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  1. D

    Help with siren circuit

    Thanks! I thought op-amp would be the way to go
  2. D

    Help with siren circuit

    Anyone, please!
  3. D

    Help with siren circuit

    Hi, Hope u are all well since my last visit here (2 years ago?). I'm looking for a bit of help with a circuit I'm building. It's a siren based on a 555 which is familiar to many of you. I'd like to make the rise and fall quite long, around 10 seconds from low to high and back to low. I would...
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    Op-amp help please!!!

    lol!!!!!!!!!!!!!!!!!:D
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    Op-amp help please!!!

    Just re-thought my idea...........the dual supply was a pain and achieving excellent results with an LM386. Basically feeding the output back to the input with an RC network. May be not the best way of doing the job but it works! I'll revisit the op-amp method at a later date. Many thanks again...
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    Op-amp help please!!!

    Many many thanks again for you're knowledge. It's wonderful that you are able to share it with me in your own time!!!! The reason I ask about op-amps in the first place is cos I'm building this: http://www.electro-music.com/forum/viewtopic.php?highlight=lm741&t=3489 It's the hand drawn...
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    Op-amp help please!!!

    Cheers guys that's all helpful stuff! This is an awesome forum!!!
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    Op-amp help please!!!

    I'd appreciate any help! Trying to breadboard an LM741 filter but don't understand the concept of two different power supplies.
  9. D

    New project: Voltage Controlled Filter

    Thanks for the advice all!!! Considering buying the board after all.
  10. D

    New project: Voltage Controlled Filter

    This is roughly what I'm looking at building.......... http://musicpcb.com/pcbs/gristleizer/
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    New project: Voltage Controlled Filter

    Yeah, thats sounds right!
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    New project: Voltage Controlled Filter

    By the oscillator I think :o
  13. D

    New project: Voltage Controlled Filter

    Hi, Sorry if this is a bit vague:o I'm looking round for a schematic for a VCF (easier the better). In short I want a LPF that is controlled by a oscillator outputing sine, square, sawtooth waveforms. I want to be able to control the rate of the oscillators. Any advice would be great!
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    Kikusui COS5020 service manual

    Cheers Steve!
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    $2 Ring Modulator

    As there is a fool proof guide in the description of the video I decided not to do a schematic.....besides, my drawings are confusing!!!
  16. D

    Kikusui COS5020 service manual

    Thanks Dave.........couldn't find one :-(
  17. D

    Kikusui COS5020 service manual

    Hi, Looking for a service manual for this scope. Any help thankfully recieved!!!!
  18. D

    Poorly oscilloscope?

    Consulted a friend and he says it needs calibrating so anyone have the service manual? Thanks in advance!
  19. D

    $2 Ring Modulator

    Will do!!!
  20. D

    $2 Ring Modulator

    A friend and I are putting these in all our new circuit bent instruments!!!
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