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  1. Martaine2005

    dead Turbolink LC-A420ATX pc power supply

    You can check for a failed ‘short’ with any multimeter either Ohms range or continuity. And obviously if failed ‘open’. That PSU doesn’t have a good reputation within the ‘over clockers’ community. But they abuse and fry things regularly. So that means nothing :) Martin
  2. Martaine2005

    RGB LEDs

    Yes, visible in daylight on my breadboard and more so inside the car on a black dashboard. At night, it’s a perfect glow to be seen but not dazzle. They are diffused so visibly good all round. An example of dim/glow is a TV standby LED or smoke detector LED. Although these obviously vary from...
  3. Martaine2005

    RGB LEDs

    Measured current is 05.3μA and calculation is 0.00000595. Martin
  4. Martaine2005

    RGB LEDs

    Oh dear me. That should have been 0.000003, I omitted a 0. I have done some measuring this morning and double checked resistors. Forward voltages are 1.8V red, 2.1V green. (Blue 2.9V). The result for a 2MΩ are: (14-2.1)/2M=0.000005μA. The GREEN LED is visible in daylight and a perfect glow in...
  5. Martaine2005

    RGB LEDs

    Hi guys, I am a little discombobulated. I don’t have the data sheet for these. I have 5mm RGB common anode and common cathode LEDs. I am only using RED and GREEN, BLUE leg is snipped off. I want GREEN on constantly dim and RED to over power the GREEN by being brighter when switched on. I’m...
  6. Martaine2005

    Capacitor Rating

    Yes, that too. Many revisions may have been done due to early failures or warranty returns. Only they will know. Martin
  7. Martaine2005

    Capacitor Rating

    It could quite simply be an error on the schematic. I’d go with what values are factory fitted on the board. It could also be that somebody repaired it and misread the schematic or didn’t have that value on hand. I’ll stick with an error. Martin
  8. Martaine2005

    Capacitor Rating

    1 F = 1000000 µF 1 µF = 1.0E-6 F Example: convert 15 F to µF: 15 F = 15 × 1000000 µF = 15000000 µF Farad [F] Microfarad [µF] 0.01 F 10000 µF 0.1 F 100000 µF 1 F 1000000 µF 2 F 2000000 µF 3 F 3000000 µF 5 F 5000000 µF 10 F 10000000 µF 20 F 20000000 µF 50 F 50000000 µF 100 F 100000000 µF 1000 F...
  9. Martaine2005

    accidentally cut off 24 pin ATX power connector and want to reattach, question

    Whatever the amperage on each rail is, will be the max whether one wire or 10 wires. The connector has several wires of the same voltages because they split off and go to various parts of the circuit. You can solder them all together with no ill affect but will be very unsightly. But make sure...
  10. Martaine2005

    Sony CD/DVD player won't power on after opening case

    I suggest you carefully open it again and re-seat any connectors that may have dislodged. You clearly disturbed something or it was a (doubtful) coincidence. Martin
  11. Martaine2005

    Help with Diode

    A standard 1N4xxx series will be fine. Voltage and amp ratings are maximum values. So don’t worry about that. A 1N4007 is rated for a maximum of 1000V and 1A. Martin
  12. Martaine2005

    accidentally cut off 24 pin ATX power connector and want to reattach, question

    Generally speaking, yes you can. You’ll notice that all the ‘orange’ wires are grouped and soldered to a single bus line. So in theory, it won’t matter what ‘orange’ +3.3V wire you connect to any +3.3V pin on the connector. But you’d be better to solder each one and insulate with heat shrink...
  13. Martaine2005

    Water tank sensor

    It should be a criminal offence not having an oscillator and capacitor.:) Martin
  14. Martaine2005

    I’m looking for an elegant solution to power an old radio with 220v dc

    This is an interesting read for the OP. How to put a modified unit back to original. https://www.radioblvd.com/bc348_dynamotor.htm Martin
  15. Martaine2005

    I’m looking for an elegant solution to power an old radio with 220v dc

    Apparently, it was common to wire all the series-parallel heaters in parallel. This meant the heaters run on 6.3Vac rather than the original 24v/28vac. Martin
  16. Martaine2005

    Play a D VD Player through a Guitar amp .

    Probably RCAs are for pre-amp in. So you’d need to use the volume on the Input source, ie MP3 or DVD player. Where as the amp input jack has it’s own pre-amp and volume control. Are the RCAs definitely an input? Not for output recording?. Martin
  17. Martaine2005

    Temperature probe - LCD display missing segments

    Not if it’s the LCD. But bad connections are common. Ribbon cables and/or solder joints can be checked. Sometimes squeezing or twisting (carefully) the device can confirm a bad connection. Martin
  18. Martaine2005

    HDMI Port

    TBH, I am too. It could have been a mistake on the PCB/design and cheaper to re-pin the HDMI connector. Who knows?. Either way, a parts unit is always a good idea providing its not a known problem with the connector. Martin
  19. Martaine2005

    Automatic links

    The inserted links have been going for a while. I don’t mind either if it indeed linked to the appropriate item/device but instead links to AAC with “no results”. Martin
  20. Martaine2005

    Hi y'all, need some old school help.

    Have you researched it? Have you got a multimeter?. Have you opened it?. First check you have mains voltage to the primary side. (Fuse and mains cable). 2. Check secondary voltage. 3. Check bridge diodes. 4. Check filter caps. 5. Check LM7812 regulator (if it has one). Let us know your findings...
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