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Registered Member #1415
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Posts: 21
I recently completed the logic power supply section and tested it, but it wouldn't work. The green LED on the display board showed that the 15V supply was on, but the 5V failed to light. I then checked the 5V voltage regulator and it was extremely hot. I even tested the transformer and it gave 26 volts of AC. (that can't be the problem) What could of caused the 7805 voltage regulator to become extremely hot and not function? (I also had the earth ground line connected into the board from the plug and the transformer, so I am clueless as to why it won't work. Any ideas or suggestions would be helpful. The schematic is here, its titled low voltage power supply.
Registered Member #1415
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thats true
I guess the only thing to do would be to get a transformer with an AC output of like 15V, but I find it hard to believe that the Mini Brute parts list called for a transformer that gave too high an output voltage.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
Transformer output side is centre-tapped and each half is half-wave rectified. Resulting un-regulated DC to the voltage regs is in the region of 18volts, which is within spec for the regulators. I would suggest checking for shorts between the +5V line and ground as a starting point.
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Mini Brute Logic Power Supply
