that´s an interesting circuit configuration for a scope.
of course you have checked the kit option as no longer available and now you want to build it by yourself.
http://www.pdamusician.com/dpscope/buy_it.htmlThey sell it for 59€ completely assembled plus shipping (good price I think) and you have to calculate the risk to fail by building it by yourself.
Possible failures:
- creating a bad pcb (etching, designing, wiring errors)
- using components out of tolerance (1% and 5% needed), standard components are 10%.
- using an insufficient soldering iron
To build it by yourself I suggest to take the following steps:
1. decide how to build the pcb (etching by yourself or let it be made by a company)
2. buy all components needed before you start pcb layout because those components give the dimensions needed for the pcb layout. all components are available at different dimensions. Some components as resistors can´t be purchased as single items but must be ordered bundled (i.e. in 10s).
3. create the pcb using a layout program (I use and prefer KiCad, it´s free and produces Gerber files, that way you are not bound to a specific manufacturer but a manufacturer bound layout program used somewhere else here at the forum might be advantageous).
3a. for pcb design take some basics into considerations: look at the red pcb. it´s double layer (self etching only for experienced users with adequate equipment). Most of the pcb area is filled up by grounded areas. signal lines are directed thru the grounded areas. all areas must be grounded to avoid humming. decoupling capacitors must be near the integrated circuits they are buffering.
costs consideration:
pcb manufacturing > 20 € for a single pcb 10 or 20 maybe cheaper (forum order
:-)components 1% and 5% > ? € >> 15 €
learning layouting > 2 h
layouting > 3h
order process > 1h
building the scope > 3h
test and debugging > 1h
Hope that helps for a starter
:-)