Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Need help on a DIY for Guitar Amplifier.

Status
Not open for further replies.

pmadithya

Member level 1
Joined
Aug 30, 2012
Messages
36
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
Bangalore,India
Activity points
1,550
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.

a.jpg
 

barry

Advanced Member level 5
Joined
Mar 31, 2005
Messages
4,986
Helped
1,090
Reputation
2,190
Reaction score
1,074
Trophy points
1,393
Location
California, USA
Activity points
27,289
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

Advanced Member level 4
Joined
Dec 13, 2003
Messages
1,259
Helped
395
Reputation
784
Reaction score
379
Trophy points
1,363
Location
Pakistan
Activity points
7,263

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

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top