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  1. Martaine2005

    cap self discharge

    The circuit ‘myth’ is in fact very true. Without the resistor, the capacitor would eventually discharge through the circuit. Or at least hold its charge. The resistor discharges the cap when the supply is interrupted. The resistor also keeps the cap discharged when no supply is available. A...
  2. Martaine2005

    Repair to Control Board PCB of Whirlpool Oven

    Also, the forum is global. While you’re typing, others are sleeping and then off to work. Martin
  3. Martaine2005

    Help me to solve this Complex Falult of Sony Trinitron Crt Tv

    From experience, all Sony TVs had a known issue with dry/cracked solder joints. It was the number 1 go to for techs. Based on that, I’d check or just reflow the board. Martin
  4. Martaine2005

    Noisemaker Revenge Machine

    Ok, keep us informed with your progress. Martin
  5. Martaine2005

    Stage Line 500W amp repair project

    If you do decide to buy a BNC to BNC, get a 50Ω lead as well as a direct connection. It had me scratching my head only getting half the peak to peak voltage. Martin
  6. Martaine2005

    DSC 1832 DLS 5 locked out

    Thanks for the update. Our resident alarm specialist can go quietly back to retirement. Martin
  7. Martaine2005

    Air Hockey Table Scoreboard help

    I would guess that the board with a black blob (controller) is damaged. These sometimes have part numbers printed on them and should be available to buy a replacement. Can you trace each output from the ‘blob controller’ board to the transistors?. You could try injecting voltage at the outputs...
  8. Martaine2005

    Heathkit Super Clock GC-1195 w/chimes

    @whitetm What LED do you want to use? Martin
  9. Martaine2005

    Heathkit Super Clock GC-1195 w/chimes

    Resqueline was last seen in 2012. Just saying.. Martin
  10. Martaine2005

    Noisemaker Revenge Machine

    Throwing money at similar boards won’t help. That board is timed to change direction. Why not think ‘outside the box’. Raise the motor so the ‘cam’ spins freely, screw down a piece of hacksaw blade or similar that the cam lifts each revolution. When the cam passes, the flexi metal or similar...
  11. Martaine2005

    What causes more energy loss out of an LED or a SPARK gap

    In order of obsession: Capacitor, voltage divider, oscillator and spark gap. Now let’s add to his repertoire: Inductor.
  12. Martaine2005

    Looking for an unusually large capacitor or a replacement

    Yeah, I covered the high voltage and became complacent.....once!. Martin
  13. Martaine2005

    Noisemaker Revenge Machine

    That unit will do exactly what your new board does except it has a reverse switch. The switch needs manual input so it won’t help. We need to find an easy way for the motor to spin and ‘knock’ on the casing, giving the desired effect. Perhaps raising the motor so the ‘hammer’ clips the casing...
  14. Martaine2005

    Noisemaker Revenge Machine

    I am even more confused now. I thought you were putting the new board in the orange device. I also thought the ‘hammer’ counter weight spun hitting the back of the orange plastic like a cam. The motors are screwed down, the motor shaft spins, the counter weight knocks. So, what are your...
  15. Martaine2005

    Air Hockey Table Scoreboard help

    The same issues?. What’s the voltage from the new adapter?. Voltage on the 2 pins you measured previously?. I notice that the missing segments do work, so LEDs are ok. All the components on the board can be checked quite quickly with your meter except the ‘blob ic boards’. Those are the main...
  16. Martaine2005

    How come these alligator clips only transfer electricity when swapped at the battery terminals?

    The idiot diode/fool proof thing is very real. If your cable has a diode, it will probably be in series with one of the wires. Probing the wires both ways will find it. Edit: you say reversing the leads polarity gets voltage to the jack. This suggests a reverse biased diode in the positive feed...
  17. Martaine2005

    COVID-19

    Obviously not a good ‘spreader’ or sharer!. Luckily, selfish. Martin
  18. Martaine2005

    Noisemaker Revenge Machine

    Ok, I think I understand. The motor rotates half a turn and “hammer” hits, motor reverses half turn and “hammer” hits the other side. This repeats over and over?. The new board is just a motor (PWM) speed controller. It sounds like the original board is an H bridge. But I can’t find any useful...
  19. Martaine2005

    Looking for an unusually large capacitor or a replacement

    Did you replace all the electrolytics as a complete overhaul?. I thought the audio was coming in and out on one channel?. Now one channel is dead?. Having a working channel should make diagnosis easier. Follow both supply rails making notes of voltages. You can cut cardboard or similar to...
  20. Martaine2005

    Noisemaker Revenge Machine

    Sorry, I am confused. I’ll read this thread again so hopefully makes sense to me. But if motor is rotating in undesired direction, simply reverse the motor connections. Martin
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