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Old 26th February 2013, 12:47 PM   #431
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Nice work Permaneder !

Cheers.

Si.
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Old 26th February 2013, 01:30 PM   #432
Rush is offline Rush  United States
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Quote:
Originally Posted by permaneder View Post
Hi Rush,

First, the preparation work is already done by my boards supplier. Modifications now would cost additional EUR 45 at least.

Second, it would be necessary to considerably enlarge the boards’ sizes to guarantee a certain space between the MOSFETs to avoid thermal issues. More area = more money.

So, if you really want more current, I suggest to point-to-point wire the additional transistor(s). Be careful to solder the gate stopper resistors very close the transistors’ legs. There is no need to double the small capacitors and Zeners at the drains and sources yet.

Another solution might be the use of IRFP140/IRFP9140 (31A/21A)for example for more current.

Georg
Georg,

You have done a great job and more current is not what I am after when I asked if you had doubled up the number of regulators.
What I meant was, that with only a plus and minus on one board at $20 each (or whatever) we could get a lower cost per regulator if we made a larger board with 2 plus and 2 minus regulators on it so we could cut the board in half if we wanted to have two mono amps. The cost of one larger board with 4 regulators is less expensive than buying 2 boards with only 2 regulators on them.

Sorry for the confusion,

Rush
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Old 26th February 2013, 02:01 PM   #433
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Georg,

You have done a great job and more current is not what I am after when I asked if you had doubled up the number of regulators.
What I meant was, that with only a plus and minus on one board at $20 each (or whatever) we could get a lower cost per regulator if we made a larger board with 2 plus and 2 minus regulators on it so we could cut the board in half if we wanted to have two mono amps. The cost of one larger board with 4 regulators is less expensive than buying 2 boards with only 2 regulators on them.

Sorry for the confusion,

Rush
Rush,

Sorry for my misconception.

The costs for one dual mono set consisting of two +- regulator boards will be EUR 16 approximately. The quotation for the whole set on one board differs by less than EUR .30 (and I am not quite sure, whether my Czech suppliers really understood my question... ).

Expect a price in the range of EUR 22 for one stereo amp boards set (2 amp boards).

Georg

Last edited by permaneder; 26th February 2013 at 02:11 PM.
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Old 27th February 2013, 01:48 PM   #434
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What's the effect of the regulators compared to a classic CLC power supply?

Example (simulation with PSUD2):
-With only a cap of 66mF you get about 600mV of ripple.
-With a CRC of 33mF-0.12ohm-33mF you get about 200mV of ripple.
-with a CLC of 33mF-5mH-33mF you get about 10mV of ripple, that's 20 times less compared to a CRC.

So where does the regulator fits in ?
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Old 27th February 2013, 03:36 PM   #435
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What's the effect of the regulators compared to a classic CLC power supply?

Example (simulation with PSUD2):
-With only a cap of 66mF you get about 600mV of ripple.
-With a CRC of 33mF-0.12ohm-33mF you get about 200mV of ripple.
-with a CLC of 33mF-5mH-33mF you get about 10mV of ripple, that's 20 times less compared to a CRC.

So where does the regulator fits in ?

I do not simulate – too old and dumb…

A few years ago I measured the regugulated supplies with an oscilloscope and a Fluke 189 multimeter (combined DC and effective AC measurement). The load capacitance was 22mF, the buffer capacitance at the regulated outputs a second 22mF cap. Vout was 24V @ 2A load current as far as I remember.

There was no ripple visible.

The regulators are death quiet and very dynamic. I prefer them over any passive supplies including CLC.
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Old 27th February 2013, 06:14 PM   #436
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OK thanks,
that's good enough for me, so regulated it will be
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Old 28th February 2013, 06:37 PM   #437
zoe is offline zoe  United States
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What transformer should I buy for this amp and regulator?
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zoe
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Old 28th February 2013, 06:51 PM   #438
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What transformer should I buy for this amp and regulator?
300VA 2*22V per channel
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Old 28th February 2013, 10:42 PM   #439
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Is 2*22 VAC per channel not too much ? Is 2x19 VAC not better ?

In my F5 I have a 500VA 2x18 transformer that gives me rails of 23vdc after the CLC.
If the regulators drop the voltage 4v then 2x19vac looks perfect.
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Old 1st March 2013, 06:25 AM   #440
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Is 2*22 VAC per channel not too much ? Is 2x19 VAC not better ?

In my F5 I have a 500VA 2x18 transformer that gives me rails of 23vdc after the CLC.
If the regulators drop the voltage 4v then 2x19vac looks perfect.
You'll need at least 8V over the wanted regulated Vout @ full load current for a stiff supply. Even more, if your transformers are not proper dimensioned. The bigger the iron, the better.

Last edited by permaneder; 1st March 2013 at 06:29 AM.
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