SymAsym5_3 voltage-need help

space2000 · 6th April 2008, 01:12 PM

hi, i need to know SymAsym5_3 dc voltage supply should be 36 v but can i apply 60v on this amp? is there anythings need to change?

need help.
thank you.

MikeB · 6th April 2008, 07:06 PM

Quote:

Originally posted by space2000
...should be 36 v but can i apply 60v on this amp?

In simple words: NO!

Dr.EM · 7th April 2008, 07:46 PM

Since its fairly relevant I should just check, can I use it at +/-30V? With the obvious reduction in power (30-40W instead of 60 into 8ohm?) No stability issue or otherwise unusual behaviour if I drop the supply voltage this little bit (its so I can use it from a regulated supply of that voltage)?

MikeB · 7th April 2008, 07:49 PM

+/-30v is no problem at all.

Mike

space2000 · 7th April 2008, 10:32 PM

hi, i made sysasim5_3 amp. i am having one problem. when i power my amp without any audio input connection, it' makes some type of sound like chiiiii or chi...chi...if i connect cd-player to the power amp input there is no noise. what can i do? only this poblem having when i place the amp into the amp casing.

thank you.

Dr.EM · 7th April 2008, 10:57 PM

Is the amps casing earthed (assuming its metal)? And is the earth joined to circuit ground (direct or via a safety loop breaker)? I get an increase in hissing with the symasym with the input left unconnected, I got it with the P101 too, no unusual noises on either though. Symasym seems quite sensitive to input noise, if I short the input and place it within a few inches of the bridge rectifier a buzzing becomes audible, be careful with the internal layout!

6th April 2008, 01:12 PM	#1
space2000 diyAudio Member Join Date: Mar 2008	SymAsym5_3 voltage-need help hi, i need to know SymAsym5_3 dc voltage supply should be 36 v but can i apply 60v on this amp? is there anythings need to change? need help. thank you.

7th April 2008, 10:32 PM	#5
space2000 diyAudio Member Join Date: Mar 2008	problem with noise hi, i made sysasim5_3 amp. i am having one problem. when i power my amp without any audio input connection, it' makes some type of sound like chiiiii or chi...chi...if i connect cd-player to the power amp input there is no noise. what can i do? only this poblem having when i place the amp into the amp casing. thank you.

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7th April 2008, 07:46 PM	#3
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	Since its fairly relevant I should just check, can I use it at +/-30V? With the obvious reduction in power (30-40W instead of 60 into 8ohm?) No stability issue or otherwise unusual behaviour if I drop the supply voltage this little bit (its so I can use it from a regulated supply of that voltage)?

7th April 2008, 07:49 PM	#4
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	+/-30v is no problem at all. Mike

7th April 2008, 10:57 PM	#6
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	Is the amps casing earthed (assuming its metal)? And is the earth joined to circuit ground (direct or via a safety loop breaker)? I get an increase in hissing with the symasym with the input left unconnected, I got it with the P101 too, no unusual noises on either though. Symasym seems quite sensitive to input noise, if I short the input and place it within a few inches of the bridge rectifier a buzzing becomes audible, be careful with the internal layout!

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