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  1. darren adcock

    VCLFO debugging

    I'm sorry Kelly's eye I don't understand. I don't know how to get my DMM to read -12v? Am I taking readings incorrectly? I wrote pins 4 of TL082's as "-" as I didn't think it would work putting my probe from DMM onto them. When I put meter accross pins 4 and 8 it reads 12v. If that is...
  2. darren adcock

    VCLFO debugging

    I can't find any shorts around U2. Been through and changed all IC's now. And still the same.
  3. darren adcock

    VCLFO debugging

    cheers. my mistake for not making my readings clear. I've edited post now so it doesn't look like pin 4 is 0.5v. My power supply reads 12v.
  4. darren adcock

    VCLFO debugging

    Ok. Yes using my bench supply. my black probe is sat on 0v.
  5. darren adcock

    VCLFO debugging

    Hi all, for the life of me i can't figure out what mistake i've made putting together a MFOS VCLFO. Usually when i get readings like this I've done somert rediculous, but i can't seem to find my obvious mistake and was hoping you guys could help please? I include meter readings of transistors...
  6. darren adcock

    tip120 driving led array

    Ok Bob thanks. Most of the fun in making is learning!
  7. darren adcock

    tip120 driving led array

    for pcb etching
  8. darren adcock

    tip120 driving led array

    Ok thanks Steve. It has a zero - three minute timer. I will get ordering a power supply today. Just out of curiosity was it really neccesary to use U.V led's for the exposure unit? I just had loads of em on hand so was convenient, but also thought that this might be best anyhow.
  9. darren adcock

    tip120 driving led array

    Now I've got it working ok. I need to check it's safe (components anren't going to burn up). How do I do this please? As Bob says it's drawing 2.4amps. Do I need a power supply that can deliver this? Best Darren
  10. darren adcock

    tip120 driving led array

    Ooooo thanks Steve. That's really helpful. I usually stick to low power audio circuits but like a new challenge and I've found it's all relevent. I wll check out the resources section, I didn't realise there was one. This has also made me realise i need to pay more attention to temperature of...
  11. darren adcock

    tip120 driving led array

    Thanks Bob and duke and Kelly's eye. This has been a really helpful learning curve. I got impatient waiting for a irf540 to arrive so went through my circuit junk box and found an 80NF70 with a large heat sink. I got this all wired in yesterday and it seems much happier. Initially I was...
  12. darren adcock

    tip120 driving led array

    http://i.imgur.com/wkwfjMB.jpg
  13. darren adcock

    tip120 driving led array

    I will draw it tomorrow. Just rubbish at it so was trying to get away with it!
  14. darren adcock

    tip120 driving led array

    Ok, so after researching I've found the irf540 mosfet. This a good choice?
  15. darren adcock

    tip120 driving led array

    Thanks I'll research this and head back here to double check
  16. darren adcock

    Non existent jack adapter

    Used to able to get these for acoustic guitar pre amps ... maybe search around that? I'll have a nosey about also
  17. darren adcock

    tip120 driving led array

    HI all. I would like some help with a circuit please. I have discalcula so please bare with me. I have made an array of 120 5mm U.V Led's for an exposure tank. I have divided the Led's into groups of 4 and have a 47ohm resistor before each group. I am taking power from the emitter of a...
  18. darren adcock

    Strange Behaviour

    Ok. So when the tip of a jack (4 sections to the jack) touches only her skin it clicks loudly. If she holds the plastic jack cover there's a faint click. She has no electronic devices on her, n internal devices either, no metal plates etc... just fillings, no previous radiotherapy or MRI scans...
  19. darren adcock

    Strange Behaviour

    just asking her now, thanks guys, will report back
  20. darren adcock

    Strange Behaviour

    Hi all. This is a bit odd, but I can't find an answer however much I research. My partner has a strange connection to the auxillary audio in our car. When she touches it, it makes a very loud and repetitive click click clicking. For no one else this happens. We have tried all kinds of different...
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