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Old 10th November 2010, 06:13 PM   #31
Tea-Bag is offline Tea-Bag  United States
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Sure, I have, Woodturner-Fran has. Of course these were all done with the older boards.

use 2-3 2W 20-30R panasonic resistors (narrow leads)

Put IRF's bolted to bigger heatsinks or chassis floor.

Second 100uf cap becomes small MKP type cap of .2 or .1uf, make sure it fits.
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Last edited by Tea-Bag; 10th November 2010 at 06:16 PM.
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Old 11th November 2010, 12:46 AM   #32
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Old 11th November 2010, 01:00 AM   #33
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Old 11th November 2010, 02:14 AM   #34
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Thanks, John

To determine the interest for the Omron relays, I have begun a thread in the Swap Meet.

A set of 7 Omron G6H-2 12V relays can be mailed within North America for $13. Other locations will be priced upon request.

Please express your interest here:

Omron G6H-2 12VDC relays
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Old 15th November 2010, 03:21 AM   #35
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Has anyone hotrod'ed the Mezmerize ?
What's the max current that can be used on this board ?

Thanks,

Davide
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Old 15th November 2010, 04:09 AM   #36
Salas is offline Salas  Greece
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1A, the diodes limit. If having the proper sinks. Up to 200mA is sane and does great with the existing psu caps even.
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Old 18th November 2010, 12:42 PM   #37
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A silly questions (Sorry if these questions are usually recurrent).

How big must be the dissipators for the IRFP240 and 9240?, these mosfets must be matched?. The 7812 needs a dissipator?.

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Old 18th November 2010, 12:47 PM   #38
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A silly questions (Sorry if these questions are usually recurrent).

How big must be the dissipators for the IRFP240 and 9240?, these mosfets must be matched?. The 7812 needs a dissipator?.

Thanks
Hi / hola,

Do you need single heatsinks or dual heatsinks / necesitas disipadores individuales o para los dos mosfets?

Singles heatsinks: http://search.digikey.com/scripts/Dk...56597073549093

Dual heatsinks: http://es.farnell.com/jsp/search/pro...jsp?SKU=150016


Saludos / cheers

Felipe

Last edited by merlin el mago; 18th November 2010 at 12:55 PM.
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Old 18th November 2010, 01:10 PM   #39
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How big must be the dissipators for the IRFP240 and 9240?, these mosfets must be matched?. The 7812 needs a dissipator?.
the easy answers first.
The 7812 does not need a heatsink if the transformer is <=15Vac and only has to supply current for two 12V relays.
I suspect that 5V relays may require a heatsink on the 7812, if the transformer >12Vac.

The mosFETs do not need to be matched. You need 4 in total. They can all be different. But, you must check the voltage across the gate source as it affects the set up of the CCS. If a very high Vgs mosFET were used in a low output voltage Shunt regulator, you may find that swapping in a lower Vgs mosFET may improve performance. At very low output voltages, the shunt mosFET must be replaced by a BJT to eliminate the high Vgs, inherent in a mosFET, from the circuit.

The Power dissipation of the mosFETs is determined by the CCS current chosen, by the transformer Vac chosen and by the Output voltage and Average Output current chosen.

These power dissipation conditions vary between normal operating conditions and various FAULT conditions. The worst case fault conditions do not require the regulator to properly power the client circuit and thus temperatures do not have to be optimum for good performance. You can use survivability temperatures for these extreme worst case fault conditions. I recommend much lower temperatures for normal operation.
These decisions on temperature and the four power determining factors in the previous paragraph will determine what size, if any, heatsink should be fitted to the various mosFETs.

You will gather from this response that no questions are stupid.
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Last edited by AndrewT; 18th November 2010 at 01:14 PM.
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Old 18th November 2010, 03:37 PM   #40
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Thank you AndrewT and Merlin.
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