Call the circuit designer and ask specific questions about specific capacitors in the circuit design. Definitely mention specific capacitor candidates that you propose to use. Since you've posted in the "D-Noizator" thread, where (a) the identity of the circuit designer is known with perfect certainty, and (b) that person is easily accessible, it won't be especially difficult.
Thre is no simple and direct answer to the question: everything depends on the exact specifics.
Very high performance polymer caps offer better performance, but only if they are used in the right way and context.Otherwise, they wiill be detrimental and cause problems.
If you don't know exactly what you are doing, use "easier" caps having a non-negligible ESR: the denoiser will still work satisfactorily, but without stability issues
Very high performance polymer caps offer better performance, but only if they are used in the right way and context.Otherwise, they wiill be detrimental and cause problems.
If you don't know exactly what you are doing, use "easier" caps having a non-negligible ESR: the denoiser will still work satisfactorily, but without stability issues
Thanks. I'm building test PCBs so I can make this circuit into small bite size pieces I can digest easily. You have to walk before you can run?
Regards, Dan
😉
Regards, Dan
😉
I've been jumping around this thread a bit before settling on Trileru's generous offering in post #2474. I'm building the first half to tinker with and see if I can grasp some of the design and adapt it to my 'needs'. Well beyond my training and education but that doesn't stop me from having fun.
Regards,
Dan
Regards,
Dan
L1 most likely won't be required, but footprint might be useful to correct C4 ESR in case you have only low ESR caps. C4 should be around 0.2R ESR. You can also use 100uF-470uF depending on what you can find with that ESR, but have at least 100uF.
You could also add a 22uF-47uF cap between your TP1 and GND for some extra PSRR.
If you want the full 1.5Aout of LM317 you need around 13.5-14VAC transformer secondary voltage, and at least 2200uF for each C1 and C2 in your schematic. Bridge should also be up to par. Bellow schematic is for 12Vout.
Could probably work for LM337, but I think the whole point of the exercise is to eventually add a denoiser on TP1, to make for a NoNoiser. For LM337 that will be more tricky with stability. Just by itself there shouldn't be much difference compared to the standard datasheet application, performance wise.
This has been very much discussed on this thread, how to make a stable reg version, because of two things:
1) The original proposal of this project was to add a few discrete parts, active and passive, to an existing 3X7 regulator basically to improve the original regulator's noise.
2) Most (once again) existing transformers on those regulators to be improved use only three wires: V-0-V. Not 4 wires with two 0-V voltages each. From the latter you could make two positive 317 regulators, and then series connect them into V+_ G _V-. That is not possible with three-wires transformers.
1) The original proposal of this project was to add a few discrete parts, active and passive, to an existing 3X7 regulator basically to improve the original regulator's noise.
2) Most (once again) existing transformers on those regulators to be improved use only three wires: V-0-V. Not 4 wires with two 0-V voltages each. From the latter you could make two positive 317 regulators, and then series connect them into V+_ G _V-. That is not possible with three-wires transformers.