Alarm Siren (CB20327E)

This powerful siren is suitable for warning or alarm systems. The components are current and the transistor 3055 must be mounted on a good heat sink.

| Clique na imagem para ampliar |

Modulated infrared transmitter (CB7028E)
We found these circuits in a Popular Electronics from the 90s. The circuit has a simple low power...
Simple Diodes Test (CB14700E)
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...
RF Monitor (CB21686E)
This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The...