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Old 7th September 2010, 07:54 AM   #621
hadita is offline hadita  Indonesia
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hi Apex.. my second module there is a problem of high noise barrier disposable clip LED LDR but not yet installed( in my place very difficult to provide NSL-32), if this is provoking noise and gain over a rough bass voice also drowned unlike previous modules bass, mid, Hight transparent and smooth bass,,, please provide solution ( sorry the picture not clear )

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First Modul very nice
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second modul problem quality audio not smooth

Last edited by hadita; 7th September 2010 at 08:18 AM.
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Old 7th September 2010, 08:42 AM   #622
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Originally Posted by hadita View Post
hi Apex.. my second module there is a problem of high noise barrier disposable clip LED LDR but not yet installed( in my place very difficult to provide NSL-32), if this is provoking noise and gain over a rough bass voice also drowned unlike previous modules bass, mid, Hight transparent and smooth bass,,, please provide solution ( sorry the picture not clear

First Modul very nice

second modul problem quality audio not smooth
I don't see NE5532, can you post clear pictures, and measure voltages on test point as I suggest for H900. Amp can work without NSL32.
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Old 10th September 2010, 08:00 PM   #623
yohnsee is offline yohnsee  Hungary
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Default Asking for a little help

Hy! Apex, if you are not too busy, could you help me please?
I started to build my amp, first of all, i soldered the protection circuit. I wanted to try it only with giving it 2x18VAC and connecting the BD241 as heat sensor. The fan started to work at 12V, but as i slowly heated the BD241, it remained slow, and sometimes, when i plug the transformer to mains, the relay immediately turns on, and the prot. led isn't working. I checked every resistor before i soldered them in, and every transistor and all the components, now i am stuck. Is it a possible problem, that i used ceramic capacitors for the 0,1uf ones?
And one more thing: If i disconnect one of the AC 18V supply lines, the relay and the fan remains on.

Thanks, and sorry to disturb you
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Last edited by yohnsee; 10th September 2010 at 08:05 PM. Reason: Missing datas
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Old 10th September 2010, 08:49 PM   #624
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Originally Posted by yohnsee View Post
Hy! Apex, if you are not too busy, could you help me please?
I started to build my amp, first of all, i soldered the protection circuit. I wanted to try it only with giving it 2x18VAC and connecting the BD241 as heat sensor. The fan started to work at 12V, but as i slowly heated the BD241, it remained slow, and sometimes, when i plug the transformer to mains, the relay immediately turns on, and the prot. led isn't working. I checked every resistor before i soldered them in, and every transistor and all the components, now i am stuck. Is it a possible problem, that i used ceramic capacitors for the 0,1uf ones?
And one more thing: If i disconnect one of the AC 18V supply lines, the relay and the fan remains on.

Thanks, and sorry to disturb you
Measure voltages +/-15V, and you must have 500mV on BD241C (thermal diode) on 25 deg, and drop 2mV per deg. First comparator (400mV) turn on 24V to fun, and second (350mV) cut out speaker. Measure reff voltages on comparators inputs.
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Old 11th September 2010, 05:15 AM   #625
hadita is offline hadita  Indonesia
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Module who had met yesterday problematic culprit of the problem is the resistor pairs, now B500-2 module to the great sound and bass, mid, treble, transparent, who really just hesitate to make the pole 15volt Zener voltage (-) v 9.7, polar (+) 8.2V ct travo 50V supply voltage difference occurs 1.5v 30a R24/25 2k7/2W whether erosive voltage difference, .. what the risk is on the performance of power ... what part of that must be corrected

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Last edited by hadita; 11th September 2010 at 05:19 AM.
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Old 11th September 2010, 05:18 AM   #626
hadita is offline hadita  Indonesia
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Module who had met yesterday problematic culprit of the problem is the resistor pairs, now B500-2 module to the great sound and bass, mid, treble, transparent, who really just hesitate to make the pole 15volt Zener voltage (-) v 9.7, polar (+) 8.2V ct travo 50V supply voltage difference occurs 1.5v 30a R24/25 2k7/2W whether erosive voltage difference, .. what the risk is on the performance of power ... what part of that must be corrected

greetingListen
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Old 11th September 2010, 07:22 AM   #627
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Module who had met yesterday problematic culprit of the problem is the resistor pairs, now B500-2 module to the great sound and bass, mid, treble, transparent, who really just hesitate to make the pole 15volt Zener voltage (-) v 9.7, polar (+) 8.2V ct travo 50V supply voltage difference occurs 1.5v 30a R24/25 2k7/2W whether erosive voltage difference, .. what the risk is on the performance of power ... what part of that must be corrected

greetingListen
Read phonetically
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Add resistors 2k7/2W in parallel with existing. CCS use voltage on serial conection of two 1N4148 diode, and can work with 8-9V but better go to 15V.
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Old 11th September 2010, 11:01 AM   #628
hadita is offline hadita  Indonesia
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how about the difference between the phase voltage (-) and (+)..? whether there was no influence on the performance of power, because the driver was hot if it was normal ...

thanks
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Old 11th September 2010, 01:21 PM   #629
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how about the difference between the phase voltage (-) and (+)..? whether there was no influence on the performance of power, because the driver was hot if it was normal ...

thanks
MJE340/MJE350 must have heatsink (disipate 0,5-1W). Increase voltage on zeners to 15V with add 2k7/2W, and there will be no difference.
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Old 11th September 2010, 06:35 PM   #630
hadita is offline hadita  Indonesia
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Could sir b500 & H900 combined with the BTL system because I need a large power for field application recomendations please

thanks

Last edited by hadita; 11th September 2010 at 06:41 PM.
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