Posts Tagged ‘homebrew’

HP 8640b Signal Generator Gear Set Replacement

Back in April of 2016, I bid on a Hewlett Packard 8640b signal generator to upgrade my test bench at home.  This was from a local seller, and I won the bid for $115.00 + $20.00 shipping, for a total of $135.00.  I figured for that price, I couldn’t go wrong.  In working condition, these […]

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ANSR – Arizona Near Space Research work

After having taken a break for a few years, I have renewed my membership in the Arizona Near Space Research group.  This is a club that specializes in high-altitude balloon launches that carry payloads typically designed and built by students ranging from Jr. High to Post Graduate levels.  I was involved in the club shortly […]

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A 24 Volt Sealed Lead Acid Battery Charger (Part 3)

In Part 1 of this project, we covered the general design of the battery charger.  Part 2 described the physical construction of the charger.  In Part 3, we will cover the calibration and operation of the charger, and present the Arduino Nano source code for the project. Once the board was populated, I isolated the […]

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A 24 Volt Sealed Lead Acid Battery Charger (Part 2)

In Part 1, we went over the design of the 24 volt charger. In this Part 2, we will describe the physical build. At this point, I developed a PC board to hold all of the components in a solid manner.

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A 24-Volt Sealed Lead Acid Battery Charger

Recently, the battery charger inside my battery powered lawn mower died (again).  This time, I found that the printed circuit board was so rotted by moisture, that it was unrepairable.  Knowing that the rest of the mower is still in great shape, and given that this OEM charging circuit had failed several times in the […]

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