Beacon with instrument (CB20495E)

This circuit causes an instrument needle to oscillate to signal an event. The circuit is powered by solar panel from 1 V.

300 kHz a10 MHz crystal oscillator (CB4054E)
This circuit can be used to generate signals from 300 kHz to 10 MHz, depending on the crystal...
Loop Antenna Tuner (CB26263E)
This circuit appeared in Amateur Radio Today in an issue and was found in a 1995 issue. The...
TTL Logic Tester (CB13785E)
We found this configuration in a 1974 technical documentation. It can test both TTL logic circuits and...