Prototron Circuits Southwest Inc. started out humble, at least in Tucson. Parent company Prototron Circuits of Redmond, Wash., was doing work for big-name companies in the Seattle area including ...

Many electronic projects require the use of a small audio amplifier. Be it a radio transceiver, a digital voice recorder, or an intercom, they all call for an audio amp that is small, cheap, and has ...

This circuit will light a lamp at a remote location when the doorbell switch is pressed. This circuit should only be used with the solenoid type doorbells, the electronic type that play tunes will not ...