Mini Megaphone (CB8952E)

Found in Popular Electronics' 90s, this small megaphone is based on LM386. The circuit uses a high impedance microphone.

Dynamic Microphone Preamplifier (CB858E)
This circuit is suitable for low impedance m icrophones. Gain is given by the 2M2 resistor. This...
SCR Rain or Leak Alarm (CB22097E)
This sensitive circuit was found in old documentation. The SCR can be any of the 106 series and...
Tone Control Preamplifier (CB18561E)
This preamp with several inputs using germanium transistors from the time was found in Japanese...