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In Reply to: RE: DC blocking cap on output of dac ?? posted by Tweaker456 on April 12, 2016 at 11:44:19
if the voltage is low, you don't HAVE to use a low voltage capacitor. A much higher voltage film capacitor will not care that the voltage is low.
In calculating the required value for good bass response, keep in mind that the input impedance of the driven device is in parallel with the output of the DAC. The two impedances in parallel will give you a net impedance that is always a bit less than that of the driven device alone.
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I know I don't have to use a low voltage cap. It's size that's the problem. I'd like to be able to use a Silmic II on the output, a polarized cap or a very good film cap that will fit. Tweaker
it is difficult to advise you. But on the other hand, presumably you DO know the value, and the physical dimensions of any capacitor are generally available at the website of either the manufacturer or the vendor (e.g., Mouser, Digikey, etc). Surely, a Silmic II, in any conceivable value for a coupling capacitor function, will fit anywhere. A bipolar electrolytic, e.g., Nichicon Muse, is about the same size, for a given voltage/capacitance as a Silmic. From there, you go to film capacitors, which will of course be much larger, for any given voltage/capacitance. IMO, there's no point at all in using an electrolytic of any type, if the value you seek is less than 1-2uF. Unless you just like the electrolytic vs the available film caps. There's no accounting for taste, and there is no "right" or "wrong".
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