Archive for the ‘Building projects and kits’ Category:

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. http://www.coe.ufrj.br/~acmq/electrostatic.html

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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2021-02-13 Speaker Made From A Steel Sheet And Audio Output Transformer

I made one of these back in 1970 or so. It was inside of a coffee can using the lid for the speaker. This class A power LED driver works good for making a speaker from an audio output transformer and any sheet of steel, even a coffee can with a steel cover. Strip the

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2020-10-15 Irrigate With Moisture From Air

I’ve seen so many locations in Southern California that are pretty much barren mostly because the country is lacking water. The cost of water in So. Cal. is high because there are so many people that the water they need has to be imported from hundreds of miles away — as far as Northern California.

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2020-07-11 DIY Off Grid Solar System

This is a YouTube video. This guy did a very good job of building an off-grid solar system. It’s transportable, uses four 100 watt panels, two 12V AGM batteries in parallel, can supply 120VAC pure sine wave at 2000 watts and costs under $1,900. This is an excellent video with plenty of details. He calls

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2020-06-10 Dubbing Adapter

This is an adapter to connect a source such as a smartphone stereo headphone output to the input of an MP3 recorder. The view and diagram is looking at the back of the adapter where the plugs are inserted into the jacks. The switch handles are on the far side. The switch on the right

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