Gemanium Transistors DC Amplifier (CB14775E)

This instrumentation circuit was found in the 1960 transistor application manual. More modern transistors can be used.

Binary counter with relays (CB23779E)
This circuit uses the flip-flops from the previous circuit to implement a 3-digit binary counter. The...
Logic Level Changer (CB20388E)
The voltage comparator used in this application is the NCX2220 from NXP. What this circuit does is...
UV Sensor with UVTRON Tube (CB25942E)
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...