I'm in the process of building the PA03, the 4780 chipamp designed by Pavel Dudek.
While completing the BOM I discovered that my supplier delivered the needed 47pF/500V ceramic capacitor only in quantities of 200. And that is liitle too much. So I searched for a replacement cap. In my opinion the best available replacement would be a 47pF/50V cap but I'm not sure if this is smart choice regarding the much lower voltage. It is about caps C9 and C16 in the attached schematic. Thanks
While completing the BOM I discovered that my supplier delivered the needed 47pF/500V ceramic capacitor only in quantities of 200. And that is liitle too much. So I searched for a replacement cap. In my opinion the best available replacement would be a 47pF/50V cap but I'm not sure if this is smart choice regarding the much lower voltage. It is about caps C9 and C16 in the attached schematic. Thanks
Does Pavel recommend a ceramic?
Which type?
I would expect a polypropylene to be suitable there.
You could also use a polystyrene or a silvered mica.
100V is certainly playing safe, since the supply rails must be <42Vdc.
I suspect that 50V rating would be OK, provided the amplifier never oscillates.
How did you source C3 & C7?
Which type?
I would expect a polypropylene to be suitable there.
You could also use a polystyrene or a silvered mica.
100V is certainly playing safe, since the supply rails must be <42Vdc.
I suspect that 50V rating would be OK, provided the amplifier never oscillates.
How did you source C3 & C7?
The Mouser BOM for the PA03 mentions a 47pF/500V(100V) ceramic capacitor NP0.
AndrewT, as far as I know this is what Pavel recommends. No problem to buy C3 and C7 in a small quantity. But for C9 and C16 I would have to buy 200 pieces.
Then I hope that this one will do: Vishay/Cera-Mite 47pF/1kV C0G (NP0) ????
It is somewhat bigger in size but I think there is enough room on the pcb.
AndrewT, as far as I know this is what Pavel recommends. No problem to buy C3 and C7 in a small quantity. But for C9 and C16 I would have to buy 200 pieces.
Then I hope that this one will do: Vishay/Cera-Mite 47pF/1kV C0G (NP0) ????
It is somewhat bigger in size but I think there is enough room on the pcb.
i got some from here Link = 10pcs 652 47pF 500V 2 Precision Silver Film Ceramic Capacitor 5911 | eBay
sorry if that link does not work try this one 10pcs 652 47pF 500V 2 Precision Silver Film Ceramic Capacitor 5911 | eBay
like this...... Capacitor Sounds, Speaker Cables and Crossover Inductors. interesting read also typed from keyboard but arthritically oww. lol
A 28000 word paper on "Cap Sound".
one for the dark winter evenings!
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