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Old 4th May 2012, 05:47 PM   #441
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Quote:
Originally Posted by alkasar View Post
Your amp will not be able to use the full 78V, because the available current from power supply will be limited first.
PS storage caps will allow brief bursts at full voltage; add more for less briefness
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Old 4th May 2012, 06:04 PM   #442
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Quote:
Originally Posted by noah katz View Post
PS storage caps will allow brief bursts at full voltage; add more for less briefness
I've got 65,600uF total (32,800uF for each L25D). Hopefully that's sufficient.
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Old 5th May 2012, 09:13 AM   #443
luka is offline luka  Slovenia
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Quote:
Originally Posted by DarpMalone View Post
I've got 65,600uF total (32,800uF for each L25D). Hopefully that's sufficient.
about 10 times too much with smps, and still too much even if you use 50-60hz transformer... but it never hurts to have it like that
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Old 5th May 2012, 02:37 PM   #444
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I'm using a linear PS... I know that too much capacitanceis a no-no in SMPS, but in a linear supply would this amount have a negative effect or is it just a matter of diminished returns beyond a certain pt.?
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Old 5th May 2012, 08:11 PM   #445
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by DarpMalone View Post
I'm using a linear PS... I know that too much capacitanceis a no-no in SMPS, but in a linear supply would this amount have a negative effect or is it just a matter of diminished returns beyond a certain pt.?
The inrush current of too much capacitance can damage the rectifier diodes, but I doubt that will be a problem in your case.

Back in the old days I built a capacitor bank for an old Dynaco Stereo 150 amp that was as big as the amp itself using old Caps from computer mainframe power supplies. I had to build a soft start circuit to avoid the inrush damage.

I went looking for an inrush calculator to look smart, but the formula I found needed an inductive component, and I didn't feel like digging any further

Last edited by MrSlim; 5th May 2012 at 08:14 PM.
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Old 5th May 2012, 09:39 PM   #446
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Gotcha... I read that somewhere in this forum... I've also purchased a soft start module from Connex electronic, so I'll be alright.

Thanks!
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Old 7th May 2012, 06:22 AM   #447
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Hi,cand someone mesure the
AC (residual) on output ,without input signal!
I have 70mV (is that OK?) on my amps L25D switching @300Khz
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Old 11th May 2012, 05:11 PM   #448
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by ionutzxpo View Post
Hi,cand someone mesure the
AC (residual) on output ,without input signal!
I have 70mV (is that OK?) on my amps L25D switching @300Khz


The L25D you can set the operating frequency.

I usually designed to 420K HZ, .. on the PCB resistor nominal 470OHM.

470 the R = 650K
390 the R = 550K
300R = 420K
The higher frequency allows the residual PWM sine wave output to reduce the voltage value.
But may produce distortion THD switch, and more heat.

It can be set arbitrarily. I recommend the 300R, the PWM = 420K. Reference IRAUDMP7
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Old 12th May 2012, 03:38 AM   #449
vakkuj is offline vakkuj  Singapore
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Hi,

Finally i have got these from Taobao store through my friend, assembled all the parts.
Attached is the photo of the items i have purchased.

Could someone please give me wiring instructions to do with the attached boards. My Speaker is a 6 Ohm speaker. Should i make any changes ?

And what should be the transformer ratings, how many core ?

1. For Amp. Is it 22 - 0 - 22 Volt , How much should be current rating ?

2. Delay board + Protection board - Voltage ?

3. Mini Preamp What should be voltage ?

Thank you...


Click the image to open in full size. Uploaded with ImageShack.us

Last edited by vakkuj; 12th May 2012 at 04:05 AM. Reason: Image link not working.
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Old 12th May 2012, 05:49 AM   #450
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@vakkuj your questions show you have no idea what you are doing and or are too lazy to read the information off the circuit boards and find the wiring information in this thread or on the many ebay pages and others that sell these boards.

I am not going to help you electrocute yourself or start a fire.
You need to do your homework.
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