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Old 27th February 2010, 03:05 PM   #21
AP2 is offline AP2  Italy
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Hi Apexaudio,
I'm testing an amplifier with complementary 240/9240 similar to yours (not equal)
what is the frequency response at (0dB) on you amplifier.
my post is My idea di MonoBlock esoteric

Regards

Last edited by AP2; 27th February 2010 at 03:09 PM.
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Old 27th February 2010, 03:19 PM   #22
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20Hz-30kHz, THD 0,5 at 240W on 8ohm load.
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Old 27th February 2010, 03:31 PM   #23
AP2 is offline AP2  Italy
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Thanks for info,
before I had the same response (20Hz-30kHz),before any intervention.
I have 0.03% at 230W 8R, think is good.
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Old 27th February 2010, 03:44 PM   #24
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an amplifier that its designed to work with V limmiters in a PA housing with controled ventilation might escape the smoke even if bias is unstable

it might looks thermally unstable as a circuit but it might be stable enough as a complete product ....

Let us not forget that even that even pro amps like QSC dont use a transistor to monitor temperature .... just a simple noisy inexpensive thermistor ...still the get away with it ....

And by the way i also agree on the bias issues and also to my understanding there is no chance that an amplifier like that will keep stable without a zobel, with inductor,and clamp diodes that is missing from your schmtics and pcb ....unless all the above is located else where

Bottom line is if you invest money in a PA or any other big amplifier construction ( since amplifiers like that tent to cost some money ) it would be wise to have all mistakes corrected and use state of the art circuit and semis any way....
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Last edited by east electronics; 27th February 2010 at 03:52 PM.
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Old 27th February 2010, 04:36 PM   #25
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Why anyone have no any coment on unusuall circuit Q8,Q9,R17,R21 and Q7,Q10,R18,R22 in voltage amp... Mosfets IRFP240 and IRFP9240 had integrited clamp diode, R50, C11 are zobel, and inductor is on speakers terminal. On the fotos you can see an amp without fan, make for home listening many years ago. Amp is simple to build and test, work with two output mosfets on +/-50V DC.
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Old 27th February 2010, 05:05 PM   #26
qusp is offline qusp  Australia
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Apexaudio, thanks for sharing, but I think if you expected to come here, put your design on display (and perhaps sell some PCBs) and get universal praise for your design and think that because it has been in use for 10 years that it cant be improved on, you are mistaken. these guys are not criticizing, they are bouncing ideas to improve the circuit around. there are some serious pros here, in general the attitude here is a proactive one, no need to be defensive. if you dont want constructive criticism, I have to wonder why you posted...... take it on board; or not. up to you
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Old 27th February 2010, 05:14 PM   #27
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In last tree years in my PA amplifiers I use new design with 2SA1943/2SC5200 bipolar output tranzistors and IRF2807 mosfets for step. Amplifier work in H class 0,+/-60V,+/-120V.
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File Type: jpg APEX Hclass PowerMON.jpg (185.8 KB, 4101 views)
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Old 27th February 2010, 05:20 PM   #28
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schematic complete atach ?
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Old 27th February 2010, 05:28 PM   #29
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For qusp:
I sharing my expirience about building amplifiers, I do not sale anything. I dont expected anything, if someone is usufull my post , and give some ideas for design thats all.

Last edited by apexaudio; 27th February 2010 at 05:45 PM.
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Old 27th February 2010, 05:37 PM   #30
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For black:
Schematics for APEX MOSFET?

Last edited by apexaudio; 27th February 2010 at 05:44 PM.
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