(Pre-Regulator circuit
http://sound.westhost.com/project102.htm
==========
It must be grounding, so here is the GROUNDING diagram, (as of this first post):
Well, it's not Rod's pre-regulator by it's self.
When this gainclone amp is totaly wired, main (CRC) psu seems to be the source of the hiss (grounding?)......because I tried test powering 1 chip-amp channel from the pre-reg/+15v reg. power taps (instead of the +28v)......there was no hiss at all. The other channel powered by main psu....hiss.
Symptoms:
--loud hiss always, even at lowest volume.
--passes a signal.
Tried:
--removing star grounds (no change).
--moving star grounds to other ground points (no change).
--connecting headphones to preamp output (no hiss heard there).
--moving transformer outside case (no change).
--using lower powered (18v) transformer (no change).
--grounding transformer case.
Did Not Try:
--moving neg. spkr output to another ground place.
--connecting pre-regulator ground to other point shared by main psu ground.
(...I'm so close to being finished!!)
=FB=
http://sound.westhost.com/project102.htm
==========
It must be grounding, so here is the GROUNDING diagram, (as of this first post):
Well, it's not Rod's pre-regulator by it's self.
When this gainclone amp is totaly wired, main (CRC) psu seems to be the source of the hiss (grounding?)......because I tried test powering 1 chip-amp channel from the pre-reg/+15v reg. power taps (instead of the +28v)......there was no hiss at all. The other channel powered by main psu....hiss.
Symptoms:
--loud hiss always, even at lowest volume.
--passes a signal.
Tried:
--removing star grounds (no change).
--moving star grounds to other ground points (no change).
--connecting headphones to preamp output (no hiss heard there).
--moving transformer outside case (no change).
--using lower powered (18v) transformer (no change).
--grounding transformer case.
Did Not Try:
--moving neg. spkr output to another ground place.
--connecting pre-regulator ground to other point shared by main psu ground.
(...I'm so close to being finished!!)
=FB=