Electrical construction – The PA3CSG website

FET switch with PTT and alarm inputs

14/02/2017 graat 0

A FET switch to work together with the Arduino PWR / SWR meter and controllable by the PTT is published here. The FET is a […]

Sequencer

29/08/2010 graat 0

Sequencer. Yet another design of a sequencer, very doubtful if needed but this one has SOME features never to forget: 1. Unlimited current on […]

Modification of the HP DPS-700CB A

16/03/2017 graat 0

These HP power supplies come from the server market and are able to produce a nice 65 amps at 12V. Point is that the 12V […]

Solid State Amplifier Protection Circuit

22/10/2010 graat 0

Presented here is a article published at the 2010 EME conference describing a Solid State Amplifier Protection circuit. It incorporates 4 current protection circuits, overdrive, […]

Simple Rotor schematic for AC motors

20/09/2020 graat 0

After 25 years my dish needed a new control box for the rotators, the old one was rather worn out. I kept the same AC […]

12V to +10 & -5V

19/04/2023 graat 0

In order to run my 10 GHz station from a single 12V supply I needed a positive and a negative power supply. Well everything comes […]