oscillator inside guitar body

[nisios]

A friend of mine asked me to modify hes guitar by putting an oscillator inside the body.
I assembled a 555 variable frequency astable oscillator but as expected i had a lot of bleeding to the ground.
Any tips on how to solve this bleeding problem?
Thanks

[GibsonGM]

It's not really clear what you did, nisios...can you post a diagram?  If you've connected the 555 directly into the signal path, you might experience some weird phenomena - there could be impedance issues.  The way to do that might be by using a LDR/LED combination so the 555 is electrically isolated from the audio signal, and have the whole thing on a DPDT switch....

[nisios]

I connected it directelly but i was aiming to make a blender of the two signals down the road.
The thing is that when i disconnected the 555 output from the circuit i still had alot of oscillation bleeding to the signal....maybe throw common audio\oscillator ground?
Is there any way to correct this? any way of grounding this propperly?
i dont have the circuit with me now....its in my other house where i study and to wich ill go back in the middle of this week.....but as i remeember,  its just a plain simple oscillator sharing ground with the guitar and bleeding alot to the guitar signal at this point.
i stoped experimenting because if i could't even deal with this having the oscillator output disconnected, i didnt even bothered trying to acctualy mix the two signals....for that ill try to impllemento a simple inverting transistor mixer. or an opamp if it gives any more ground noise problems.
I was doing this on breadboard....can this influence much?

[zyxwyvu]

Have you tried the CMOS version of the 555 (ex: LMC555 as opposed to LM555)? It uses a lot less current.

You can also try putting a small resistor between the circuit ground and your guitar ground.

[nisios]

I was using the cmos version here.
Ill have to try that resistor on the ground. What king of values do you sugest?
Im thinking......wouldnt a small inductor do a better job in place of that resistor you are talking about?

[zyxwyvu]

I was using the cmos version here.
Ill have to try that resistor on the ground. What king of values do you sugest?
Im thinking......wouldnt a small inductor do a better job in place of that resistor you are talking about?

I was thinking something like 100R - 1K. An inductor would probably work better, if you can get your hands on one. I suggest trying out different values, or sticking a pot in there, because I'm not sure how much it will affect the sound of the oscillator.

[rocket]

it might also be the pickup picking up the signal (no pun)

[e45tg4t3]

hi there,
try to put a switch between the power supply and the 555, so you can completly turn of the oscillator...
then the bleedtrought shuold be gone^^

Benny