Purusha
Well-known member
I am using Mnats PSU board for my solid state Neve/Pultec DIY project.
I noticed that the negative side of the PSU output is not stady. You
can also notice this on the LED cause it blinks. The voltage drops to -6V
occasionally and stays there for a few seconds and rises back up to -12V
for few seconds and so on. It looks like the LM337 transistor is overheating
and shutting down from time to time cause it can't handle so much current.
I wired the Pultec by using one side +12V and another -12V to get the 24V
across and didn't use the middle gnd. I am powering 3 LEDs along with 4x24V 5A
relays (SMI-S-224L ) plus two Fabios Neve output driver boards (BA283).
Those two transistors are cooking although I have heat sinks on them so it's obvious
I need to change something in regard those two transistors (LM337, LM317) but what?
1. I could mount another PSU board in parallel after the toroid and split the power
consumption from audio boards to one PSU and relays and LEDs to another. Would this help
to reduce the over heating of the transistors?
2. Another thing is to mount the transistors on the chassis directly to cool them down even more
but I am afraid this would cause a short. Would there be any shorts between the back of those transistors and GND?
3. Or should I find some transistors which can handle 5A? ...any suggestions?
Appreciate any help.
I noticed that the negative side of the PSU output is not stady. You
can also notice this on the LED cause it blinks. The voltage drops to -6V
occasionally and stays there for a few seconds and rises back up to -12V
for few seconds and so on. It looks like the LM337 transistor is overheating
and shutting down from time to time cause it can't handle so much current.
I wired the Pultec by using one side +12V and another -12V to get the 24V
across and didn't use the middle gnd. I am powering 3 LEDs along with 4x24V 5A
relays (SMI-S-224L ) plus two Fabios Neve output driver boards (BA283).
Those two transistors are cooking although I have heat sinks on them so it's obvious
I need to change something in regard those two transistors (LM337, LM317) but what?
1. I could mount another PSU board in parallel after the toroid and split the power
consumption from audio boards to one PSU and relays and LEDs to another. Would this help
to reduce the over heating of the transistors?
2. Another thing is to mount the transistors on the chassis directly to cool them down even more
but I am afraid this would cause a short. Would there be any shorts between the back of those transistors and GND?
3. Or should I find some transistors which can handle 5A? ...any suggestions?
Appreciate any help.