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7 Mar 2014


Andrea Biffi build a nice vertical nixie clock using ATmega8 mcu. He writes:

After the success of my first nixie clock made out from a rosewood block, I decided to lose no time and to carry on with the next one.  As some of you guys already know, or imagine, lately I’m indeed a little bit addicted to nixie-mania. I’ve bought many nixie tubes on eBay, and I experienced in electronics so to build my own high voltage power supply and then the ultimate nixie clock circuit. Digits for this clock are nice rounded and fully transparent IN-4 tubes, the same I used in the first model, but as I previously announced, I aligned them vertically, so to read from top to bottom hours, minutes, and seconds. Indeed you will see the undeniable influence of Max Pierson’s vertical clock. I guide you now through the full process to make your own unique nixie clock.

Vintage style nixie wall clock - [Link]

24 Feb 2014

3d_pcb_1_thThis project is a controller for a dual pulse spot welder that has some nice features that are controlled using a LCD interface. Hercules Trapierakis writes:

I always wanted a spot welder, so I decided to built one. I wanted to build a capacitance discharge one but I couldn’t afford for the capacitors at this time. So this is a controller for a dual pulse spot welder with some few extras:

– It has a zero cross detector. You could power the transformer at zero cross or dim the transformer if you like
– The transformer is triac controlled
– It has an hd44780 interface
– An spi interface for single thermocouple
– Peak detector of a current transformer
– Isolated foot switch
– Voltage monitor with opmaps
– An attempt to sense when the user tries to weld
– Single rotary switch for operation and single rotary encoder for setting up

MCU Controlled Spot Welder - [Link]

26 Nov 2013


T0m designed a Twin Triac AC switch on DP5050 PCB:

Double SSR for TO-220 package triacs and MOC* series optocoupled drivers. The schematic is based on a design by RobG posted to the 43oh forum.


Twin triac AC switches - [Link]

28 Jul 2013


This is an instructable for making your own PWM (Pulse Width Modulated) flyback driver!

Simple PWM Flyback driver tutorial - [Link]

23 May 2013

How to generate high voltage DC with a Cockcroft-Walton Multiplier circuit. a.k.a Cockcroft-Walton / Villard / Greinacher Cascade

EEVblog #469 – Cockcroft-Walton Multiplier - [Link]

16 Dec 2012


bleuchez.wordpress.com writes:

I’ve recently become interested in Nixie tubes.  Nixie tubes are neon filled glass tubes that contain cathodes in various shapes, numbers being the most common, and a mesh anode.  Passing a current through the cathode causes the neon gas to ionize which makes it light up.

The problem with these tubes is that they voltages of around 170V in order to ionize the gas.  Fortunately, most tubes only need a few mA which makes the supply design simpler and easy to run off a wall wart.

A low cost Nixie Tube Power Supply - [Link]

1 Aug 2012

Dual-Resonant Solid State Tesla Coil (DRSSTC). Shane writes – [via]

It’s been a long time since I built something that isn’t a robot, a motor controller, anelectric vehicle, or a multirotor. Also, the Edgerton Center Summer Engineering Workshop (responsible for the DIY Segway, BWD Scooter, Cap Kart, and tinyKart) isn’t running this year, so I feel the need to take on a summer project of my own. Inspired by the work of MITERS regulars Tyler, Daniel, Bayley, and Ggy, I’m attempting to build..

Specifically, I’m building a Dual-Resonant Solid State Tesla Coil (DRSSTC). Tesla coils generate high voltage and pretty sparks using electromagnetic induction. They’re loosely-coupled air-core transformers where the world is your output load. (Or just the toroidal “top load” and the air around the Tesla coil.) “Dual-resonant” implies that both the primary and the secondary form RLC series resonant circuits, tuned to about the same natural frequency. “Solid state” implies that the primary circuit is driven (near resonant frequency) by transistors, usually IGBTs although I will be starting with MOSFETs.

Building a Dual-Resonant Solid State Tesla Coil (DRSSTC) - [Link]

11 May 2012

www.philpem.me.uk writes:

Over the past few years, I’ve built up a few battery packs for myself and for other people. Most of them worked fine – in fact, one of the first packs I built over five years ago is still in service, working fine in a torch in the bottom of my cupboard.

The big problem with soldering to batteries is that you tend to damage the plastic separator, and the cell seals. This – as you might guess – is not a Good Thing™. In some cases, solder can splatter over the cell’s pressure relief vent. There’s a reason the datasheets make a big fuss about the vent – in an overpressure situation, the vent is used to release the excess pressure in the cell. Needless to say, blocking the vent with solder is never a good plan, unless you’re trying to get a Darwin Award, or you happen to enjoy watching your battery pack undergoing rapid, uncontrolled self-disassembly.

In industry, resistance welding is used instead of soldering. Not only are the welded joints smaller than solder blobs, but they cause less damage to the cell. The only problem is the cost of resistance welding equipment. A low-end resistance welding machine can cost upwards of GB 2,000.

The Poor Man’s Battery Tab Welder - [Link]

14 Mar 2012

Radu Motisan writes:

Here is an electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild.

The high voltage generated is not dangerous because of the low current (and power), but it will produce intense pain.

Electric Fence – 20KV pulses for perimeter defense - [Link]

10 Feb 2012

Hak8or uploaded a gallery of high voltage arc pictures. The setup was salvaged from an old CRT monitor. He suspects the flyback transformer produces around 30 kV – [via]

I found some old pictures of me playing around with a flyback, and I wanted to test out this awesome gallery thing I found, so I mushed them together, and well, here they are!

High-voltage arcs using a flyback transformer from a monitor - [Link]





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