Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Photodiode Current to Voltage Converter (CB6104E)
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...
Twin-T Oscillator (CB12697E)
Twin- T oscillators can be used to produce sinusoidal signals in the audio track with good...
Active Tone Control (CB18728E)
This transistor circuit consists of a well-known bass and treble control configuration. The...