Archive for the ‘Building projects and kits’ Category:

2024-03-24 Signal Distortion From High-K Ceramic Capacitors

A good article about signal distortion in a Butterworth low pass opamp filter using C0G and X7R MLCCs.  https://www.edn.com/signal-distortion-from-high-k-ceramic-capacitors/

2024-03-22 USB Power Delivery Trigger Adapter

Some important information for those who wish to power their projects with a USB C “power delivery” adapter.  You may need one of these. This is a YouTube short video.

2024-03-11 Flexible LED Filaments

Some information on what current and resistors to use.  The LEDs are all in parallel and need about 3 Volts, current limited with a resistor. https://www.facebook.com/reel/909951727389682?mibextid=9drbnH&s=yWDuG2&fs=e

2024-03-10 Radio Shack P-Box List, Assembly Manual, Schematic Info

This seems to be pretty much all of the kits. http://my.core.com/~sparktron/pbox.html

2024-03-09 Big Clive’s Old Tungsten Roadwork Beacon – Barricade Flasher

I built this “tungsten roadwork beacon” as Clive calls it, using the parts given in my schematic (photo below). I didn’t have a 6V, 90 mA lamp, so I simulated it by using three 20 ohm, 1/4 Watt resistors in series, which gives 60 ohms and 100 mA load with 6VDC.  For an indicator I

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2024-03-08 Some Rube Goldberg Inventions That Could Make Some Cool Projects

Mostly wood.  Short video. https://www.facebook.com/reel/1099537448068091?mibextid=9drbnH&s=yWDuG2&fs=e

2024-03-08 FWBR Ripple Calculator Online

This may be helpful when choosing the amount of capacitance for a certain unregulated AC power supply – the kind that uses an old fashioned transformer.  It calculates one variable given the others. https://www.chipbuilder.com/full-wave-power-supply-ripple-calculator.html

2024-04-06 The Flexible LED Filament

This YouTube short demos a flexible LED filament and shows how to configure it for 5VDC.

2024-03-01 Innovative Dome Shaped Homes In S. Dakota

Dome shaped homes use cellular concrete 20% with 80% air, which makes it a good insulator.  In the Pine Ridge Reservation in S. Dakota.  They founded “In Our Hands” non-profit.  Short video. https://www.facebook.com/reel/1889790898142946?mibextid=9drbnH&s=yWDuG2&fs=e

2024-02-22 Building A LiFePO4 Battery

A YouTube short of a 12V 315Ah LiFePO4 battery being assembled. I wish I could find out what the background music is.

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