Digital accelerometer (CB21045E)

Found in Popular Electronics from the 90's, this circuit makes use of components from the time.

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Mid Treble and Bass Control (CB13201E)
This circuit was found in an old American publication. The integrated circuit used is no longer easy...
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...