Hello,

It looks like you are having trouble with a DC offset on the input of the LM3915.
Could you try a capacitor in series with the input of the LM3915 to block the DC?

Bertus

Ah right ok, ill try that! any particular value or would a 10 micro farrad work?

 

Hello,

Yes, the 10μF will be OK.

Bertus

 

Ah right ok, ill try that! any particular value or would a 10 micro farrad work?

That's weird. I tried a 10 uf and it went back to only affect the top 2 LED's and when I took the cap out and put the input back on pin 5 the pot is acting like the 10k was.

I just did some more testing and its only acting weird when I put a 1kH test tone through it, music seems to be acting as expected. I only tried a 1 kHz tone through it to give me a continuous signal while i adjusted the sensitivity.

 

Hello,

Could you try the capacitor on pin 5 and a resistor of about 10K from pin 5 to ground?

Bertus

 

Hello,

Could you try the capacitor on pin 5 and a resistor of about 10K from pin 5 to ground?

Bertus

Hi Bertus

I tried that and im still getting the same problem. When i turn the pot all the way to the left, should all the LED's go out even when there is signal going in? When I turn it all the way to the right the first 2 LED's light up, but no others. Is this normal behaviour?

 

The good news is its working with guitar, but in order to get all LED'S to light up on hard strums I have to turn the pot most of the way up which leaves me with the first 2 LED's constantly lit.

 

Hello,

Could you place a resistor of 2K2 between pin 2 and 4 of th LM3915 in stead of the wire you have now?

Bertus

 

Hello,

Could you place a resistor of 2K2 between pin 2 and 4 of th LM3915 in stead of the wire you have now?

Bertus

Hi Bertus

Sorry for the late replay. Ive just tried that and all I get now is the first LED constantly lit. The pot now doesn't do anything at all and nothing happens when I put a signal through Pin 5, just the first LED lit.

 

Yes.

Hi there
Thanks, that worked, problem solved. Thanks again