Regenerative receiver (CB20513E)

We found this receiver in old documentation. The transistor is made of germanium and the headphones must be of high impedance.

555 Triggered Astable (CB1469E )
This circuit is from a cookbook to timers. The circuit is triggered by an external signal and,...
M204 Audio Preamplifier (CB849E)
This is a general purpose pramplifier launched in Brazil by Philips in the years 70. The BC549 is...
Safety Light (CB4785E)
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...