjust frequency (scanner). 31 to 42% This is very important because this 50% gives us perfect resonance and is picked-up at the pickup- coil where the PLL locks-on.

I tested the pickup circuit with a AC signal from my signal generator going into the pickup circuit. I have pulse from the opamp in phase with the AC voltage, but it has a lot of noise in/on it. The lock-on circuit response on this is not good!:huh:

In my video you can see the scanner active (yellow) and the pickup pulse(blue) from the AC voltage from signal generator at 2kHz.

I want the PLL to lock-on the AC voltage. (pickup coil simulation)

https://www.youtube.com/watch?v=gRYf8nZ2Qt8

Br,
Webmug

Good work, the feed back signail is a square wave. Not a sign wave, so try the square wave. Seems everyone has that sig gen! Lol I find that funny! It's a good one! But my Chanel one is out! Hope the warrantee is good...

Thanks
~Russ

Hi,

I'm testing my driver circuit again...:cool:

https://www.youtube.com/watch?v=bf_r8j_ViWQ

First yellow signal is from the TIP120 transistor.
Then the yellow signal is from the PLL and the blue one is pickup from the TIP120 (primary connection tap) scanner active.

There is a 2N3906 transistor Q8 (Fig.5 WO 92/07861) that altered the duty cycle 50% from the PLL to 36% from the collector pin.

Could be a damaged transistor or resistors have wrong values, should I replace it?

Any ideas how to solve this?

Br,
Webmug

Hi,

Need help!

Did someone test the driver circuit properly?

I can't get it to work, no signal at Pin#7 !!!:huh:
With the resistor values from Dynodon I can not get it to work.

Br,
Webmug

Quote from Webmug on April 27th, 2012, 08:18 AM

Hi,

Need help!

Did someone test the driver circuit properly?

I can't get it to work, no signal at Pin#7 !!!:huh:
With the resistor values from Dynodon I can not get it to work.

Br,
Webmug

No, I have not tested the circuit. What I can tell you is that you have to trace the pulse train from left to right. each transistor/darlington must be biased properly. this is the case when pulse train propagates thru the transistor stage.

one resistor labeled N/A may be the candidate for trouble in your circuit.

the whole circuit is too complex without need. state of the art components with Mosfet and driver would make no problems at all. there is no need to replicate 20 years old circuity when there are modern alternatives ...

Quote from Webmug on April 26th, 2012, 02:24 PM

Quote from ~Russ/Rwg42985 on March 26th, 2012, 11:28 AM

Quote from Webmug on March 26th, 2012, 10:12 AM

Quote from ~Russ/Rwg42985 on March 26th, 2012, 08:27 AM

Also. I think i want to redue the adjustable power schmatic. It will get more complacated but that's ok. I don't like the way it is now.

Webmug,

Can you post your schmatic of what you have done with this part of the schmatic.

I know your using a sig gen to get the duty cycle but we will use a 555 timer or somthing in the final set...

Thanks all! ~Russ

Yes, you can do this also. Takes a couple of more components. :) It works in combination with the "cell driver circuit".

The input J should have a adjustable duty cycle DU pulse 0 to 5V and frequency about 1kHz. This 1 to 99% DU controls the voltage amplitude.
You can do this with a 555 timer instead of a signal generator.

Offset is the min. voltage amplitude on the primary coil and gain the time it takes to go to max voltage amplitude, when you set it to 1%

This voltage amplitude control has a useful function, because it adjust the voltage "analog" and not in increment steps what disturbs the voltage.

I have problems keeping the DU signal 50% from the "cell driver circuit" when the PLL adjust frequency (scanner). 31 to 42% This is very important because this 50% gives us perfect resonance and is picked-up at the pickup- coil where the PLL locks-on.

I tested the pickup circuit with a AC signal from my signal generator going into the pickup circuit. I have pulse from the opamp in phase with the AC voltage, but it has a lot of noise in/on it. The lock-on circuit response on this is not good!:huh:

In my video you can see the scanner active (yellow) and the pickup pulse(blue) from the AC voltage from signal generator at 2kHz.

I want the PLL to lock-on the AC voltage. (pickup coil simulation)

https://www.youtube.com/watch?v=gRYf8nZ2Qt8

Br,
Webmug

Good work, the feed back signail is a square wave. Not a sign wave, so try the square wave. Seems everyone has that sig gen! Lol I find that funny! It's a good one! But my Chanel one is out! Hope the warrantee is good...

Thanks
~Russ

Hi,

I'm testing my driver circuit again...:cool:

https://www.youtube.com/watch?v=bf_r8j_ViWQ

First yellow signal is from the TIP120 transistor.
Then the yellow signal is from the PLL and the blue one is pickup from the TIP120 (primary connection tap) scanner active.

There is a 2N3906 transistor Q8 (Fig.5 WO 92/07861) that altered the duty cycle 50% from the PLL to 36% from the collector pin.

Could be a damaged transistor or resistors have wrong values, should I replace it?

Any ideas how to solve this?

Br,
Webmug

change in duty cycle may be due to wrong bias for Q8. so it´s base resistors seem to be wrong values.

Quote from bussi04 on April 27th, 2012, 09:20 AM

Quote from Webmug on April 27th, 2012, 08:18 AM

Hi,

Need help!

Did someone test the driver circuit properly?

I can't get it to work, no signal at Pin#7 !!!:huh:
With the resistor values from Dynodon I can not get it to work.

Br,
Webmug

No, I have not tested the circuit. What I can tell you is that you have to trace the pulse train from left to right. each transistor/darlington must be biased properly. this is the case when pulse train propagates thru the transistor stage.

one resistor labeled N/A may be the candidate for trouble in your circuit.

the whole circuit is too complex without need. state of the art components with Mosfet and driver would make no problems at all. there is no need to replicate 20 years old circuity when there are modern alternatives ...

Hi bussi04,

Yes, trace left to right...:)

I'm not going to argue with you and others on this 20 years old circuity question.:D

I feel sorry for all the persons who change the specs or components and think it's better and still want to replicate the electronic circuit workings and later complain about none or different working circuits... and wonder why it won't work!!!!

Best thing to do is stick to the exact specifications from Stan his original VIC circuit.

If we have this working, then we can improve the circuit.
Sure it can be all done in a micro controller!

My question is how this circuit works and it has to do with the bias settings at the transistors...

The primary coil wire (30 AWG) should not get high current so the input to the base of the TIP120 should be biased on a maximum.

Stan used a 2N2222 (Ic 800 mA) and two 2N3906 (Ic 200 mA) transistors. The 4046 PLL is powered by 12V and pulsing at the resistor input network to the base of the 2N3906 (emitter 12V) etc.

One resistor labeled N/A was not connected in the VIC circuit pcb.

Br,
Webmug

Quote from Webmug on April 27th, 2012, 09:44 AM

Quote from bussi04 on April 27th, 2012, 09:20 AM

Quote from Webmug on April 27th, 2012, 08:18 AM

Hi,

Need help!

Did someone test the driver circuit properly?

I can't get it to work, no signal at Pin#7 !!!:huh:
With the resistor values from Dynodon I can not get it to work.

Br,
Webmug

No, I have not tested the circuit. What I can tell you is that you have to trace the pulse train from left to right. each transistor/darlington must be biased properly. this is the case when pulse train propagates thru the transistor stage.

one resistor labeled N/A may be the candidate for trouble in your circuit.

the whole circuit is too complex without need. state of the art components with Mosfet and driver would make no problems at all. there is no need to replicate 20 years old circuity when there are modern alternatives ...

Hi bussi04,

Yes, trace left to right...:)

I'm not going to argue with you and others on this 20 years old circuity question.:D

I feel sorry for all the persons who change the specs or components and think it's better and still want to replicate the electronic circuit workings and later complain about none or different working circuits... and wonder why it won't work!!!!

Best thing to do is stick to the exact specifications from Stan his original VIC circuit.

If we have this working, then we can improve the circuit.
Sure it can be all done in a micro controller!

My question is how this circuit works and it has to do with the bias settings at the transistors...

The primary coil wire (30 AWG) should not get high current so the input to the base of the TIP120 should be biased on a maximum.

Stan used a 2N2222 (Ic 800 mA) and two 2N3906 (Ic 200 mA) transistors. The 4046 PLL is powered by 12V and pulsing at the resistor input network to the base of the 2N3906 (emitter 12V) etc.

One resistor labeled N/A was not connected in the VIC circuit pcb.

Br,
Webmug

I also will not argue about that. I only want to show an easier way going ...

why?
those transistor chains must be calculated by datasheet parameters for a given supply voltage. amp factor and base current issues for the specific transistor let you then calculate proper bias for each individual transistor. a transistor can be used in switching mode or in analog amplification mode. wrong calculations will lead to heating up the device.changes in supply voltage needs to recalculate the values.
 
if nobody here can properly calculate the resistance values for transistors needed you should not use those components. for sure Stan Meyer had them calculated correctly and therefore working as designed.

using present digital components is much easier because there is little need for those calculations. but to calculate i.e. RC stages used in Meyers design needs them be calculated. otherwise there is no frequency to voltage conversion as done in Meyer´s devices.

Quote from bussi04 on April 27th, 2012, 11:43 AM

I also will not argue about that. I only want to show an easier way going ...

why?
those transistor chains must be calculated by datasheet parameters for a given supply voltage. amp factor and base current issues for the specific transistor let you then calculate proper bias for each individual transistor. a transistor can be used in switching mode or in analog amplification mode. wrong calculations will lead to heating up the device.changes in supply voltage needs to recalculate the values.
 
if nobody here can properly calculate the resistance values for transistors needed you should not use those components. for sure Stan Meyer had them calculated correctly and therefore working as designed.

using present digital components is much easier because there is little need for those calculations. but to calculate i.e. RC stages used in Meyers design needs them be calculated. otherwise there is no frequency to voltage conversion as done in Meyer´s devices.

I like a challenge, didn't say it would be easy to get it to work! :D

Why not use those components?
I think the transistors are biased in the "On saturate state".

Supply voltage is regulated.
All the component specs are in the data sheets available.

Just wanted to know if someone had tested this driver circuit properly!

Thanks for the reply!

Br,
Webmug

Hi,

If someone want to help calculating the resistors values, setting them in "on saturate state" check this link.
http://www.ermicro.com/blog/?p=423

DATASHEETS

Keep the power supply 12V for all components and use approximately 12V for TIP120 input (should also be adjustable 1V to 12V) and 220ohms resistor parallel to the primary coil (10.5ohms).

TIP120
http://www.learn-c.com/tip120.pdf

CD4046
http://www.ti.com/lit/ds/symlink/cd4046b.pdf

2N3906
http://www.onsemi.com/pub_link/Collateral/2N3906-D.PDF

2N3904
http://www.oup.com/us/pdf/microcircuits/students/bjt/2n3904-st.pdf

equivalent to

2N2222
http://www.stanford.edu/class/ee133/datasheets/2n2222.pdf

Check for: Vce(sat), Vbe(sat), hFE
Not all manufactures have the same voltages!
For most transistors in general we can use Vbe = 0.7 Volt (should be saturate) and Vce = 0 Volt.

Br,
Webmug

very interesting post thank you , this will help

Dan

Quote from securesupplies on April 27th, 2012, 01:23 PM

very interesting post thank you , this will help

Dan

Hi securesupplies,

Yes, as we can see using the same type of transistor doesn't mean it works!

We must check the manufacturer specs for the type used and calculate the resistors for it.

You can not use all manufacturer types for this driver circuit.
Should do the same for other components.

Br,
Webmug