900W H-class PA Amp with Limiter

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#2,881
marestiani said:
i do this for testing Mr gantex
1. I use 1 transformer with 45 40 0 40 45 Vac with 10000/80V capasitor
2. i use 2 trafo with each secondary 42 0 42 and 45 0 45 but one of the diode got hot, i think this fail or one of my transformer broken (old transformer) with same 10000/80V capasitor
3. now i testing with toroid transformer 45 32 0 32 45 Vac with 8 6800/63V capasitor and 2 fake 35A fake motorola diode 😀 n the result is like this picture are this normal?
i'm finishing build H900 in december but i power up H900 this week 😀
i'm very courious to build this psu, may be my multimeter got broken too, cause several days ago i got wrong measurement
Click to expand...

So what trafo u use now. nothing wrong with scheme. but, are u sure 32vac get 45vdc?
where diode goest hot at the pic u upload? are u check this diode with multitester?
 
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#2,882
bimo said:
DC voltage = 1,414 * AC voltage (Diode bridge forward voltage don't count, no load condition).
If you have 45 32 0 32 45 trafo, you must have aprox. +63 +45 0 -45 -63 dc voltage. You can not change the physic of law 😀.
Please measure all voltage with ground as reference. If you measure DC voltage, set the multimeter for DC voltage and if you measure AC voltage, set the multimeter for AC voltage.
Click to expand...

than that's correct i get approx +60 +45 0 -45 -60 VDC cause i use analog multimeter can't see like digital and yes i test with ground reference with correct setting multimeter and the result as picture also without load, thanks mr. bimo

gantex said:
So what trafo u use now. nothing wrong with scheme. but, are u sure 32vac get 45vdc?
where diode goest hot at the pic u upload? are u check this diode with multitester?
Click to expand...

i use only 1 toroid transformer right now with 45 32 0 32 45 Vac for testing like the picture i upload, the diode get hot when last week i use 2 transformer combine 10A toroid and 10A regular transformer 😀 for testing, i have 3 toroid n 1 regular transformer from my old amplifier for testing, but never try combine 2 toroid transformer, there is nothing wrong with the sceme but the result in my testing make me confuse😕 😀, build H900 with less problem but get problem when built it psu 😀
 
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#2,883
marestiani said:
than that's correct i get approx +60 +45 0 -45 -60 VDC cause i use analog multimeter can't see like digital and yes i test with ground reference with correct setting multimeter and the result as picture also without load, thanks mr. bimo



i use only 1 toroid transformer right now with 45 32 0 32 45 Vac for testing like the picture i upload, the diode get hot when last week i use 2 transformer combine 10A toroid and 10A regular transformer 😀 for testing, i have 3 toroid n 1 regular transformer from my old amplifier for testing, but never try combine 2 toroid transformer, there is nothing wrong with the sceme but the result in my testing make me confuse😕 😀, build H900 with less problem but get problem when built it psu 😀
Click to expand...

why confuse?
if your result same as the picture. i think anything is rite. or u can try use another multitester just to make sure psu are correct.
 
#2,885
Class TD/Eeengine amplifier under simulation.

Blue trace is the output signal
Green is the supply voltage of the output devices
Red is the output of the class D output voltage.

Sajti
 

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#2,889
The share of high-frequency components in the real signal is small, so the envelope is formed mainly low and middle frequencies. High frequencies are well practiced G-class tracker, which is an ancillary element.
We worked at a club with such a device, the sound was good.
 
#2,891
waso said:
The share of high-frequency components in the real signal is small, so the envelope is formed mainly low and middle frequencies. High frequencies are well practiced G-class tracker, which is an ancillary element.
We worked at a club with such a device, the sound was good.
Click to expand...

The HF drivers need not too much power, so we can use class AB, of modulated rail class H for the HF.

Sajti
 
#2,894
update with my h900 adding 1 transformer 15amps each channel..
and pls. help. how much power that i can get in 8ohms load using 80-40-0-40-80 ac 15amps
http://postimg.org/image/h7bzuqvw7/

An externally hosted image should be here but it was not working when we last tested it.

View image: DSC 0784

An externally hosted image should be here but it was not working when we last tested it.

View image: DSC 0785

An externally hosted image should be here but it was not working when we last tested it.
 
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