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Old 7th February 2013, 10:08 PM   #311
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Quote:
Originally Posted by suryadi5417 View Post
MR. Mile,can I use 74HC00 instead 74AC00 without any changes ?
it is hard to find 74AC00 in my local store.

Regards.
Yes, use 74HC00 without any changes.
Regards
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Old 9th February 2013, 12:15 PM   #312
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Angry irs3000 problem!!!

Quote:
Originally Posted by andrewlebon View Post
SAEED try IRS 3000 tested gaurentee to please you
hi andrew
i tried irs3000. unfortunately it has problem just like what IRS said
oscillation can't start without input signal and its LED also is off
every thing is just like Mr IRS video
whats this problem for?
its assemble problem or design?
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Old 12th February 2013, 10:43 AM   #313
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i tried D200 yesterday, its happy to say it works
it's Mackie SRM450 active speaker amp with a change in level shifter and designed base on IRAUDAMP1.
this topography needs to be under load and a input triger to start oscillation at first and in a active speaker like SRM450 there is no problem, because the driver is always connected to the amp but for general use it needs a load resistor as permanent.
i used a 1k/2W resistor and it seems proper.
as apex said uf4004 had to change with BAV21 or MUR120.
Note that frequency 430KHz is obtained by the using IRFB31N20D as output transistor and it change by changing the transistor
for IRF640N the frequency is about 170KHz that is not good enough.
the 510ohm resistor(R183) can control the frequency (just like what R27 do in IRAUDAMP1) and u can change it by a 5kohm variable pot to set the frequency.
as u can see i use IRF640N and set the frequency to 413KHz.
the output pwm is not quite sharp and excellent but Fortunately its stable enough and not a overshoot edge.

Regards,
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Old 12th February 2013, 12:50 PM   #314
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Quote:
Originally Posted by SAEED JOON View Post
i tried D200 yesterday, its happy to say it works
it's Mackie SRM450 active speaker amp with a change in level shifter and designed base on IRAUDAMP1.
this topography needs to be under load and a input triger to start oscillation at first and in a active speaker like SRM450 there is no problem, because the driver is always connected to the amp but for general use it needs a load resistor as permanent.
i used a 1k/2W resistor and it seems proper.
as apex said uf4004 had to change with BAV21 or MUR120.
Note that frequency 430KHz is obtained by the using IRFB31N20D as output transistor and it change by changing the transistor
for IRF640N the frequency is about 170KHz that is not good enough.
the 510ohm resistor(R183) can control the frequency (just like what R27 do in IRAUDAMP1) and u can change it by a 5kohm variable pot to set the frequency.
as u can see i use IRF640N and set the frequency to 413KHz.
the output pwm is not quite sharp and excellent but Fortunately its stable enough and not a overshoot edge.

Regards,
What is rail voltage on your amp?
Regards
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Old 12th February 2013, 01:14 PM   #315
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Quote:
Originally Posted by apexaudio View Post
What is rail voltage on your amp?
Regards
its about -/+47v dc
PG0208 core from Behringer amp is working better on this amp as you said.
T106-2 red clear core warm up a little in this frequency.

regards,
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Old 12th February 2013, 01:52 PM   #316
lycanlk is offline lycanlk  Sri Lanka
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Thumbs up Amp works

I assembled carefully. It worked at once.

Tested without a heatsink so I couldn't run so long. FETs heat up quickly.

Used 16 ohms loudspeaker for the test. I did not increase the input volume as no heatsink on FETs

Supply voltage: +/- 40
Outputs: IRF640N
used: BAV21, T106-2 filter. 10R/5W, 2K2/5W, BD241C 400v rated capacitors at output stage. paralleled 2 x 0.1ohms/2W resisters to get 0.05ohms,

I couldn't find 510R resister so combined 390R + 120R.

** May be too many turns on T106-2. I'm gonna reduce and test later.

Everything is cool except outputs. I need to minimize the heat and increase the voltage upto +/-90. So need your help.

So far, the best class D amp I have tested!!!
Thanks Apex

** One more thing: The PCB is too much tidy up. Output stage needs more space to assemble. Mounting components are not easy specially the heatsink on FETs. I appreciate if you can re-design that area and publish the layout for us please.
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Old 12th February 2013, 02:30 PM   #317
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Quote:
Originally Posted by SAEED JOON View Post
its about -/+47v dc
PG0208 core from Behringer amp is working better on this amp as you said.
T106-2 red clear core warm up a little in this frequency.

regards,
I also use some EE and ETD cores with gap, what about sound?
Regards
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Old 12th February 2013, 02:45 PM   #318
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Quote:
Originally Posted by lycanlk View Post
I assembled carefully. It worked at once.

Tested without a heatsink so I couldn't run so long. FETs heat up quickly.

Used 16 ohms loudspeaker for the test. I did not increase the input volume as no heatsink on FETs

Supply voltage: +/- 40
Outputs: IRF640N
used: BAV21, T106-2 filter. 10R/5W, 2K2/5W, BD241C 400v rated capacitors at output stage. paralleled 2 x 0.1ohms/2W resisters to get 0.05ohms,

I couldn't find 510R resister so combined 390R + 120R.

** May be too many turns on T106-2. I'm gonna reduce and test later.

Everything is cool except outputs. I need to minimize the heat and increase the voltage upto +/-90. So need your help.

So far, the best class D amp I have tested!!!
Thanks Apex

** One more thing: The PCB is too much tidy up. Output stage needs more space to assemble. Mounting components are not easy specially the heatsink on FETs. I appreciate if you can re-design that area and publish the layout for us please.
FETs and BD241C must have heatsinks. D200 is made as first class D amp for test and expirience, I will made new amp (pcb).
Regards
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Old 12th February 2013, 03:26 PM   #319
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Quote:
Originally Posted by apexaudio View Post
I also use some EE and ETD cores with gap, what about sound?
Regards
sound is good. It seems to have a good frequency response because of 400Khz pwm. no distortion can be heard even in high frequency and low frequency response is so good.
output transistors works cool after 3 hours work under 4ohm load and it means good switching
i still haven't the frequency response for better analyze but i'll get it.

i used ETD and RM type before for other d-class amp but they are not as good as toroid cores. i think output sound of toroid cores is warmer. (it's just my experiment)
most professional designers i've ever seen (like QSC crown or Mackie) also use toroid type cores.
what type u use?

what do you think about protection, this protection is good in over current fault occurs by speaker but i think if the output connected to any other ground (like shielded buddy ) and over current fault happen, it will not work,
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Old 12th February 2013, 03:52 PM   #320
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Quote:
Originally Posted by SAEED JOON View Post
sound is good. It seems to have a good frequency response because of 400Khz pwm. no distortion can be heard even in high frequency and low frequency response is so good.
output transistors works cool after 3 hours work under 4ohm load and it means good switching
i still haven't the frequency response for better analyze but i'll get it.

i used ETD and RM type before for other d-class amp but they are not as good as toroid cores. i think output sound of toroid cores is warmer. (it's just my experiment)
most professional designers i've ever seen (like QSC crown or Mackie) also use toroid type cores.
what type u use?

what do you think about protection, this protection is good in over current fault occurs by speaker but i think if the output connected to any other ground (like shielded buddy ) and over current fault happen, it will not work,
Hypex and clones did not use toroid type cores
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