Category Archive Printed Circuit Boards & Custom Electronics

ByJohn Wuethrich

Car Key Transponder/RFID/Chip Key fried by Inverter Welder?

I’m relatively sure that I managed to fry a car key transponder (RFID tag) with a wirefeed welder.

A friend of mine was welding with his  harborfreight titanium 125 about 3ft from where my car keys sat and the next day I ended up stranded at a kwik trip station.  my ford fusion 2007 was rejecting the only key I had at the time.

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ByJohn Wuethrich

Uv Lithography Exposure Box

This is the vacuum pull down uv lithography rig i came up with a few years ago when I desired to etch PCBs of my own design. The Emitter is best shown in the “wood lamp” it later became (see yellow lantern)

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ByJohn Wuethrich

Resistive Spot Welder

Power Mosfets and a Bank of Maxwell Ultracaps Create a Powerfull Capacitive Discharge Resistive Spot Welder.

Version 1

I set out to build a Resistive Spot welder that could possibly even weld copper. not sure if it will or not as this capacitive discharge welder is back burnnnered at the moment. I wish i had got to test the jig.

this MOSFET switched capacitive discharge resistive spot welder project was intended for my use to allow assembly of quality lithium-ion packs from well-matched cells with reliable cell to cell welds.

Resistive Spot Welder 1
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