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SWR Meter Circuits #01
For Everyone involved with radio transmitters needs some instruments to assess basic antenna functionality. Among these instruments, the best-known and most-used one is the Standing Wave Ratio meter. Some radio amateurs develop a cult for these littl...
Variable DC Power Supply 5-15V
This is a variable DC power supply that is similar I used to power my FM Transmitter. After suffering long problems with mains hum, this design using a pi filtered C-L-C approach. This circuit offers excellent ripple rejection. See at the above sc...
Uninterruptible Alarm Power Supply
Although this Power Supply was designed for the Modular Burglar Alarm - it has other applications. It provides an output of 12-volts - at a current of up to 1-amp. In the event of a mains failure - the back-up battery takes over immediately. And when...
24 VDC Power Supply with maximum Current 5 A
Here's a 24 VDC power supply circuit with voltage input 20-30 Vcc. This power supply produces voltage output 13.5 VDC maximum current 5A. The features capability of this 24 VDC power supply are protection against short circuit current, over temperat...
Simple Rain Detector
Here's a simple rain detector circuit. It uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a securit...
Coil Coupled Metal Detector
Another metal detector circuit where coils overlap to produce tone. Position out of phase on search head. It is based on a standard transformer coupled oscillator (TCO) - hence the name Coil Coupled Operation (CCO) Metal Detector. Although requiring ...

