Square to Sinusoidal Converter (CB6595E)

This circuit was obtained in an American publication of the time. Transistors are commonly used. The circuit can be adapted for use as a shield.

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Ramp and Hold Circuit (CB14217E)
The circuit whose characteristics are given in the graph uses two transconductance operational amplifiers...
kHz Crystal Oscillator (100)
This circuit was found in the Radio Electronics magazine in an article about emitter-coupled...
Temperature Sensor (CB6022E)
This circuit was obtained from an 80s factory manual. The integrated circuits used are uncommon...