Oscillator for the medium wave range (CB21140E)

This ground-based circuit was found in 1990s American documentation. The transistor can be any general-purpose equivalent.

| Clique na imagem para ampliar |

Temperature Control (CB6003E)
This circuit functions as a thermostat triggering a relay when the boil control temperature...
Latching relay (CB25722E)
The figure shows how to connect a relay to obtain the latch effect. The circuit is from an...
Extension Bell (CB15685E)
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...