Archive for the ‘Building projects and kits’ Category:

Fri 13th; Garden Light Pulses Light Off To Flasher

A neighbor moved a year and a half ago and was throwing out some beat up garden lights, so I salvaged them from the dumpster. They were pretty good ones 7 or so years ago when they were new, but the plastic was aging and brittle. I got a few solar cells and circuit boards

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2022-05-08 Audio 10 Meters Over Laser Beam

I got this idea; instead of using a microphone and preamp at the end of a twisted pair, I would build a microphone, preamp and modulate a red laser with the audio and pick up the audio about ten yards away with a light detector. Notice that it runs on two 2V photovoltaic cells in

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2022-03-02 Solder Dispensing Pen

I use this for holding solder while I hold the PCB and iron with my hands. I use my teeth to hold this pen.

2022-02-21 Fab Lab Or GigaFactory? Or Both

Fab Lab = fabrication laboratory Do It Yourself.

2021-12-06 MP3 Player To FM Radio Link (Mono)

MP3 Player To FM Radio Link (Mono) This circuit allows you to play your MP3 or any stereo audio source into a mono signal for reception on an FM radio. It has no antenna and has a range of a dozen or so meters. It operates off a 6 volt rechargeable Ni-MH battery pack but

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2021-11-27 Electrostatic Machines Website

This website has a huge amount of electrostatic machine projects. Wimshurst, electrophorus, Van De Graaf, and much more.

2021-11-23 Replace Germanium With Silicon Transistors

I also remember those projects that used the CK722 and 2N107. The last few years I have been repairing older transistor radios with germanium transistors. I have had a few of them with bad germanium output transistors, and I’ve replaced them with silicon PNP transistors, along with a change in base bias resistors. They work

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2021-11-07 Wood Gasifier Runs Generator

This 17 minute video shows a homemade wood gasifier that puts out enough gas to run a small generator. This is his second version with some improvements. The gasifier can use wood chips, sawdust, leaves, paper, etc., but he is using wood pellets which are already dry. The gasifier produces syngas when wood is pyrolyzed

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2021-08-14 Assembling Surface Mount PC Boards

EWWW!! Yeah, that’s what I, too, thought a few years ago. But I thought, am I going to treat SMDs as an insurmountable obstacle the next time I want to repair a board? So I saw some SMD practice boards on eBay, and bought a few. I watched a few videos on YouTube to get

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2021-02-28 3 kW Solar + LiFe Battery For Under $3000

This is the kind of setup I would like to have. I would use it to run my heat pump / air conditioner and maybe a few other things like the microwave oven. And it would be used for charging my EV when it’s at home. The two solar PV panels are 800 watts total.

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