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  1. darren adcock

    Recording and repeating voltages

    Hi all. I've been trying to research how to record and repeat sequences of voltages to no avail. What I want to be able to do is; use piezo discs and a signal conditioning circuit (courtesy of you guys a while back) to pick up vibrations from an area. then have a way of recording these and be...
  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

    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...
  5. 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...
  6. darren adcock

    transconductance amplifier

    Mostly I've read that the LM13700 IC is used to substitute for the lm3080 or CA3080. I can find CA3080's for sale but they are far too expensive for me. I know the lm13700 has a different pin out so my question is, is the lm13700 the best alternative to the ##3080? It's for use within the...
  7. darren adcock

    VCLFO question

    Not quite sure how to word this correctly which is probably why I couldn't find what I needed off google How do I change the sweep/voltage range on the cv out of VCLFO's, been trying to find a circuit, but think I lack the terminology to find what I need. I've added a diagram in case I'm not...
  8. darren adcock

    Mathematics

    I lack the mathematics accumin quite a lot with regards to electronics. I've been going through the khan academy online lessons. I'm at a very basic level, I just never got on with numbers and my education was poor. Has anyone else tried khan, or knows which specific parts of math I should...
  9. darren adcock

    SPICE alive

    Not really off topic, but thought rather than clutter up I'd post here. how the hell have I not come accross spice before...what an amazing bit of software. Gonna save me so much time, and hopefully you guys some time also. That's it, just wanted to say how excited i am by SPICE
  10. darren adcock

    Piezo Control voltage source

    Hi I tend to use piezo's quite alot. I would like to use them as control voltage sources for CV ins on my synth. I have been trying to work out how I make them more sensitive, does making them more sensitive mean getting them to give out a larger voltage range? or is the issue to modify the...
  11. darren adcock

    Twilight zone predictions

    seriously one of my favourite parts of this forum. We've been a bit starved of wacky ideas of late. I thought we could have a guess on what the next topic will be that gets put in the twilight zone? I'm going for "peer to peer internet powered by global consciousness".
  12. darren adcock

    Line splitter.

    Hi. So i've found myself a bit poor for a few weeks and want to try and make a bunch of utility modules for my synth as I think I have a lot of the parts in my workshop. I drew this up after reading Ray Wilsons op amp articles. Is it correct? Is there a better way of achieving what I want...
  13. darren adcock

    Signal mixer, voltage mixer.

    In my MFOS make; anaolgue synth book it says that to turn a signal mixer into a control voltage mixer I just need to bypass the caps on the each channels line inputs. Is this correct? Seems far to easy. If it is the case, what is about the capacitors thatwon't allow the Control voltages to be...
  14. darren adcock

    Progress

    Just wanted to say thanks to people on here who have helped me thus far in learning electronics. This week i managed todiagnose and repair tow faults in two circuits. I wouldn't have been able to do this without your guys patient teaching over the past couple of years. I'm sure I'll make some...
  15. darren adcock

    Pre amps or boosts

    Hi title doesn't really cover my question. In a modular synth I would like a bunch of pre amps/boosts or amps to control the outputs from various audio signal sources. I have built a couple of small single op amp mixers but I still don't get amplification that can help me match signal LVLS (for...
  16. darren adcock

    Before powering a circuit.

    I understand this depends heavily on types of circuits. What checks do people do? My checks are usually just checking rails are isolated and a pcb/solder inspection. But then I've read other methods for example checking resistance between rails and VCC+ and - on ic's. Feel like I want to...
  17. darren adcock

    Electronics Documentaries

    Been trying to learn more about the history of audio electronics (moog/fuzz) etc.... but thought in general it would be fun to have a thread of documentaries that are electronics based.
  18. darren adcock

    MFOS VCO fault

    Hi all. I've ran into a fault with a home built VCO module which I can't seem to locate. When I plug in it's power supply -12v +12v 3a it shorts across it's rails. I went to buy a new power supply today as I thought it must be that, i checked the supply befor plugging it in and there was no...
  19. darren adcock

    switch or patch

    I'm wondering if there's a way to use switches rather than patch sockets in modular synths? I'm guessing not as I would have probably seen it on synths, preferrably analogue. I'm imagining a set of switches that can overide each other, I'm also imagining a matrix nightmare! Happy with patch...
  20. darren adcock

    motor problem.

    Simply I can't get it to work. When I continuity test across it's lugs it shorts. disconnect one wire and it shorts across the brushes. I'm unsure if this is normal. It's a Parvalux some of you helped me get a correct power supply for a couple of years back. Spec: dc 24v. amps 8. 120w. rpm 2800...
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