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One For The Real Electronics Experts...


yetanotherchris

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Ok folks, I'm preparing my second reworking of an old guitar, and I've had a bit of an odd idea for a kind of 'killswitch/tremolo'.

Basically what I want to do is have a toggle switch on the guitar where the output goes to the jack. In one position the output just goes to the jack as normal. Consider it the 'off' position for the 'tremolo'.

In the other position the output is rerouted through an LDR (Light Dependent Resistor) mounted on the front of the guitar. When there's lots of light hitting the LDR, the signal is unaffected. But if there's little/no light (ie when I pass my hand over the LDR) the volume is reduced/cut.

What I really need is some advice on components/wiring. For example, Maplin stocks loads of LDRs, but I don't know which would work for my purposes.

http://www.maplin.co.uk/SEODynamicPages/mo...asp?ModNo=35962

Also, how best to wire in the LDR and toggle switch, and whether any other components would be needed... any advice would really be appreciated!

Thanks folks!

Chris

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The LDR's resistance will increase as you reduce the light, but you'd have a hard time getting it to zero resistance. In full sunlight all the ones I have don't even get close. LDR's are the worst toleranced part I've ever come across too.

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Hi there,

the best you can do is to build an active circuit using the ldr as a "controller".Active circuit means that it needs a 9 volt battery.Do you have space for a 9 volt battery in the guitar?Answer me and i can give answers and even a circuit for the job.But have in mind that you have to move your hand pretty close to the ldr in order to affect the light which goes the LDR.I think that the best thing that would the job would be somekind of a "proximity" sensor which is used by some synths to control some parameters.

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Hi there,

the best you can do is to build an active circuit using the ldr as a "controller".Active circuit means that it needs a 9 volt battery.Do you have space for a 9 volt battery in the guitar?Answer me and i can give answers and even a circuit for the job.But have in mind that you have to move your hand pretty close to the ldr in order to affect the light which goes the LDR.I think that the best thing that would the job would be somekind of a "proximity" sensor which is used by some synths to control some parameters.

Thanks for your post Psyche, I think I'll be putting this one on the back burner for now. If I do plan on continuing I'll pick up the post where I've left off.

Cheers,

Chris

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