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Old 29th August 2011, 10:27 PM   #1281
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If someone want to use my PCB with protection and indicators, in ZIP file I atached my softwere for calculation.

That sofwere can caluclate power of amp on 4 and 8 ohm, half and full bridge.
Also all values of components on my board.

All you need to do is to write value of power supplay in white box and click calculate, after that, write value of gain that you want (also in white box) and see value of gain resistor and required input voltage.
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File Type: zip Amp calculator.zip (12.7 KB, 423 views)
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Old 5th September 2011, 11:53 PM   #1282
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Originally Posted by pedro1958 View Post
you are estupid you look estupid
haha - even though there is no use in bumping this, I have to say - this made me lol for realz! I love how the meltdown of niceties starts with reindeer!
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Old 6th September 2011, 05:18 AM   #1283
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by Dzony988 View Post
If someone want to use my PCB with protection and indicators, in ZIP file I atached my softwere for calculation.

That sofwere can caluclate power of amp on 4 and 8 ohm, half and full bridge.
Also all values of components on my board.

All you need to do is to write value of power supplay in white box and click calculate, after that, write value of gain that you want (also in white box) and see value of gain resistor and required input voltage.
how about sound and noise ?

Fullrange possibile or only for bass ?
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Old 6th September 2011, 05:55 AM   #1284
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In previous posts I wrote that I dont have a noise and I use amp for full audio. Also I posted PCB and component layout. I resolved problem with noice, see all posts before this..
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Old 7th September 2011, 04:45 PM   #1285
stewin is offline stewin  Kenya
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hi dzony988 the pcb you've shown can it handle +/-90dc 20amps and what is the distortion measurement 0.5% or 1% thd ??

steve
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Old 7th September 2011, 10:30 PM   #1286
CPX is offline CPX  Romania
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Hi.
I have read this thread a couple of times and i decided to try making this amplifier myself.For now i made everything on test board following as much as posible what was discussed in relation to corect pcb making .
I used lorylaci's schematic with added antiparalel mosfets diodes, lm317/lm337 voltage regulators instead of zener diodes , ferite toroid with 1 cm gap and irf540.


I have several issues with it.

1)Large audible distorsions most in mid ranges modulated by low frequencies.
2)Lots of 50hz noise(witch decreases with higher oscilation frequencies )
3)Lots of hiss but manageable with 20x gain
4)Abnormal power consumtion with no load and 10-20khz wave which doesn't happen with 100 hz for example.

Lorylaci's schematic:

Click the image to open in full size.


Residual (visible spikes which increase with load and decrease with added deadtime)

Click the image to open in full size.

20khz visible distorsion begining at ~10 volts before clip level(blue line = supply level)

Click the image to open in full size.


No load square wave spikes(20 khz driving signal)..

Click the image to open in full size.


4 ohm load square wave spikes(20 khz driving signal)

Click the image to open in full size.


Any help highly appreciated.

Thanks

Last edited by CPX; 7th September 2011 at 10:37 PM.
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Old 8th September 2011, 01:40 PM   #1287
savu is offline savu  Romania
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pm me. I can help, I have nr. 2 cores and a functional module.

and I live in cluj also.

br,
savu
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Old 8th September 2011, 07:52 PM   #1288
CPX is offline CPX  Romania
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I reduced some of the distorsions,i had a huge dead time..R3 and R4 were in fact 910 ohm and R2 64 ohm,but now the rezidual wave is extremely spiked.
I will post more test results and scope images soon.
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Old 9th September 2011, 11:25 PM   #1289
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Quote:
Originally Posted by CPX View Post
I reduced some of the distorsions,i had a huge dead time..R3 and R4 were in fact 910 ohm and R2 64 ohm,but now the rezidual wave is extremely spiked.
I will post more test results and scope images soon.
Dont change R3 and R4. They should be adjusted with R2 to give the voltage drop corresponding to the logical 1 level of the IR2110. 120 Ohm with 2k2 values gives 11V, which should be good for supplies of 12-15V for IR2110.

What is your supply voltage?
Your problems are mainly caused by bad layout, due to test board.
Lots of 50Hz noise comes from bad gorund lines. Hiss should be much lower with the given schematic, due to input cap, with a PCb board. Abnormal power consumption could be from oscillation from parasitic stuff.
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Old 9th September 2011, 11:55 PM   #1290
CPX is offline CPX  Romania
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Thanks lorylaci for helping me.

Now the level shifter is okay, i knew about the needed logic level voltages and i tried increasing dead time because of residual spikes.. now r2 is 90ohm, R3,R4 2,2 k...anyway ir2110 accepts up to Vdd+25 for logic 1.

Some rf noise gets into lm311 negativ input throught feedback wire..shielding it has helped somewhat. but white noise still increases with output voltage.

I still have a lot of feedback errors :no load/1.5 ohm load results in up to 5 volt rms drop and shape distorsion.Strangely enough this efect is reduced if i increase switching frequency..but at 600khz the power transitors are frying

At 20khz input signal and no load i have peak output greater than supply rails..is this what you called bus pumping?

Tested up to +-42(full load),2 ohm load and ~ 9 amp rms output..after that point output transitors have blown..audible output distorsions are starting after 2 amp ...

I will try shielding output coil and see if that helps..i am starging to run out of ideas..

Last edited by CPX; 10th September 2011 at 12:15 AM.
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