Need help on a DIY for Guitar Amplifier.

[pmadithya]

Hi,

I built a Guitar Amplifier for my Box Guitar. I am using a pick up to connect it to AMP.
The problem is it picking up some FM radio signals rather than Amplifying the sound of the guitar. I've added a picture to show the same.

 

[barry]

I'm 99% sure that your problem is your layout. Basically, you've got a high-gain amplifier with an antenna on the input. Use shielded cable for your input, for starters; that will help. That pot across pins 1-8 is a very bad idea, it's another way for noise to get into your amp-use a pot on the input to adjust the gain. Everything should be mounted very close to the chip, not flapping in the breeze like you have it. You may need to use a higher gain configuration, depending on the output of your pickup.

 

[ALERTLINKS]

Put a 10K to 50K resistor on input as shown.