Bare Knuckle Pickups Forum

Forum Ringside => Tech => Topic started by: sgmypod on June 26, 2011, 07:09:52 PM

Title: Negative feedback
Post by: sgmypod on June 26, 2011, 07:09:52 PM

Been using my mates champ sounds a little sweeter than mine was wondering if I could change mine to more champ like by changing negative feedback part of it am guessing is part ringed in my pic

Title: Re: Negative feedback
Post by: HTH AMPS on June 26, 2011, 08:26:07 PM

you'll have to remove the bypass cap from the 1K resistor if you want to use NFB.

alternatively, you could add a 470ohm resistor in line with the existing 1k/0.1 combo to ground and insert the NFB there (thats the way I'd do it).

Title: Re: Negative feedback
Post by: sgmypod on June 26, 2011, 09:16:06 PM

ahh thought already had NFB as there connected to the grounding tag

Title: Re: Negative feedback
Post by: HTH AMPS on June 27, 2011, 05:32:52 PM

looks like you have a DI out there, right? - a schematic would be easier to read, I hate layouts.

Title: Re: Negative feedback
Post by: jpfamps on June 27, 2011, 08:53:19 PM

Can't see any evidence of negative feedback around the power stage.

As HTH says, it looks like a DI out.

Title: Re: Negative feedback
Post by: sgmypod on June 27, 2011, 10:34:17 PM

Here is schematic...didn't think I had this

Title: Re: Negative feedback
Post by: jpfamps on June 28, 2011, 11:14:48 AM

Yep, no negative feedback.

Title: Re: Negative feedback
Post by: sgmypod on June 28, 2011, 11:35:33 AM

Is it possible to do frank (been a while since touched an amp)

Title: Re: Negative feedback
Post by: HTH AMPS on June 28, 2011, 05:41:14 PM

its possible - follow the instructions in my post above.

actually, I've drawn up an alteration to your schematic.

oh, and use a 47ohm resistor, not 470ohm as I said earlier.

Title: Re: Negative feedback
Post by: sgmypod on June 28, 2011, 10:06:04 PM

so main difference is adding 47ohm resistor(to ground inbetween bit I highlighted originaly) and the 33k feedback resistor to the 16ohm output going to headphone di

what wattage do I need on these