5 to 200 seconds timer (CB21401E)

This circuit was found in a 1967 RCA documentation. The semiconductor components are from the time, and modern equivalents can be tried.

| Clique na imagem para ampliar |

Broadband Balanced Mixer MC1556G (CB14563E)
We found this circuit in Motorola's Linear Databook in 1990. The integrated circuit used is no...
Car Reminder (CB15062E)
This circuit emits an alert sound (interval beeps) if the car lights are left on and the ignition key...
Varicap Controlled Oscillator (CIR819E)
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...