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22nd June 2015, 11:28 PM #16ADDED BY ADMIN
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22nd June 2015 11:28 PM # ADSGoogle Adsense Advertisement
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23rd June 2015, 09:57 AM #17SENIOR MEMBER
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Can you whip of the serial number sticker so we can see whats under it? I have a good guess that its a switchmode controller IC, but if I know which one I can try look at where the potentiomer goes and see if it will affect the current limit. A quick gander at it looks like the pot goes to that IC.
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23rd June 2015, 10:38 AM #18SENIOR MEMBER
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23rd June 2015, 05:22 PM #19SENIOR MEMBER
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23rd June 2015, 05:30 PM #20SENIOR MEMBER
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I also hooked up a motor directly to m+ and m- and the motor ran fine with no faults
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23rd June 2015, 07:03 PM #21SENIOR MEMBER
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23rd June 2015, 07:04 PM #22SENIOR MEMBER
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The pwm control for the motor.
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23rd June 2015, 07:50 PM #23SENIOR MEMBER
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23rd June 2015, 11:30 PM #24SENIOR MEMBER
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http://pages.ebay.com/link/?nav=item...249267&alt=web thats the control. Ive used ine before on another project and i liked it.
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24th June 2015, 10:44 AM #25SENIOR MEMBER
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There is a serial number sticker on one of the components. That components is what controls everything in the power supply. On top of that component will be a part number, maybe UC3000, or TL494 or similar. If you can give me that part number, I can attempt to reverse engineer the part of the circuit that does the speed control and current regulation.
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24th June 2015, 05:22 PM #26SENIOR MEMBER
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24th June 2015, 07:28 PM #27
I've used that PWM controller on different projects, it's a nice little board for the money.
I don't know why it's tripping your power supply current limit, it might be a current spike while charging the electrolytic cap, or it could even be a faulty board.
It's a single IRLR7843 FET pwm switching to ground, non reversible, Power Schottky flywheel diode. A 20 pin STM8 embedded controller doing all the smarts, 78M05 regulator, nothing much else to see.
If you are using it for power feed, how do you do reverse? If you reverse polarity on this board you'll probably zap it.
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24th June 2015, 07:49 PM #28SENIOR MEMBER
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i have used the board no problem, it was part of a kit from little machine shop and used a double pole switch i believe it called.. as i said before the control for the motor speed is pretty and doesn't offer any slow speed its pretty muh 100-80%
i did a quick fit with the PWM control and found it was much better at the lower speeds. Im starting to think its going to be too hard to get the original board to feed the PWM and would be much easyer starting over, ive got my eye on a 2amp power supply that can feed the pwm control, im just lacking current limitating, i need it to cut out at 1amp. i was thinking about using a slow blow fuse buy a heap of them and replace as they blow?
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24th June 2015, 08:08 PM #29SENIOR MEMBER
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A power supply like this would be more appropriate:
http://oceancontrols.com.au/PSM-2523.html
It's got current limiting, which at 25W and 24V is about an amp.
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24th June 2015, 08:17 PM #30
You can get small DC circuit breakers, they are resettable, or you could just put a polyfuse in circuit, they automatically reset when the power is cycled.
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