This is a small PCB project based on Ray Wilson’s Music From Outer Space VBE Matching schematics.
At some point I got tired recreating this useful tool on a bread board every time I need to match transistors for VCO or VCF expo converters. It helps to measure Vbe for PNP and NPN transistors using your high precision bench multimeter.
Eagle .sch/.brd files are available here.
Schematics in PDF format.
Most of the components are very generic. I’ve used the following parts:
Digikey part LM4040DIZ-10.0.
The NPN/PNP switch is SSA12 from TE Connectivity, DigiKey part 450-1602-ND.
For EBCE connector you can use any DIP8 socket, however I used 2 x 4pin headers with golden connectors from unknown source.