swatson144
08-22-2006, 06:19 PM
I find myself needing a good regulated LV power supply fairly often, but not often enough to buy one.
I had come across the very nice little Ti PTN78020W switching voltage regulator module, but by the time you add components to make it a BEC you'd have one the size of a 60A ESC. So they sat around some.
The other day I was wanting to test the alarm cut in voltages of some home made lipo alarms and was trying to figure out regulate the voltage down so I could see what was happening with them. I just stuck the module together with a handfull of components IAW the info sheet and in place of the set resistor I put a 100K 10 turn pot. I can now get a very accurate voltage between 3 volts and 12V @ 6A.
It's all mounted on perf board and covered in heat shrink. Works great for a proto.
I'll probably get a little fancier with the next one and put it in a small cabinet and add a selector switch for 5V, 6V, 12v, and variable. Probably mount up a couple 4$ harbor fright DVMs like the one pictured one showing 0-20V and the other 0-10A.
It's setup to use a JST connector for 0-30V dc in (but my caps are 24v which is no problem because it's likely to run on a 12V wall wart, charging stations PS etc). I'll switch to deans sometime.
Pretty handy for 20$
I had come across the very nice little Ti PTN78020W switching voltage regulator module, but by the time you add components to make it a BEC you'd have one the size of a 60A ESC. So they sat around some.
The other day I was wanting to test the alarm cut in voltages of some home made lipo alarms and was trying to figure out regulate the voltage down so I could see what was happening with them. I just stuck the module together with a handfull of components IAW the info sheet and in place of the set resistor I put a 100K 10 turn pot. I can now get a very accurate voltage between 3 volts and 12V @ 6A.
It's all mounted on perf board and covered in heat shrink. Works great for a proto.
I'll probably get a little fancier with the next one and put it in a small cabinet and add a selector switch for 5V, 6V, 12v, and variable. Probably mount up a couple 4$ harbor fright DVMs like the one pictured one showing 0-20V and the other 0-10A.
It's setup to use a JST connector for 0-30V dc in (but my caps are 24v which is no problem because it's likely to run on a 12V wall wart, charging stations PS etc). I'll switch to deans sometime.
Pretty handy for 20$