This circuit, very critical due to the frequency at which it operates, was found in an American documentation that uses a resonant cavity in a beer can. The transistor can be of any type for RF.
The figure shows how to obtain a locking relay for an alarm circuit with sensors in series and in...
This TTL counter was found in the March 1991 issue of Radio Electronics magazine. The circuit is...
The presented circuit uses two old germanium transistors. We found this configuration in a...