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Kerry D. Wong

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Dual Purpose Spot Welder With Pulse Duration Control

June 18, 2017 kwong

I had wanted to make a spot welder for a while. Most of the DIY spot welders use a momentary […]

Electronics 555, BTA41, MOC3061, Spot Welder, Tab Welder, TRIAC

Datum/Symmetricom 8040 Rubidium Standard Modifications

March 11, 2017 kwong

Last time, I did a teardown of the Datum 8040 Rudidium standard. As I discussed, the 8040 has a 1PPS […]

Electronics 555, 74HC123, 8040, Datum, monostable, Multivibrator, Symmetricom

Hacking Your Mouse for Rapid Firing

December 24, 2016 kwong

In this blog post, I will show you a simple hardware hack to make your mouse capable of rapid firing […]

Electronics 555, Continuous Click, Hack, Mod, Mouse, Rapid Firing

VFD Filament Driver Using 555

June 5, 2013June 13, 2013 kwong

I recently salvaged a vacuum fluorescent display (VFD) from a piece of old test gear. The VFD is a 13 […]

Electronics 13-MT-54NA, 555, Filament Driver, Vacuum Fluorescent Display, VFD

Advanced Slave Camera Flash Controller

November 23, 2012 kwong

Simple slave camera flash (or synchronous flash, like this one I built earlier) works great with older film cameras, but […]

Electronics 555, Camera Flash, IGBT, LM339, Pre-flash, SCR

Digital Metronome — Revisited

June 21, 2012 kwong

Last year, I wrote about a simple digital metronome project. While the device worked pretty well there are a few […]

AVR/Arduino 555, 7 Segment, 74HC595, Arduino, Atmega328P, Metronome
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