Avalanche Oscillator (CB7112E)

Found in a General Electric documentation from 1970, this circuit consists of a relaxation oscillator that uses a transistor from that time.

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Voltage Regulator LM3900 (CB5044E)
In the figure we have the use of one of the four existing amplifiers in the LM2900 and LM3900 as a...
Water Level Alarm (CB13962E)
This circuit also detects leaks and rain. I found it in a 1967 English magazine, but it can be...
Temperature Alarm (CB6111E)
This circuit is from a 1965 General Electric publication. It uses a thermistor to fire a reed...