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Topic:

Electronics

8 posts
Aug 2010 – Sep 2024

Faking the fan rotor lock signal in a Tripp Lite SU1000RTXLCD2U UPS

For Reasons[1], I needed[2] to connect my refrigerator to a double-conversion UPS so it receives good, clean power regardless of what’s coming from the wall outlet. In my case, this power could be from the local electric utility or from an onsite natural gas generator. I found …

Improved low-battery shutoff for my DIY Ego-powered 12V supply

I fixed an issue with the low-battery shutoff circuit in my DIY Ego 12v power supply by replacing discrete logic with latching logic in an Arduino.

Fixing Ego batteries in a low-voltage "defective" state

This is a bad idea, but it did seem to work.

The 12v portable power supply Ego needs to make

Part of the Project Logs series. I'm fully invested in the Ego line of power tools for everything from my lawnmower to hedge trimmer. I also have a need for a portable, long-lasting, rechargeable, power-outage-resistant, 12 volt power supply.[1] Ego sells several inverters/converters, but they all …

Automated generator load-shedding for the house

Another recent house-related problem, and a solution. My house has an old 7 kW natural gas generator. During a power outage, it makes sure the house still has heat and running water, and it also powers some lights and outlets in the bedroom, office, and kitchen. The "office" …

TDS220 Oscilloscope Refurbishment: Rotary Encoders & Backlight

Part of the Project Logs series. For years, my oscilloscope has been a Tektronix TDS220 (2-channel, 100 MHz) scope. I bought it used, fairly inexpensively, a little while after graduating from college. (You'll see some photos of this scope's screen in my atomic clock project post. …

Capturing Lightning

Building an analog circuit to trigger a DSLR camera when it detected lightning.

Datasheet for RadioShack Phototransistor

Datasheet and other information for RadioShack phototransistor, part number 276-0145.