100 kHz Oscillator (CB22379E)

This is the single-sourced version of the previous oscillator. Frequency can be changed by changing C1.

Transistor Audio Oscillator (CB12375E)
This circuit is from a 1974 publication, but it can still be easily assembled today with BC548...
Driver TAA435 (CB7254E)
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
Automatic Gain Control for Recording (CB24224E)
We found this circuit for old tape recorders in the December 1972 Radio Electronics magazine. The...