HJW Electronics

14/02/2026

It's not that I really *enjoyed* irritating people at work, but Yes. XMAS XOR LFSR?

A description and electronics schematic diagram of how to make a linear feedback shift register for flashing Christmas lights in an annoying fashion and creating a Geiger counter sound effect or white noise.

13/02/2026

Updated Pearoast. Yay! But just look at the linear interpolator and HF oscillator on that thing, Doctor!

How to make a graphical waveform VCO for use in modular synthesisers including an interesting analog linear interpolator.

10/02/2026

Did anyone order a Roasted Pea? With TBUs the only thing to fear is fear itself.

The technical details, pictures, and schematics for a twin line TBU telebalance unit made for Radio Glen at Southampton University and subsequently used at the SURGE studios in the students union building.

10/02/2026

It's not a pearoast if it's been twenty-five years, and it's still going.

A description of how to make some transmission line speaker enclosures from furniture board and wide range drivers loosely based on a Babani book by V. Capel

09/02/2026

Is it a 20 y.o. pointless pearoast, or is it an update? Only You can decide:)

This page shows how I arranged my modular synthsizer modules back in 2005 and there is an update showing how to do this rather neatly using a cheap second-hand modern sideboard bought from a charity shop.

06/02/2026

Even more pointless links to pattern.usefulcomponents.com, hidden so well by Meta/groogle that no-one in the entire world can see it:)

https://pattern.usefulcomponents.com/listing/1306417590/5-127mm-long-65mm-diameter-ferrite-rod

This is a used ferrite rod aerial recovered from a valve / tube radio with MW and LW coils.This item is only available on the Pattern website; Checkout is via the Etsy system. If you would like to buy *any* additional item in the shop, discount codes are available for use within shopping cart at t

06/02/2026

Pointless link to Hetsy Betsy so that the robots see it.

This Parts item by HJWElectronics has 4 favourites from Etsy shoppers. Dispatched from United Kingdom. Listed on 24 Dec, 2025

06/02/2026

So if you want to create authentic reggae or Barbarella movie reverberation sound effects, groogle doesn't think this page worthy of indexing. I wonder why?

https://www.interestingelectronics.com/old/henrys_interesting_electronics/spring_reverb/spring_reverb.htm

04/02/2026

What? Your 25 year-old 12V solar panel on top of the caravan has finally given up the ghost? Fetch the Volvo Val! Or fear not, for here is a method of repairing it. Lower down the freshly updated page there is, anyway:)

A 12V Solar Battery Charge Regulator With Auxilliary Load Output To Usefully Use Spare Power Generation, For Example To Run A Camping Refrigerator

02/02/2026

Wow, an mp4 video made on a Nokia N78 that's so old, it won't even show. Fab-bo! I like the oscillating air triode idea though:)

https://www.interestingelectronics.com/old/henrys_interesting_electronics/rotating_air_ioniser/rotating_air_ioniser.htm

02/02/2026

Take two updated interestingelectronics pages into the shower? Well, Sorry yes, I had to. Separately. One after the other.

https://www.interestingelectronics.com/old/henrys_interesting_electronics/ringmod_dalek/ringmod_dalek.html

30/01/2026

On this updated page last attended to in 2003, I particularly like the audio samples of Aldershot Garrison Radio on 1287 kHz AM with Dozy Griffiths doing The News.

How to make a DIY superheterodyne AM radio like those you buy, winding all your own coils and intermediate frequency transformers.