LEAP#465 Mr BiJuT

Mr BiJuT is what I’m calling my freeform realisation of a simple NPN/PNP transistor testing circuit.

This is a nifty little design that I found in the Radio and Electronics Cookbook. It is one of those circuits that is the height of simplicity but is also quite tricky in it’s own way! Whether you immediately “get” how it works depends very much on how you draw the schematic;-)

As always, all notes, schematics and code (more...)

LEAP#461 The Goblin

I remember lusting after an Ibanez Tube Screamer back in the day - they really were the stuff of legend. The most famous is perhaps the TS-808. After researching the original circuit and examining how it works in detail. I decided to build one with only a few modifications to the original circuit. I’m calling it The Goblin, owing to the custom stippled-green paint job I gave the 1590B enclosure.

As always, all notes, schematics (more...)

LEAP#460 The CANary

Wilf’s Bird is a pretty famous “bird chirp” sound effect by Wilf Rigter. I last saw it used in Kelly Heaton’s wonderful bird sculpture, a Hackaday Circuit Sculpture contest winner.

The CANary is my little experiment with the sound effect.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub


LEAP#456 Pease-out Audio Voltage Probe

The Boldport Pease-out is another tribute to Bob Pease and the classic LM331. As the last of the “classic series” monthly projects, it fittingly takes us full circle to compare and contrast with first project - “Pease”.

the Boldport Club continues - just not at the harrowing pace of 1 a month for the past few years (I seriously don’t know how Saar does it!).

The standard circuit in this kit demonstrates a stable (more...)

LEAP#451 Arc Lighter

A “High Voltage Arc Kit” perhaps attracts the kind of person liable to make it go up in smoke, which is probably why this kit ships with redundant parts.

The circuit is an interesting demonstration of a step-up transformer using a feedback winding to control the main power circuit. It is the same circuit used in commercial “plasma lighters”, confirmed by another great teardown by bigclivedotcom.

As always, all notes, schematics and code are in (more...)

LEAP#449 Parrot Sound Effects

The Parrot is a reproduction of a “bird chirp” circuit I found referenced in background research materials for Kelly Heaton’s amazing bird that was one of the Hackaday Circuit Sculpture contest winners.

This circuit is an interesting combination of two LC elements - one modulating the other - around a single transistor.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub


Here’s a clip from the (more...)

LEAP#447 Measuring Capacitance with Digital Logic

Capaci-meter is a Boldport remix of a classic capacitance measurement circuit designed in high school by Jez Siddons of Peak Electronic Design.

The device takes a very interesting approach - rather than trying to measure the actual capacitance or charge time, it uses a derivitive function (the capacitor’s effect on the frequency of a 555 timer) to infer capacitance.

As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo (more...)

LEAP#446 RGB Joule Thief Night Light

I recently got hold of some 5mm RGB Flashing LEDs from a seller on aliexpress - some slow and fast flashing varieties just out of curiosity. Here I’ve put one the slow-flash kind in a “night light” circuit.

I decided to power from a little 1.5V CR1216 coin cell. To boost the voltage sufficient to power the LED, I’ve attached a toroidal joule thief circuit. The oscillating voltage produced by the joule thief is (more...)