Colpitts CMOS Oscillator (CB22397E)

This is the basic configuration of a Colpitts LC oscillator using a CMOS gate.

MIDI Interface (CB8005E)
This circuit for musical instruments was found in a 90’s Elektor. The circuit still applies, as the...
TTL Opto Trigger (CB14670E)
This Texas Instruments circuit uses a phototransistor to fire a TTL trigger port. Other...
4W x 500kHz transmitter (CB21803E)
We found this 4W transmitter in a Mullard transistor manual from 1960. The circuit is powered by...