Two Time Constant Tone Decoder (CB6200E)

This circuit is from a 1980s documentation featuring two time constants for sound decoding. The integrated circuit is not common today.

Tunnel Diode Oscillaor (CB4602E)
The circuit shown in the figure can generate signals up to 1.6 GHz. Coil L1 and capacitor C2 are...
Square Oscillator (CB4847E)
The LM2904 is not very common today, but common comparators and operationals can be used in the...
Broadcasting band amplifier (CB8404E)
Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz....