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Old 1st October 2012, 09:50 AM   #651
AndrewT is offline AndrewT  Scotland
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Have a look at the difference in permitted power handling of the 1943/5200 when operating with supplies of +-40Vdc and +-120Vdc.

I would never use 1943/5200 @ >+-60Vdc
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Old 3rd October 2012, 03:38 AM   #652
mathez is offline mathez  Indonesia
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what hapen with my amp,when first test this amp,whith +56/-56v psu
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Old 3rd October 2012, 08:58 AM   #653
djk is offline djk
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Is there any grease ?

I don't see any.

The sink has scratches, and doesn't look very flat.
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Old 23rd October 2012, 03:02 PM   #654
Shelah is offline Shelah  Zambia
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i didny have much time to read all the posts on this thread. what i just need is help on determining the bias voltage accross r20 and p1 or accross one of the 0.47ohm resistors which gives the 30ma bias current.
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Old 23rd October 2012, 04:31 PM   #655
44250 is offline 44250  Serbia
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What happened with Ohm's law,the one that says:
I=U/R ?
R=U/I ?
U=R x I ?
Why would you be afraid to use it? No reason at all,go for it!
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Old 23rd October 2012, 04:46 PM   #656
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Quote:
Originally Posted by Shelah View Post
i didny have much time to read all the posts on this thread. what i just need is help on determining the bias voltage accross r20 and p1 or accross one of the 0.47ohm resistors which gives the 30ma bias current.
1-connect input gnd to power supply gnd. then check the dc offset.
2-bias adjustment, 10mv across 0.47 emitter resistor .

Last edited by wattaniya; 23rd October 2012 at 04:50 PM.
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Old 23rd October 2012, 05:04 PM   #657
44250 is offline 44250  Serbia
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Quote:
Originally Posted by nazirdigi View Post
1-connect input gnd to power supply gnd. then check the dc offset.
2-bias adjustment, 10mv across 0.47 emitter resistor .
U= 0,01V
R= 0,47Ohm

I=U/R= 0,01/0,47= 0,021 (2765957...) A =21mA

???

For 30mA in 0,47Ohm by mr.Ohm it would be

U= R x I = 0,47 (Ohm) x 0,03(A) = 0,0141V = 14,1mV

Come one,if i know that than it can not be more coplexed than second year of hi-school -why it is so difficult to calculate-not just for you but for many teenagers today? Freaken computers will make a robots from us...

Last edited by 44250; 23rd October 2012 at 05:08 PM.
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Old 23rd October 2012, 05:19 PM   #658
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And those 2n5551 must be put on heatsink with finals and driver.They are part of bias.
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Old 27th October 2012, 08:08 PM   #659
Shelah is offline Shelah  Zambia
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Thanks pipo but I have observed that we have two figures, 14.1mv and 10mv. So which is which here?

And also I have a 44-0-44 toroid transformer in ma possession and I want to use it on the hv23. The dc voltage is lower than the specified 75-0-75 in the hv23. Now the current is what I don't know about. All there is is that two 1mm thick wires were wound as a pair for the secondary. Need help on this as well.
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Old 4th November 2012, 12:57 PM   #660
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hi apex sir,
can i use 500r pot instead 470r pot? because in here 470r pot is not god quality.
if yes what are the changes i have to make?
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