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  1. Martaine2005

    Burning laser

    Some of these pointers are exremely dangerous. Especially imported ones. I don't know about the law in Netherlands, but over 1mw is illegal in the UK. Some are labelled 1mw but are really 10-100mw..Scary.. Martin
  2. Martaine2005

    Radio, ac or dc?

    Yep Uncle Chris, I was going to say exactly the same to both quotes.. The thing that I don't like about the OP's comment "mess about" is 'some' youtube videos show poking around with wire until audio is heard:eek:. Shocking practice:p... Pun intended.. As @davenn said first..What radio is it...
  3. Martaine2005

    Randomizer help

    You could also look up some 555 and 4017 random generators. Dice circuits for example. Just a thought.. Martin
  4. Martaine2005

    Reverse Polarity Damage... I think???

    Yes, as in probably easy to fix.. Even the IC's are in sockets too...Result.. Is your unit the "pixel"? There really should be protection on it. However, Spanish!! 'cat black', car red', 'the woman pretty'.....Who knows.:p Looks like the centre of the board is your DC in and two outside are...
  5. Martaine2005

    Reverse Polarity Damage... I think???

    Hehe Dave, A pinch, punch, first day of the month joke!!:p It might work! I have never tried:eek: Message to OP....That was a joke too..... Happy new year guys....:D Martin
  6. Martaine2005

    Randomizer help

    Lol, minecraft is a bugger!!! Have you researched this? Martin
  7. Martaine2005

    Randomizer help

    That's nice.. So it goes on and off then? How are you going to build it then? What ideas have you got? What research have you done? Martin
  8. Martaine2005

    Resistance seen by a capacitator

    Hello Mr Salami, What do you mean by "seen" and also "independant"? Capacitors have series resistance and ohmic resistance. http://my.ece.ucsb.edu/York/Bobsclass/194/References/General/ESR%20of%20Capacitors.pdf Martin
  9. Martaine2005

    Reverse Polarity Damage... I think???

  10. Martaine2005

    Reverse Polarity Damage... I think???

    Hi John, 1. probably 2. probably 3. No.....:) That's a real shame about the pedal. And yes, reversed the polarity is correct.. If you are lucky, no damage was done. IF the unit has reverse polarity protection! If it doesn't it could be a disaster or a simple fix! Can you post some pictures of...
  11. Martaine2005

    Thumb drive

    Hi reluctantsqirrel, Steve is correct. It is indeed a crystal oscillator. Probably 12Mhz for usb timing. Judging by the two legs, it will also be the cylindrical type too. Martin
  12. Martaine2005

    Help with decreasing current

    sorry, just eating my late dinner....
  13. Martaine2005

    Help with decreasing current

    OK, I would consider running the DVD player on 9v and trying that first. It sounds like it is "timed" to self destruct in a very short time... It should not be getting too hot at all.. Full stop.... Try it on 9v adaptor and see if it plays ok...My guess is it will...And stay a lot cooler too...
  14. Martaine2005

    Help with decreasing current

    Ok, nice info there. Have you touched the components while using the AC/DC adaptor? Do they get hot too? The current has nothing to do with this at all!! Current driven items are for things like LEDs. Not DVD players. If the 12v car battery is static, the unit should be good as gold... If it's...
  15. Martaine2005

    Help with decreasing current

    Sir Tonny, What is the DVD player you are trying to connect? If it's portable and batteries only, it might well be regulating itself via the batteries. If it has an AC/DC power supply, what does that say on the label? As Cjdelphi explained, it may need a regulator. A LM7812 would be perfect. But...
  16. Martaine2005

    Help with decreasing current

    Tonny, Most AC/DC adaptors are unregulated for these kinds of units. Cjdelphi had a good point, but generally unfounded in this situation. An unregulated 12v supply can output 17v or more, so without knowing the original psu specs it's difficult to say. I would guess that the DVD player already...
  17. Martaine2005

    Help on finding a DVD player that does surround sound

    I agree with your statement Gryd3. However, it is only a connector that (some cases) powers the DVD player, and all that is left is the audio! Doesn't take a rocket scientist to work out the left and right channels. The 5.1 amp does the rest. The OP hasn't replied with the model number yet. But...
  18. Martaine2005

    PSU Repair- Transformer outputting wrong voltage. Help much appreciated =)

    Hey Edd, under those conditions, the voltage would normally be higher. Loading it would give the proper specs. But without load as the OP is doing, I would expect 21+ volts. It also sounds like the OP is measuring this as a centre tap transformer. It is not. It has two 18v outputs. 0 - 18v and...
  19. Martaine2005

    OptiSound 5

    Speakers are rated in ohm values not voltage! The internal amplifier might have a voltage rating! Is there an amp? So, passive or active? Martin
  20. Martaine2005

    need a fuse resistor

    6 to 7mm x 2mm is probably 1/4 watt. But newer resistors are of similar size with a higher wattage rating. Your colours are an 82Ω resistor 20% tolerance. The wattage rating can always be increased without a problem. Just means it wont have to dissipate as much heat, which is a good thing!. Martin
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