Light Activated OR Gate 1 (CB5319E)

This circuit uses two light-activated SCRs or LASCRs, uncommon components today. The power depends on the load. The maximum current is low.

CMOS Digital Frequency Meter (CB4646E)
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...
Signal Injector and Tracer (CB3917E)
This signal injector and tracer (follower) was found in an old American documentation. The...
Sampling and Holding with the LM308 (CB4489E)
This circuit utilizes a precision operational amplifier that can be replaced with an equivalent. The...