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Author Topic: lm317 low output rock ola 6000  (Read 723 times)

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Offline nusTopic starter

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lm317 low output rock ola 6000
« on: March 17, 2019, 01:48:32 pm »
 so trying to get this psu for a rock ola6000 working, 26v rail is only outputting 2.76v.
So originally the lm317 output was short to ground, it took out he 10ohm 5w resistor on the input, this is all fixed now.
checked the resistors on the output they seem fine, get 2.76v, not sure what to check now, none of the caps seem to be short either.
« Last Edit: March 17, 2019, 03:40:25 pm by nus »
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Offline nusTopic starter

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Re: lm317 low output rock ola 6000
« Reply #1 on: March 17, 2019, 01:51:30 pm »
schematic
« Last Edit: March 17, 2019, 03:36:03 pm by nus »
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Offline nusTopic starter

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Re: lm317 low output rock ola 6000
« Reply #2 on: March 17, 2019, 02:00:37 pm »
MPSA06 is the Transistors
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Offline nusTopic starter

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Re: lm317 low output rock ola 6000
« Reply #3 on: March 17, 2019, 03:51:39 pm »
there is only .6v on the base, nothing on the collector.
resistance is about 5.7k between emitter and collector, when off, in circuit.
i plugged the the 4.7k and and 5.7k in to the lm317 calc, and i get 2.7659, measured and i get 2.76v on the output.
don't really know how transistors work, not sure what i need to do.
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Offline nusTopic starter

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Re: lm317 low output rock ola 6000
« Reply #4 on: March 17, 2019, 03:56:04 pm »
never mind, im dumb. needs base 0v to work
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