Small phonographic amplifier (T1547E)

This small 1W turntable amplifier was found in the 1975 RCA tube manual. It is a commercial circuit at the time.

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Phase shift oscillator (CB20438E)
This circuit has a common configuration widely used in projects on this site. The transistor is...
Handbook of Electronics Formulas and Calculations - Volume 1
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Locking Touch Switch (CB1523E)
We find this circuit in an American publication of 1978. The integrated circuit is the CMOS 4013...