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Forum Index : Electronics : power supply
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| irishron40 Senior Member  Joined: 22/09/2014 Location: IrelandPosts: 251 |
thank you both. great toknow that now. i did download a list with all vallues and numbers, which is great.# thx again ron |
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| robert.rozee Guru  Joined: 31/12/2012 Location: New ZealandPosts: 2350 |
with electrolytic capacitors, it is best not to use one that is rated at a massively higher voltage that what you are supplying. ie, if you're building a power supply with a 12 volt output, a 400v electrolytic is not a good choice. but a 35v one is likely fine. this is something specific to electrolytic capacitors - at significantly lower than the rated voltage the effective capacitance (in uF) will be much less than the marked capacitance. so your 330uF 400v electrolytic capacitor, when hooked up across a 12v supply, may only provide smoothing equivilent to (say) 100uF. please do remember that this applies to electrolytic capacitors only. you are fine using a 100v (or even 1000v) greencap or ceramic capacitor to filter a 12v supply. cheers, rob :-) |
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| davef Guru Joined: 14/05/2006 Location: New ZealandPosts: 499 |
When I started my first job on Christchurch in 1970 a workmate quoted the formula Q=CV as a reason not to use electros with a higher voltage rating than needed. I often wondered how electros could be tested testing electros without any apparent information on the voltage rating. Since wondering if you could really tell if an electro had lost some of its capacity. |
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| irishron40 Senior Member Joined: 22/09/2014 Location: IrelandPosts: 251 |
just like your opinions on meters. i was thinking of using a dual digital volt/amp meter so i can monitor amps drawn. and a separate amp meter for current limiter. would this be a correct setup? thx ron |
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