Content for PCB

Homebrew SWR and power meter

“First of all, this SWR meter in this article is not exactly homebrew, as I based the circuit on the schematic in the excellent book Arduino Projects of Amateur Radio. Although I bought the book and respect the copyright of …

Polyphonic FM Synthesizer with STM32F031

“I’ve built a playable, MIDI capable, polyphonic FM synthesizer using an 32bit ARM Cortex M0 microcontroller and an audio codec. This was a learning experience for me. You can find the finished form of the system in following two …

Tiny Load - constant current load

“I’ve been developing myself a bench PSU, and finally reached the point where I want to apply a load to it to see how it performs. After watching Dave Jones’ excellent video and looking at a few other internet …

Vacuum Cleaning RC robot

“Hello everyone! In this instructable, I’m showing you how to DIY a Vacuum Cleaner RC Robot. Not only a Remote Controlled Vacuum Cleaner, it also includes 3D CAD, Programming, Algorithms, Mechanics, PCB CAD and Schematics. You can definitely edit …

1.6W Mono Audio Amplifier

“1.6W Mono Audio Amplifier Project is based on TDA7231, which is class AB power amplifier with a wide range of supply.”

DC Motor IR2104 H-BRIDGE

“H-Bridge has been designed around IR2104 IC from international Rectifier. The board has been made mainly for DC-Motor application. The driver can handle load up to 8-10Amps. I have tested this board with 36V DC supply . The circuit uses …

PiDP-8, a PDP-8/I Replica

“Of all the PDP-8s, the 8/I is my favourite. Alas, getting a real one is impractical: they are pretty much impossible to obtain, and just as hard to maintain once you’ve found one. But asI learned from …

100MHz frequency counter with LCD display

“This is the same as the previous frequency counter but the output is on the 16x2 LCD display.”

KiCad 4.0.0 Is Out!

“We’ve just released the long-awaited KiCad stable release, version 4.0.0! The announcement can be read on the developer’s mailing list archive. KiCad binaries will be available for download for Windows, OSX and Linux in the near …

Occam’s Microcontroller

“”Occam’s Microcontroller” is my article in the Autumn 2013 edition of the G-QRP Club’s “SPRAT” Journal - and the subsequent presentation at The G-QRP Club’s Rishworth QRP Convention, 26th October 2013 . If you read the pages …