Bargraph tachometer (CB7378E)

This analog tachometer was found in Radio Electronics from the 90s. The components used can still be found with some ease.

| Clique na imagem para ampliar |

3 to 20 MHz Short Wave Receiver (CB16784E)
This circuit was found in a 1994 publication. It can receive signals from the 3 to 20 MHz band,...
Transistor Test (CB10984E)
This circuit was obtained in a 1978 English magazine. This circuit is one of many that the reader...
Flip-Flop Operational (CB15645E)
With two operational amplifiers it is possible to make a flip-flop type R-S (Reset-Set), as shown...