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  1. Martaine2005

    Any idea what these are?

    you are welcome. Martin
  2. Martaine2005

    Bass Amplifier troubleshooting

    Hi Joe, So just to clarify, when it buzzes, and the volume is on zero the buzz can still be heard? Did you check the secondary voltages? And checking all the pots just to make sure there are no dead/dirty contacts by a squirt of switch cleaner or similar. Poking around the caps (and the caps) to...
  3. Martaine2005

    Bass Amplifier troubleshooting

    And I forgot to ask, When the buzz stops, does the amp act normally?
  4. Martaine2005

    Bass Amplifier troubleshooting

    Hi Joe, have you checked to make sure the mains cable earth is intact? Does this buzz happen with no volume or can you control it by the volume knob? Also, you said it sometimes stops. So intermittent buzzing must have something to do with a dry/broken joint. Can you power it up and poke the...
  5. Martaine2005

    Item Identification

    Ha! Dave, you beat me to it.
  6. Martaine2005

    Item Identification

    I agree with the above. Squeeze the bottom section inwards, toward the cable. Martin
  7. Martaine2005

    Any idea what these are?

  8. Martaine2005

    Electronics Project Help!

    Also, if your budget is £100, I bet you can find one of these cheaper somewhere. Martin
  9. Martaine2005

    Electronics Project Help!

    I think there is a communication error going on here. He said he has a small amp! The 150w is an inverter, which are small too.8"x4". But it all depends on the amp he has. So what amp have you got? Also, these cheap inverters are being advertised as 'msw'. The general public wont have a clue...
  10. Martaine2005

    Can any body help me in making dual 24 Volt 5 amp Regulator??

    Hi Pashu, Both regulators you mention are only 1 amp max. How does stacking three in parallel give you 4.5a? Isn't that 3a? If you want 5 amps, you need to start with a 5a regulator. If you get a variable regulator say, 1.2v to 30v, put the pot inside and 'set and forget'. I would prefer the...
  11. Martaine2005

    Electronic supply, help.

    You will never compete with China. Nearly all the electronics suppliers get their items from overseas and whack on a huge profit. In the UK we have RS components and Maplin. Maplin don't even bother to change the packaging!! £40 in Maplin and the exact same item from China £12 inc free p&p. Martin
  12. Martaine2005

    Piezo-triggered twinkling LEDs

    Yeah, I am sure I remember 'Adam' from MAKE: doing something like 'wearables'. And using the conductive thread, he was able to place pcb, battery etc in different parts of clothing. However, probably not ideal in the op scenario. Even this has wires and batteries. But has a good effect. Martin
  13. Martaine2005

    How to best simply invert a 110v ac current w/minimum change to the voltage

    Sorry Duke. He wants to keep the noise. And invert AC siganal. Martin
  14. Martaine2005

    Power amp fan trouble

    Can you replicate this with both fans/transistors? Martin
  15. Martaine2005

    How to best simply invert a 110v ac current w/minimum change to the voltage

    David, nobody understands what you are talking about. Inverting AC? Turn your scope upside down. Job done! Sorry to say this, you are talking nonsense. Noise on the Ac will duplicate as it goes through 0 to the opposite side of AC AC goes up then through 0 to AC down. It's a sinusoidal (sine)...
  16. Martaine2005

    Resistances of different lamps

    That's a good point Bob. Both the bulbs I just checked wer 240v and 40w , 60w. Obviously both had different resistances. But the resistance measured was for a 240v 40w bulb.
  17. Martaine2005

    Siemens waching machine Siwamat plus 7421 repair-need schematics

    Ha! glad you sorted it and found the problem. So, maybe, you was exagerating with the loud boom! You must have known the boiler was leaking before it 'broke' the washing machine!!! Good on ya for sorting it. Martin
  18. Martaine2005

    Power amp fan trouble

    When you probe? with a DVM? Are you using chassis ground too? If so, your meter could be acting as a 'pull down'. What happens if you leave the probes in place and power on the amp? Martin
  19. Martaine2005

    AC Compressor blowing fuse

    Hi Jerry, Some people do use bulbs to find short circuits. The bulb goes in series with the load. Or for a car can replace the fuse. Just make sure the wire connected from fuse box to the bulb is heavy gauge. I have never done this but know many car electricians that do this. Martin
  20. Martaine2005

    Resistances of different lamps

    Yes, I just had to try that. Martin
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