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    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!!!

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

    Hi, Looking for a service manual for this scope. Any help thankfully recieved!!!!
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    $2 Ring Modulator

    A friend and I are putting these in all our new circuit bent instruments!!!
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    New to this forum

    Hi, Been interested in electronics since I was very young (now 41). Been a musician since 15 years old and a 'tinkerer' for almost the same amount of time. My interests regarding electronics are mainly audio related stuff. I build oscillators etc. and really into circuit bending. Not too good on...
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    Poorly oscilloscope?

    Hi all, I have a Kikusui COS5020 scope and a little worried about the waveform shape when calibrating (see pic). Pic isn't great but the arrow points to the not quite square line .Is this due to incorrect choice of probe?
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