Two-tube regenerative receiver (T1595E)

This circuit is from a Radio Electronics from 1949. The circuit is battery powered and has high impedance listening.

1kHz Double T Oscillator with the 741 (CB11884E)
This double T oscillator configuration can employ operational diamonds and the symmetrical supply...
20 Hz to 20 kHz Sinusoidal Generator (CB19206E)
We found this interesting transistor generator in European documentation from the 1980s. The...
Negative Feedback Stage (CB6131E)
This circuit is from a 1967 US publication. The configuration can serve as a basis for designs...