as you can see there are two Capacitors (C2 & C4) in this Schematic, that better be non-polar version....
i put two 220uf 50v in series with negative pins connected to each other and got something around 110uf at last....
can somebody explain me the difference this 10uf can make?
and the other thing,, What is so special about "BlackGate STD" capacitors, i tried to search on google but no results...
thanx Already
An externally hosted image should be here but it was not working when we last tested it.
i put two 220uf 50v in series with negative pins connected to each other and got something around 110uf at last....
can somebody explain me the difference this 10uf can make?
and the other thing,, What is so special about "BlackGate STD" capacitors, i tried to search on google but no results...
thanx Already
Andrew T: so u say i use the ones i made with a little difference in capcitance ? or normal electryicals ? which makes better results ?
im yet wondering what makes those black caps (1000uf 50v) that big they are...
im yet wondering what makes those black caps (1000uf 50v) that big they are...
An externally hosted image should be here but it was not working when we last tested it.
Absolute values of C2 and C4 are not too critical, they're only needed to reduce gain to unity at DC and cutoff is plenty low enough for that. Real bipolar ones would be preferred, though with 1k of series R it's not too much of a deal either.
1000µ buffer caps seem a little excessive, they're less than an order of magnitude smaller than typical power supply bulk capacitance. Anyway, it doesn't hurt either.
1000µ buffer caps seem a little excessive, they're less than an order of magnitude smaller than typical power supply bulk capacitance. Anyway, it doesn't hurt either.
A polar cap datasheet may also list its reverse voltage tolerances. For example, a 6.3v cap may have insufficient reverse tolerance. However, a 25v polar cap may have enough reverse tolerance for the job. Check the datasheets.
A larger NFB cap can "allow" louder lowest notes, so what is the percentage difference between 100 and 110 and how much many more notes lower might that be able to play? Two. It can pass about two notes lower pitch.
There are many interesting bass effects possible in the relationship between the input cap versus the NFB cap.
Why not un-series your 220uF and use the 220uF values for NFB cap for half the distortion? Hey, no problem going bigger as long as its clear (a good performing cap). Also potentially helpful to treble is to add a little 10nF inexpensive polyester in parallel to the NFB cap.
Most audiophile capacitors are also know as "Low Impedance" and "Low ESR" which are very useful types to put at predrive and "right next to the chip" as well as useful for signal caps. Many manufacturers make a selection of low impedance cap.
If building without a scope handy, C8, C9 are actually a good idea for Parallel Non-Inverting LM3886. The C8, C9 caps promote stability, and its better to promote stability in some way rather than do without.
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