3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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Audio Visual Thermometer (CB18469E)
This circuit was found in a 1974 publication. It provides a tone indication of the temperature sensed by...
DC Motor Speed Control (CB17401E)
This is a simple rheostat circuit for motor control that works with voltages from 6 to 12 V. The...
1 MHz Colpitts Clock (CB6469E)
This circuit with TTL compatible output was found in a 1968 US documentation. The circuit is...