This circuit is from a 1968 documentation using one of the first integrated circuits available at the time, the TAA370. The circuit is powered by 1.3 V using a 200 ohm handset.
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...
Found in a 1967 American documentation, this circuit produces a pulse with a delay that depends on the...
This fraction watt amplifier uses transistors that are still quite common in our market. The power...