Correct, the PSU rails are completely separated and they join in the mono blocks. So the connection between C20 and C21 is the star ground in the mono block and from that point the NTC is connected to chassis.
The power supply enclosure is grounded from earth to chassis with a wire, yes.
That's how I did it, there are more ways, obviously. But this resulted in no hum or ground loops.
BTW: I have C20 and C21 in the mono block.
The power supply enclosure is grounded from earth to chassis with a wire, yes.
That's how I did it, there are more ways, obviously. But this resulted in no hum or ground loops.
BTW: I have C20 and C21 in the mono block.
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🙂 mine are just finished, turn on , and 🙂😕😡 one mono is running fine 4mv offset +24 -24 on the VFET and 1.48A running hot but it"s fine.
the second mono block simply don't work seems the REG are out , can't stop crying 😀
the second mono block simply don't work seems the REG are out , can't stop crying 😀
This world cup is a WC...
Hi Juanitox, I m sorry last afternoon with Germany. I hoped you was the best in this WC.
Today our team but is to weak. Who knows.😕
Changing the angle, Did you think about run the amp in class AB?
Best Regards.
Hi Juanitox, I m sorry last afternoon with Germany. I hoped you was the best in this WC.
Today our team but is to weak. Who knows.😕
Changing the angle, Did you think about run the amp in class AB?
Best Regards.
today , i listen to working mono , got great result , 23 V 1.54 A with 7,7V bias the sounds is very straight, no peanut butter , no sirup , fast bass ( a little shy for the moment) , undistorted highs . not as magic as my WE421A but who cares 😀 i must find now what is wrong with the second one and see why i have only 15V after the mosfet reg 
what's voltage at mosfet gates (ref. to gnd) ?
need to be approx. 4V above output ( then mosfet is good )
check zenners (measure voltage across each) and surrounding resistors
need to be approx. 4V above output ( then mosfet is good )
check zenners (measure voltage across each) and surrounding resistors
He is a really fun, thoughtful and nice guy. Could not ask for a better friend on the forum.
He is a really fun, thoughtful and nice guy. Could not ask for a better friend on the forum.
He is, indeed
ZM is always right even i i don't often understand what he says 😀
i have one zener dead on IRFP9240 side and one zener invert on the IRFP240
i prefer waiting new MOSFET before retrying. VFET seems OK with 0,8ohm and DIODE ok on both chips..
i have one zener dead on IRFP9240 side and one zener invert on the IRFP240
i prefer waiting new MOSFET before retrying. VFET seems OK with 0,8ohm and DIODE ok on both chips..
mosfets are most probably good
if you have zenner to put instead dodo one , complete it and try without VFets
if you are getting +/-24V-ish voltage , put VFets in and proceed
if you have zenner to put instead dodo one , complete it and try without VFets
if you are getting +/-24V-ish voltage , put VFets in and proceed
one thing more, with my 25V transfo i have 36V on both rail , a little high for the 35V CAP 😀 i have some 1 ohm 10w resistor where to put it ? just after the rectifier on positive and negative side or on AC sides ?
🙁Dear Juanitox, invest a little money in more safety electrolytic caps. You are driving a Ducati bike with pedal bicycle tires.
The power dissipation would be larger if you put it between the rectifier and capacitor. It would see the ripple as well as the DC. It should be between the two capacitors, to drop DC only.
in fact i have 56000uf on external power supply and 33000uf- O,1R -33000uf in the amp for each rail. and i have 36V on them. so even if i put the 1R in place of the 0,1R the 2 first caps will see 36V again..
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