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Portable Variable Bench Power Supply 1-32V 0-5A
 
Portable Variable Bench Power Supply 1-32V 0-5A


 

Portable Variable Bench Power Supply 1-32V 0-5A

 


I have gone without a variable lab bench power supply for too long now. The power supply that I have been using to power most of my projects has been shorted out too many times. I have actually killed 2 by accident and needed a replacement. I had many 18650 lipo batteries lying around my workshop so I decided to use them to build a portable variable bench power supply that could be easily moved around and used on the go. The power supply consists of DC-DC step up power module, voltage and current display, a switch, standard size 10K trim pots, XT-60 and a balance connector for charging an array of 8x4 18650 batteries.


Portable Variable Bench Power Supply 1-32V 0-5A

3D printed 10x4 18650 battery holder was used to keep all batteries together. 2A fuses were soldered for short circuit protection. The rest of the space in the holder is used for DC-DC converter and other electronics. With eight LIPO cells 33V is the highest voltage possible for the DC-DC converter. The maximum voltage will decrease as 18650 cells are drained to about 28V, but I don't anticipate needing 33V DC very often.

The display is powered through 7812 12V voltage regulator, that can handle up to 35V max input. Finishing this up, I connected XT-60 and a balance connector to 18650 batteries so they can be easily charged up with RC battery charger. I also added some cardboard on the top and bottom to protect the fuses and avoid shorts. I printed out my logo on a label sticker page and transferred it to the top of the battery.

I have used this power supply fairly often. I would love to add a way to get coarse and fine adjustment on voltage and current levels. Right now, it takes a little time to set an accurate voltage with the tiniest of turns on the potentiometer. I might build another power supply using the same parts and use an XT-60 connector that will connect to an external lipo battery pack.


Portable Variable Bench Power Supply 1-32V 0-5A


Portable Variable Bench Power Supply 1-32V 0-5A


Portable Variable Bench Power Supply 1-32V 0-5A

Portable Variable Bench Power Supply 1-32V 0-5A





Accurate LC Meter Capacitance Inductance Meter with 16F628 and LCD
Volt Ampere Meter with 16F876 Microcontroller and LCD display
 
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Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.
PIC Volt Ampere Meter

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50MHz 60MHz Frequency Meter / Counter with 16F628 & LCD
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BA1404 HI-FI Stereo FM Transmitter
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ESR Meter / Transistor Tester Kit
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Arduino Prototype Kit
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