i only have this preamp now.....b1 buffer still needs to connect all parts and still no chassis yet.
if i turn the volume down to zero and put my ears close to the speaker, i can hear music (from the tuner) beyond the buzzing sound...very strange
buzzing is audible when you put your ears very close to the speaker....say about 2-3inch from the speaker and listen hard
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Buzzing from ac mains is expected with diode bridge and small filter caps, but once amplifier is connected to load it is not noticeable, when music plays. The only way to make it totally silent: 1. to use car batteries 2. to use regulated power supply.
you mean
1)the buzzing sound will always be there if you use mains
2)no way to completely eliminate the buzzing unless you use the two options as suggest by you
but i read many people said (in this forum) that it was completely silent....no back ground noise
1)the buzzing sound will always be there if you use mains
2)no way to completely eliminate the buzzing unless you use the two options as suggest by you
but i read many people said (in this forum) that it was completely silent....no back ground noise
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I have a very small chassis (hey...it was free, so no complain) and wires run besides the transformer. Please see picture
Attachments
yes they are aluminium and metal....i removed the grd wire that connects the main pcb with the chassis and voila...buzzz is gone!
You are not suppose to connect the 'chg' to the chassis!
You are not suppose to connect the 'chg' to the chassis!
With amplifier on you might try just moving wires around, especially signal wires. My last humm was because an signal gnd wire was real close to a signal wire. When separated it went away.
Uriah
Uriah
works fine as well...again without connecting 'chg' to the chassis...thank you everybody.....i love you guys.....you guys are really great
if the buzz has gone when the earth or the chassis ground is disconnected you could try a large 10 ohm resistor from the chassis ground to the case that will also stop the buzz but still ground the boards.
i have a good star ground but the PC i use as source is just too noisy this worked for me although i will change it for a CL-60 NTC later. do not interupt the main safety earth from the socket though that should still be connected to the chassis with nothing between it.
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Hi...thanks. The boards sits basically on the anodized heatsink and so far, i have not notice the heatsink conducts electricity through the chassis.
The other problem is the LED. On one channel it turned off quite quickly (about 1-2 seconds) while the other took about 2 minutes to turn off. It slowly dims until the light dies off. Why?
After listening to them for a few hours now....both amps led dies off at approximately 2 minutes. Not a concern?
I just finished mine. Surprisingly nothing exploded when I turned it on.
I do get 22mV off set on one channel and ~60mV on the other channel. I se a single transformer (The one from Poland recommended in this thread) and no pot.
Should I be worried about the difference in offsets?
I do get 22mV off set on one channel and ~60mV on the other channel. I se a single transformer (The one from Poland recommended in this thread) and no pot.
Should I be worried about the difference in offsets?