Hi Ale
maybe i shall tell how my hifi is
i use a LS9 line Array speaker...
i same box i have my DDdac 1794..and Groundsound digital filter
the Groundsound give signal to my Groundsound bass amp
and the Groundsound give signal to my Encore amp who drive my Tweeter
from the DDdac the signal goes to the 4P1L
From the 4P1L signal goes to Groundsound filter
my sekundare winding have no connetion to ground (Lundahl 2745)
picture come later
best Bjarne
maybe i shall tell how my hifi is
i use a LS9 line Array speaker...
i same box i have my DDdac 1794..and Groundsound digital filter
the Groundsound give signal to my Groundsound bass amp
and the Groundsound give signal to my Encore amp who drive my Tweeter
from the DDdac the signal goes to the 4P1L
From the 4P1L signal goes to Groundsound filter
my sekundare winding have no connetion to ground (Lundahl 2745)
picture come later
best Bjarne
???
It's too much.
At least one orders of magnitude greater, than what I measured in my #26 preamp R.C. regulator (1A heater current, -10V on the bias resistor).
Hi Bjarne,
Yes, Bela is right, 3mV is too much.
The rectifier and caps of filament supply must be near the transformer. This is important for low noise.
If they are moved to the transformer chassis (best), please add 1000uF 35V to the Regulator input - right on the PCB.
Cables to the output - maybe these need to be shielded too.
Yes, Bela is right, 3mV is too much.
The rectifier and caps of filament supply must be near the transformer. This is important for low noise.
If they are moved to the transformer chassis (best), please add 1000uF 35V to the Regulator input - right on the PCB.
Cables to the output - maybe these need to be shielded too.
Have remove rectifier and caps to trafo.. one resistor and caps near the Colman regulator
no change in noise
have messure ac on Coleman--my Agilator instrument show 0.4mv ac--the other instrument show 2.3mv ac---
have the noise something to do with the Lundahl trafo....i have once use a trafo on my kkdac ,,,there was hum ..
Best Bjarne
no change in noise
have messure ac on Coleman--my Agilator instrument show 0.4mv ac--the other instrument show 2.3mv ac---
have the noise something to do with the Lundahl trafo....i have once use a trafo on my kkdac ,,,there was hum ..
Best Bjarne
The input RCA plugs seem to be grounded to the case and not to star ground. The idea behind star grounding is to create a point that is considered to be at 0,000 volt. All small currents return to this point, all large currents and other noisy sources too. Sometimes (in a large build) one can combine certain routes that don't bite each other, like in this example:
If you don't find a quick fix to the problem you're experiencing (was it humm?) I recommend starting all over again and beforehand think out the important placement of components. Filament supplies must be close (within 8cm), heat must not warm up nearby components. Do not combine 'busy' wires and signal wires in one cable etc etc.
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If you don't find a quick fix to the problem you're experiencing (was it humm?) I recommend starting all over again and beforehand think out the important placement of components. Filament supplies must be close (within 8cm), heat must not warm up nearby components. Do not combine 'busy' wires and signal wires in one cable etc etc.
I keep a 10cm x 15cm piece of thin (~1mm) steel that is completely double wrapped with plastic packing tape around to test for magnetic induction hum in input and output transformers. With the piece of electronics in question powered and connected into an audio system I place the steel in between suspect power transformers or chokes and the audio transformer to see if the hum is reduced substantially. If it is, then I've found the problem and can devise a permanent magnetic shield or move one of the actors in the hum drama. The packing tape wrap keeps you from making unwanted sparks in a live circuit!
After rectifire on high volt--resistor...470uf ---resistor ..470uf...resistor ..68uf...and close to Maida regulator 0.33uf
i will check manual for Maida ones more....i have plus to Lundahl trafo,,,,and minus to star ground
I use only one trafo for Coleman regulator...seperate windings---is this very bad ??
best bjarne
i will check manual for Maida ones more....i have plus to Lundahl trafo,,,,and minus to star ground
I use only one trafo for Coleman regulator...seperate windings---is this very bad ??
best bjarne