80 W Amplifier (CB8949E)

This National Semiconductor circuit uses integrated circuits that are uncommon today. The circuit was obtained in a 90s documentation.

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Crystal Colpitts Oscillator (CB13853E)
This circuit is from the National Semiconductor 1977 FET Databook. The FET can be BF245 or MPF102...
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This tone control was obtained in the Audio Handbook of the National Semiconductor of 1977. The...