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Juani_12-5 24th December 2006 08:41 AM

Hi, I need to find a SMPS schematic that work properly, to make an amplifier for a Lanzar Max 10'' SVC woofer... I've already tested the one from but it doesn't work as it is suposed to.
So I was wondering if someone of you that have already tested any SMPS that work properly can help me giving me the schematics and if it is possible the PCB...
Thank you for helping me...

luka 26th December 2006 08:09 AM

I can't see shema, but I and many other have build this one

Juani_12-5 26th December 2006 02:50 PM

Thank you...
I am interested in the caracteristics and how can I make the 100uH coils and the toroid... Someone can tell me the number of turns (primary, secondary, etc), the donuts dimensions, the wire...?

luka 26th December 2006 05:17 PM

It all depends on your needs, how large toroid might be, wire(how many in parallel), as for number of turns, it also depends on output voltage, is it regulated or not....

sachserjuris 14th January 2007 09:02 PM

very good valveaudio
Hi dears

I built the valveaudio smps version and it worked fine. I use 12 FQP50N06, BC547/557 drivers, 2" outer diameter toroidal core, 4+4 and 20+20 windings, in regulated mode +43/-43V, if no-regulated +65/-65V, the pics are here:



E007 15th January 2007 03:33 AM

2 Attachment(s)
HI, here is a schematic and it works nice.

sachserjuris 16th January 2007 06:50 PM

Good looks

Do you have pics of your SMPS construction/building...(::)

Perry Babin 17th January 2007 10:05 AM


If you're using pin 4 for soft start, install a schottky diode (low forward breakdown voltage) from pin 4 to ground (cathode to pin 4). This prevents pin 4 from dropping too far below ground if the 5v output drops too quickly. This can happen if the B+ drops too quickly. When the voltage on pin 4 gets too far below ground, the outputs will stop switching. One will go to ground and one will go to B+. It can blow the FETs in a fraction of a second.

E007 20th January 2007 09:15 AM

Perry Babin:

i got your mean, but the +B will not drop too fast, cuz there are 4 pcs 1000uf/16v cap in parallel with +B . and also there is a 2M ohm 1/8w resistor in pareallel with the 100uF/25V capacitor between vref(5V) and pin 4.


i'll post pics later.

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