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  1. Martaine2005

    Schematic that doesn't specify components ?

    C57 = 220 picofarad. R99 = 47Ω.
  2. Martaine2005

    In-Car CCTV project

    Absolutely. It was fun and also very practical. I installed two front IR LED units and two rear. Night time is like daylight for about 8 meters. The world is your oyster! Martin
  3. Martaine2005

    In-Car CCTV project

    If they are recorders, they have to have inputs, be it audio, video or both. What you want is readily on the market in many guises. Buses, taxis and my van have CCTV throughout. Mine is 4 channel audio and video. I also wanted discrete. Naturally, with an OTS setup, cameras look like cameras...
  4. Martaine2005

    tinning

    I personally tin every connection and then solder. Obviously through hole PCBs are the exception. There are other things that I don’t tin, but I can’t think what they are at the moment. For me, tinning makes it easier and quicker to solder. Others may have differing opinions but that’s how I do...
  5. Martaine2005

    function but turns on once the sleep button is pre

    Perhaps you should have made that clear in your first message. You asked for suggestions, nothing else. @shrtrnd is not a mind reader, he doesn’t know what you have done. Only what information you give in your message. You may get help if you post a picture of the switch/button, but as you are...
  6. Martaine2005

    Help identifying SMD diode

    That’ll teach me to link from a description. My link gives an extra leg free!. Martin
  7. Martaine2005

    Unusual Touchscreen Monitor Power Supply - Never saw before

    Three things may have happened here. 1. The computer failed and damaged the original PSU. The owner couldn’t get a replacement PSU so gave it to a thrift store not knowing the computer died. 2. Your dell replacement PSU worked but the computer damaged it. 3. The Dell replacement PSU pin...
  8. Martaine2005

    Battery ruined by diode and LED

    Amen.
  9. Martaine2005

    Help identifying SMD diode

    How did you do that? This link should give you the diode plus some substitutes. From here. Martin
  10. Martaine2005

    Kchibo radio

    Sorry, not sure I understand you correctly. The volume is half of what is was before the wire broke off?. Try moving the negative wire to a different point. Better to use a magnifier and find where it was originally. The switch may need a simple clean. You can spray a contact cleaner in the...
  11. Martaine2005

    Looking for a suitable universal charger for a variety of electronics

    The link to the adapter you supplied will be fine for some smaller electronic items to test. 1A max is on the low side. Get one with 3, 4 or 5A. Watts = V x A. What you are asking took us guys years to obtain / build / make. We all still have to make or alter what we have, to power something...
  12. Martaine2005

    Looking for a suitable universal charger for a variety of electronics

    This is a big ask!. Is it for testing the item before re-sale? Or to sell with the item?. There are plenty of universal power adapters with a range of different DC jacks, but these are typically something like 4.5V to 12V. Maybe 4.5, 6, 7.5, 9 and 12V. Then there are typical 19V laptop...
  13. Martaine2005

    Your Problem Solving Method

    The usual method is to double check everything before applying power. Yes, sounds like a short. Always use your multimeter to check continuity where wanted and a short where continuity is not wanted!. Martin
  14. Martaine2005

    Resistor codes

    1% and 2% can be a real PITA. Like I said previously, I have to read them both ways to find the logical Value. Then measure to verify. I made myself laugh when reading a 100Ω 1%. Martin
  15. Martaine2005

    Voltage Regulator Problem on Moving Head mainboard

    Yes, good call Ed. I never thought about caps as these units are 2017 and newer. You can use any Ecap with same values. On through hole, I just tack another cap across the suspect for initial testing. You’ll need to remove yours. An easy way to remove them is with pliers and twist them off...
  16. Martaine2005

    Resistor codes

    That question really tickles me. I asked the same question. I still have problems sometimes. I found it easier to work out both ways and see what was more in line with current values. Then measure it. Or measure first then calculate both ways. It does get easier for more often used values. Have...
  17. Martaine2005

    Kchibo radio

    If you have a multimeter, you should be able to find GND (negative) on the board. You can find GND by looking at capacitor negative terminal in most cases. Use the mutimeter or continuity tester for continuity at these points and board traces. You can connect the battery negative there (in most...
  18. Martaine2005

    Voltage Regulator Problem on Moving Head mainboard

    Wow, but that price doesn’t surprise me. I looked briefly at the datasheet that @bertus linked to. On the TD7590, GND is pin 2. You have 12V on pin 2 on both units. Can you verify which is GND on your TD7591?. F/back is pin 4 on the 7590. The threshold voltage is 1.2V which you have on the good...
  19. Martaine2005

    Voltage Regulator Problem on Moving Head mainboard

    Sorry, my unit is of no use. It’s the old PC-08 power distribution panel. (Switch panel). Martin
  20. Martaine2005

    Hello, Welcome! (Introduce yourself)

    Welcome to EP Jim. Martin
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