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13th September 2011, 08:27 PM
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#1 |
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diyAudio Member
Join Date: Dec 2009
Location: Utrecht
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Janus regulator troubleshooting
Hi,
I'm building my first PS, the Janus regulator from Jim Broskie. I only attached the 6.3v heater fillaments to the pcb. On first power-up, after a minute or so, one cap, C11, started to bulge and vent. C12 seems ok. I'm sure the cap's orientation is correct and I don't know how to proceed from here. Any help/suggestions? tnx |
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13th September 2011, 09:26 PM
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#2 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
What is the input voltage and what voltage are the caps ?
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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13th September 2011, 09:34 PM
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#3 |
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diyAudio Member
Join Date: Dec 2002
Location: Calgary, Alberta
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My 1st guess would be that you grounded the heater circuit in more than 1 place, which is a common mistake for newcomers. Could you perhaps outline the different connections you made from the board to your circuit? Measured voltages and component values would help as well.
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari |
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13th September 2011, 10:08 PM
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#4 |
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diyAudio Member
Join Date: Dec 2009
Location: Utrecht
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The 6.3vac (measure 6.5) filaments are connected to pads A and B.
C11 is a 10000uf 16v cap, C12 is the same. The pcb is not grounded anywhere, it's sitting on my table, not connected to anything but the transformer's 6.3vac filaments |
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14th September 2011, 06:04 PM
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#5 |
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diyAudio Member
Join Date: Dec 2009
Location: Utrecht
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Ok, I just put a new cap in and measured the voltages.
Voltage across C12 is 7vdc but the voltage across C11 is -7vdc. C11 blew again after some time. Does that mean the cap's orientation is wrong or can it be something else? tnx for the help |
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