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  1. darren adcock

    PSU advice

    Thanks folks. I understand this advice apart from 'solidly' grounded and how to test for a shorted turn in the transformer. I am researching the inrush current limiters and where to place them, I'm assuming it needs to be added to the live line between iec and tansformer Solidly grounded is...
  2. darren adcock

    PSU advice

    Hi all. I need to build or buy a PSU for an analogue synth I building. I am asking for advice here as you've always helped me make sure I am working safely. I essentially need to build a power supply. The Kit I have been advised to build is from Soundtronics (UK)... which includes a PCB...
  3. darren adcock

    Solenoid reading

    Hi all, still stuck in Modular synth build but want to start doing some reading around solenoid circuits for when I've finished this build, mainly I'll be wanting to work with 12v or less solenoids so i can trigger them from my modular synth. Just wondering if anyone has good links or a book I...
  4. darren adcock

    Pressure sensitive surface

    No worries now, Yup, defo reinventing the wheel. Sample and Hold... now i know what this means and how to use it.
  5. darren adcock

    Pressure sensitive surface

    Pretty much solved the initial problem with two copper strips a piece of conductive foam and part of a circuit i took from a Thomas henry book. I'm not quite sure how the initial variable voltage part of the circuit works. Apart from the foam increases in conductivity as it is compressed. I can...
  6. darren adcock

    Pressure sensitive surface

    I guess also if after researching ferrite core and coil approach there'd be no reason for this to not be part of a surface
  7. darren adcock

    Pressure sensitive surface

    Thanks K.E. I will look into this now... putting the sensor inside the drawing implement is an approach I'd not considered.
  8. darren adcock

    Pressure sensitive surface

    Oh and i realise I've not said how much weight, in terms of what the load might be. It's for a project where by a person can draw onto a surface. It's part of research into developing therapeutic tools. So in this case it would combine Drawing and sound.
  9. darren adcock

    Pressure sensitive surface

    http://www.nakka-rocketry.net/loadcell/amp_circ2a.gif Looking further i have come across Load cells and wheatstone bridges.. as an analogue front end to a larger circuit which requires a digital section also...I'd prefer to keep it all analogue if possible.... but will keep looking.
  10. darren adcock

    Pressure sensitive surface

    Hi folks I would like to control the CV controls on my synthesizer with pressure. I have been through piezo discs and soft pots but neither have done what i would like. I would like to apply pressure to any part of a given surface (hence softpots didn't do the job, unless i've missed out on...
  11. darren adcock

    Positively charged "holes"?

    Ok Ratch, will do. Thanks for your time.
  12. darren adcock

    Positively charged "holes"?

    Hey, i'm back peeping out of the rabbit hole, maybe scrabbling for air. So I've been trying to understand electric fields (I'm not quite sure how to understand magnetic fields in terms of circuits yet, but hopefully it will pop up in khan academy lessons). I see above Ratch explained explained...
  13. darren adcock

    Positively charged "holes"?

    I've been drawing myself some diagrams which let me have an insight at most i guess but even that is progress, but that's ok as I'm quite happily humbled... at heart i'm a geek and haven't pursued any interest without having to nibble away at it roots. My theoretical knowledge will be a drawback...
  14. darren adcock

    Positively charged "holes"?

    Thanks guys. These are useful. I will go off and learn some more terms so i can understand exactly, maybe draw myself some diagrams. I'll have to read these replies over several times as it takes me a while to process written information. Thanks again Darren
  15. darren adcock

    Positively charged "holes"?

    I realised after a conversation with a friend that I'd completely miss-understood how electrons worked especially as I was trying to explain how transistors worked.... So now I understand that electrons are negatively charged and want to move to a positively charged space.... in the tutorials...
  16. darren adcock

    transconductance amplifier

    At the minute i'm working on this Foolish (won't be the last foolish tape head) cassette module. 3 personal cassette player mechanisms nicked form cheap walkmans. They all have internal speed control, zero to about double speed (really need to check what expected regular play back speed should...
  17. darren adcock

    transconductance amplifier

    Hi Steve yes 6 (.3) mm jacks. The modules i'm making started out at 13cm by 25cm.... their size is difined a bit by what scrap wood I find and how much i can be bothered cutting this to size, my next modules will all be 13cm by 21 cm as I found a chest of draws i'm currently cutting up. I...
  18. darren adcock

    transconductance amplifier

    You live in Manchester?
  19. darren adcock

    transconductance amplifier

    Hi Steve, i'm not sure what defines eurorack? flipping heck that synth looks good! envy :) You live n Manchester? my synth looks a bit like this....there's two more vco's to be added, two more VCLFO's, a Noise generator, a mixer, a signal splitter, built and tested, just need to be painted.
  20. darren adcock

    transconductance amplifier

    HI Steve. hanks for your reply. Yeah I'm building a modular synthesizer. Mostly I've been building all MFOS modules but keep running out of money. So was just nosing around for a VCA circuit that i could knock up on stripboard, i liked it's design, low part count and it's duality in that i...
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