December 2020

Detailed description of this issue HERE

Projects & Circuits

Clever Controller for a Dumb Battery Charger – buy the PCB here!
Most cheap battery chargers are pretty dumb! Upgrade them with this clever controller for flooded lead-acid, SLA or even LiFePO4 rechargeable batteries.

LFSR Random Number Generator – buy the PCB here!
Using a handful of logic ICs you can digitally generate a pseudo-random number sequence. A handy circuit to have – it even works with our LED Christmas Tree.

High-Power 45V/8A Variable Linear Supply – Part 3 – buy the PCB here!
Now it’s time to finish off your supply’s case, mount the components inside, attach the front panel controls, wire it up and perform the final calibration/testing.

Series, Features and Columns

The Fox Report by Barry Fox
Smart meters – for whose benefit?

Techno Talk by Mark Nelson
Triumph or travesty?

Net Work by Alan Winstanley

The rise of the most lucrative of all electronic products – the car. From ‘joke’ to must-have purchase, the electric car is a revolution happening right now.

Building a Hi-Fi amp on the cheap by Julian Edgar

Using a salvaged amplifier is a great starting point for assembling low-cost Hi-Fi.

Circuit Surgery
Micro-Cap 12 simulator

Make it with Micromite
Part 23: Analogue inputs and servos

Max’s Cool Beans by Max The Magnificent

Flashing LEDs and drooling engineers – Part 10

Audio Out

Theremin Audio Amplifier – Part 2 – buy the PCB here!

Downloads

Download the files associated with this issue HERE.