Driver for oscillograph (T459E)

This circuit from an old MIT documentation excites an oscillograph element, an old waveform viewer.

Selective amplifier (CB23756E)
This circuit for recognizing a frequency with a narrow range was found in Radio Electronics...
Sound level indicator (CB20737E)
Any small sound amplifier from 200mW to 1W can be used in this simple circuit. Or circuit of two...
Crystal Oscillator (CB6146E)
This Linear Technology circuit was found in a 1980s documentation. The circuit can swing up to a...