Logic test with sound (CB25389E)

This circuit has visual and audible status indication using an oscillator. The circuit is from a Radio Electronics magazine from June 1991.

| Clique na imagem para ampliar |

100 and 400 MHz amplifier (CB10062E)
Depending on the components, given in the table, this circuit can amplify signals of 100 MHz or...
Remote Lamp Driver (CB6695E)
Found in a 1969 documentation this circuit shows how it uses SCRs and transistors to selectively...
Voyager Transmitter (CB21878E)
Found in an Australian documentation from 1991, this circuit was sold in a kit at the time. It is a...