A little help needed.
I built a little psu to power some 5v regs in my DAC.
It is a CCRCC arrangement point to point at the back of the perf board. The psu schematic is a basic CRC arrangement from Peter Daniels thread for tda1543 DAC but I have used 2 caps either side of the resistor to makeup the value
It works fine but...
When I place a finger on each of the caps I can feel the electricity running through the caps - they are quivering - there is no audible hum or noise directly or through the system but I suspect this quivering is polluting the supply?
What is this a symptom of? some grounding issue? dodgy caps? (they are NOS Elna Starget 1000uf 50v)
Thanks for this basic help
I built a little psu to power some 5v regs in my DAC.
It is a CCRCC arrangement point to point at the back of the perf board. The psu schematic is a basic CRC arrangement from Peter Daniels thread for tda1543 DAC but I have used 2 caps either side of the resistor to makeup the value
It works fine but...
When I place a finger on each of the caps I can feel the electricity running through the caps - they are quivering - there is no audible hum or noise directly or through the system but I suspect this quivering is polluting the supply?
What is this a symptom of? some grounding issue? dodgy caps? (they are NOS Elna Starget 1000uf 50v)
Thanks for this basic help
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I very much doubt this, it is much likelier you are feeling vibrations originating in the transformers and being conducted through the board to the caps.
How do you do that? Write 'answer' on a piece of paper and connect the probes to it?
Thanks
I’ll make sure I remedy that
It’s exactly the sort of thing my father the electrician would point out ☺️
I’ll make sure I remedy that
It’s exactly the sort of thing my father the electrician would point out ☺️
Yes! Those trafos are quivering also now that you point it out. Is there an electrical remedy for that? Or is this a mechanical issue where I should add more stand offs to make the board stiffer or dampen those vibrations another way?
I remember now when I put the trafos on the perf board the pins were a real tight fit. So I will demount them both and drill out the holes to ease the pins a little so their direct contact to the board is not so tight. See if that helps.
On a related topic I’ve been using pieces of old mouse mat to isolate transformers in other equipment- not sure if it is exactly sorbathane or if it is having any positive effect - at least it doesn’t appear to have negative impact
On a related topic I’ve been using pieces of old mouse mat to isolate transformers in other equipment- not sure if it is exactly sorbathane or if it is having any positive effect - at least it doesn’t appear to have negative impact
If you can't hear anything (with no music playing
) I wouldn't bother doing any of that- Status
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