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Old 19th May 2004, 06:37 PM   #11
Rixsta is offline Rixsta  United Kingdom
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actualy when youi turn it off the sound fades away distorted and when it's on it sounds realy good
but it's about 5 times quiter than the other channel too!!
somethings not right
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Old 19th May 2004, 07:25 PM   #12
MikeW is offline MikeW  United States
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Something is loose or Q5 is NG.
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Old 19th May 2004, 08:38 PM   #13
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Quote:
Originally posted by Rixsta
when i turn of the power the music stays on for 20 odd seconds (im only using 5000uf capacitors on the power supply)
q1 and q2 seem to be getting warm like they should q5 isnt but it would probably take a while for q5..

as well when i put my multimetre on where it says 42V in the schematic at the source of q5 the voltage takes 5 minuites to drain after iv'e turned the amp off.

or is this normal ?
It's normal. Q5 operates much cooler than 1 or 2. When you
turn the amp off, it will play for a little bit, then when the supply
gets down to about 22 volts, Q1 stops conducting, and the
voltage bleeds off slowly.
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Old 19th May 2004, 09:21 PM   #14
MikeW is offline MikeW  United States
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Does the music stay on, or go off after 20 seconds?
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Old 20th May 2004, 01:22 AM   #15
Rixsta is offline Rixsta  United Kingdom
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Thanks nelson btw this amp sounds amazing im a musician and realy dig it.. lol

when i turn it off i hear the sound for about 3 mins and it only plays the beats of the music like crackly beats....
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Old 20th May 2004, 01:30 AM   #16
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Quote:
when i turn it off i hear the sound for about 3 mins and it only plays the beats of the music like crackly beats....
thats ok, you could simply stop the CD or turn off preamp to avoid it. Did you check both channels for same voltages at the gives measurement points?
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Old 20th May 2004, 01:37 AM   #17
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Quote:
Originally posted by Rixsta
Thanks nelson btw this amp sounds amazing im a musician and realy dig it.. lol

when i turn it off i hear the sound for about 3 mins and it only plays the beats of the music like crackly beats....

I think you still have problem with the voltage regulator. Normally the voltage will pull down to the regulation value and stay there. Once the reg shuts off the amp should stop playing.
If the amp plays for 3 minutes the string of zeners is not setting the reg level. The distortion you hear is from the bias level set for the output. As the vol.tage drops it pulls it and is giving asymetrical clipping.

George
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Old 20th May 2004, 01:47 AM   #18
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R16 back in place?
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Old 20th May 2004, 01:49 AM   #19
Rixsta is offline Rixsta  United Kingdom
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Quote:
Originally posted by Panelhead



I think you still have problem with the voltage regulator. Normally the voltage will pull down to the regulation value and stay there. Once the reg shuts off the amp should stop playing.
If the amp plays for 3 minutes the string of zeners is not setting the reg level. The distortion you hear is from the bias level set for the output. As the vol.tage drops it pulls it and is giving asymetrical clipping.

George

George i have no zeners connected id better replace them with good ones and reconect them right ?
how do i find the exact voltage of a given zener ?

btw exelent discription of whats happening and you make it so i can understand it being only a begginer in electronics

till thanks tommorow i will compare channels

r16 is ok

now theres one last problem i can't figure out why one channel of this amp is 5 times loader than the other..
Could it be linked to the feedback circuit..?
both channels biased at about 1.5 amp

Quote:
thats ok, you could simply stop the CD or turn off preamp to avoid it. Did you check both channels for same voltages at the gives measurement points?
yeah ill turn off my graphic eq first then the amp

im sorry to keep asking for help this will all stop soon.. soon i will be able to enjoy my amp and help other people out
ha ha yeah right.
(im not that clever, but i can make fairly decent music)
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Old 20th May 2004, 11:16 AM   #20
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Quote:
Could it be linked to the feedback circuit..?
yes, if you left out a resistor, took the wrong value, or made a bad connection

Quote:
how do i find the exact voltage of a given zener ?
measure, put in series with a resistor, hook on your power supply, measure voltage across zehner.
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