K8CU – Bill Jones – Radio Amateur
2022-02-18
Bill Jones, K8CU, has been an active Radio Amateur, CW Dxer, and home project builder since first receiving his Amateur Radio license in 1966 at age 17. Bill is anRead More
555 multivibrator like power oscillator
2019-09-06
This is dual 555 multivibrator like power oscillator. This is my contraption and conception but couple of decades old. It appears to have errors. It worked but the document fixingRead More
Facts of EMI and RFI from the Inside
2018-06-25
Electromagnetic interference (or EMI, also called radio-frequency interference or RFI when in radio frequency) is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emittedRead More
PCB SSR Module – IO Module
2018-01-24
This is a PCB Mount SSR for Control of a Small AC load like a Lamp or a Contacter. It has Optical Isolation and has a Thyristor for output. ThisRead More
Mains Voltage and Power Circuits
2016-10-14
Mains Power means the 230 V AC 50 Hz or 110 V AC 60 Hz in some countries, The lower power line like 5A is used for small lamps andRead More
Earthing Practice by Trevor Charlton
2016-03-21
“Earth leakage currents arise mainly from the EMC filters built into electronic equipment with switched mode power supplies. Standards limit the leakage current from non-fixed equipment (i.e. equipment that plugsRead More
Energy and Power Measurements
2014-05-04
To make an analog design using log amps or multipliers, four-quad is good for learning. Using a uP for math is better. Look at these links below. Build a PowerRead More