The third board is the soft-start of the toroid.
I gonna try with connecting all 3 wires to one point on the board.I keep you informed.
I gonna try with connecting all 3 wires to one point on the board.I keep you informed.
Rodeodave said:
Correct. I would like to mention that if you do NOT twist your wires they end up in a loop. And a loop acts as a (loop) antenna, picking up noise, and possibly transmitting noise.
I am glad Rodeodave listed these "twists".
Also, in cases where you do not use shielded cable from the input RCA sockets, make sure you twist the signal and ground here as well.
I hope you will get to fix the problem!
Rolv-Karsten😀
PS. Nice cabinet!
About the inductor I've a air-core of 1,5mH and 1.40mm wire may I use this instead of the iron-core inductor for testingRodeodave said:
Yes, I'd say that inductor should do fine. A solid wire with 1.4mm in diameter can handle a lot of current, so no worries here. The spool should get warm, but not too hot to touch.
I did twist the wires and connect ground to one point but the problem remains but not as loud as before.The next thing is replaycing the inductor.
Sounds good.
Just curious, what is your setup? Like what source do you use (CD, LP,PC,...), preamp and so on. All powered from the same outlet?
Just curious, what is your setup? Like what source do you use (CD, LP,PC,...), preamp and so on. All powered from the same outlet?
That's my second question when I want to test if there's any hum left do I have to connect as in my case a cd player?
Okay,
At first I would short the inputs to ground (shorted RCA plug). This way you make sure that there is no input signal (0V).
Take a look here: http://www.diyaudio.com/forums/showthread.php?threadid=62849.
At first I would short the inputs to ground (shorted RCA plug). This way you make sure that there is no input signal (0V).
Take a look here: http://www.diyaudio.com/forums/showthread.php?threadid=62849.
Twist wires,star-ground and bigger air-inductor still having the hum.
Now I'm gonna dismantle my amp and build it on the table channel by channel.
Now I'm gonna dismantle my amp and build it on the table channel by channel.
Amp rebuild on the table,made star-point with powersupply-ground,output-ground and input ground hearing hum.
Disconnect the input-ground and connect it to the original place a little hum like you're hearing a little transformer humming.
Disconnect the input-ground and connect it to the original place a little hum like you're hearing a little transformer humming.
Hi Nelson,Nelson Pass said:
Did you follow the topic?
I keep having a hum it's not loud but in my mind very annoying.Can I get my amp completly death silent or is that something that I've to live with?
When I connect 2 extra caps the sound lowers is it possible that I've to replace the psu caps?
Greetz
Patrick
Patrick
Where do you hear the hum from? From your speakers or direct from the trafo?
Is your trafo VA enough for class A operation?
Hope this helps
Where do you hear the hum from? From your speakers or direct from the trafo?
Is your trafo VA enough for class A operation?
Hope this helps
The is coming from the speakers.I twist the wires made a grounding point.My trafo is 2x30VAC/500VA.I think I've to look at the PSU because when I move the wires the humming is louder or lesser loud.JC Fardo said:
I'm planning to build the PSU in a seperate housing.
The external PSU is a great idea.
Move the switch, the fuses and the rectifiers to that separate box as well. You could also have some capacitors for additional filtering in that box. This would make something like a CCLC filter. That additional capacitance would also compensate for the 1.5mh instead of the 2mH, but don't be too worried about it. To connect the two boxes you could use XLRs (rated 50V and 16A).
See also the "Top ten ways to a better Aleph?" thread for more ideas.
http://www.diyaudio.com/forums/showthread.php?threadid=12923
Good to see you're still motivated. A dead silent amp is definitely something achievable!
P.S. Sorry to bother you, but for the desired effect you'd need to twist the wires real tight. I usually use a vice and a power drill to twist wires.
Move the switch, the fuses and the rectifiers to that separate box as well. You could also have some capacitors for additional filtering in that box. This would make something like a CCLC filter. That additional capacitance would also compensate for the 1.5mh instead of the 2mH, but don't be too worried about it. To connect the two boxes you could use XLRs (rated 50V and 16A).
See also the "Top ten ways to a better Aleph?" thread for more ideas.
http://www.diyaudio.com/forums/showthread.php?threadid=12923
Good to see you're still motivated. A dead silent amp is definitely something achievable!
P.S. Sorry to bother you, but for the desired effect you'd need to twist the wires real tight. I usually use a vice and a power drill to twist wires.
About the twisting I know you're right but I was a bit laisy.
I make new ones long enough and after twisting give them the right lenght.Why should I put the rectifiers together with the rest of the PSU?What do you think about using an extra inductor of 1mH/1.40mm with the seperate PSU?
Patrick
I make new ones long enough and after twisting give them the right lenght.Why should I put the rectifiers together with the rest of the PSU?What do you think about using an extra inductor of 1mH/1.40mm with the seperate PSU?
Patrick
meanman1964 said:
The wires from/to to the rectifiers carry AC. Of course the wires from the rectifiers to the boards have less ripple-voltage left (before the choke that is), but still, they are running close to the inputs' wires which may pick up noise this way.
And if you want to add some extra caps in the external PSU the rectifier-bridges would have to be there anyway.
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