Stepper Motor Drive (CB21490E)

This circuit was found in a 1967 Electronic Design. The circuit makes use of components from the time. Modern equivalents can be used.

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Mid Treble and Bass Control (CB13201E)
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Precision Current Source (CB24752E)
Using a transconductance operational amplifier, this circuit was found in July 1983 Radio...
Electroluminescent emergency light (CB23805E)
This battery-powered emergency light circuit was published in an April 1962 Radio Electronics...