27 MHz Oscillator (CB24983E)

This tunnel diode oscillator was found in July 1986, Radio Electronics magazine. Note the low supply voltage.

Negative Voltage Generator (CB16629E)
This is another possible version of a negative voltage generator using a 555 integrated circuit. The...
Timer (CB12979E)
This timer activates a relay after a time interval of up to 15 minutes has elapsed, starting from...
Motor Speed Regulator TDA1511 2 (CB15218E)
This circuit was used to regulate the speed of small DC motors of cassette recorders. However, if the...