Last post by minionas - March 14, 2020, 02:06:52 PM
Ive installed R9 and R10 1 ohm resistors. Had some fun with one new resistor so had to open the schematic and look for problems why one LED does not emitt light on second power on while it did lit on first power on. And finally found one of new 1 ohms resistor faulty. Changed it again and now both LEDs are lit brightly.
Ignore my dumb measurement as i was not aware that pins of LM317 and 337 are alocated differently, therefore input is the same for both of them - ~25V.
Also ignore my dumb question/statement that i get different voltage after rectifier bridge, as it is the same for both sides as after inspecting schematics now i know where to measure :)
Last post by peranders - March 12, 2020, 08:57:12 PM
The AC voltage should be a few uV but this must be measured with special equipment. Check first the incoming voltage. It should be at least 4 volt more than the output voltage, in your case 19 volts. Measure at the input of the LM317/337.