Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: ashbrook.m on February 23, 2015, 11:42:23 AM
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Anyone know of a high quality but compact film cap I could use to replace the last 220 uF in the power circuit?
I'm looking to implement a choke on the crack as typically discussed here as well as replace the final power side capacitor with a film. My issue is real estate. I already have the speedball boards, film output caps with their own bypass, and space taken up by the PCB's used on my upgraded tube sockets in the same region of the box. There's not much space left once I add the choke even after I built a taller box to house the output caps. I suppose I could run long leads to the new capacitor and put it on the other side of the plate but I'd rather not. I am looking for a more compact solution. Any thoughts?
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http://www.mouser.in/ProductDetail/AVX/FFVE4H0227K-/?qs=sGAEpiMZZMv1cc3ydrPrF%2fs%2fQzsFsOC%252bznvdNLCWUxY%3d
This is about as compact as there is - only 85mm diameter!
There are "DC Link" types that are rectangular, but the closes I found was this, 65x58x70mm:
http://www.mouser.in/ProductDetail/Vishay-Roederstein/MKP1848720454Y5/?qs=sGAEpiMZZMv1cc3ydrPrF3AG%252b4bszs705a15%252bCo742M%3d
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Anyone know of a high quality but compact film cap I could use to replace the last 220 uF in the power circuit?
I'm looking to implement a choke on the crack as typically discussed here as well as replace the final power side capacitor with a film. My issue is real estate. I already have the speedball boards, film output caps with their own bypass, and space taken up by the PCB's used on my upgraded tube sockets in the same region of the box. There's not much space left once I add the choke even after I built a taller box to house the output caps. I suppose I could run long leads to the new capacitor and put it on the other side of the plate but I'd rather not. I am looking for a more compact solution. Any thoughts?
If you go down the choke route its been commented on a few times that the last film capacitor can be smaller than the 220uf electrolytic used which will help with space and height limitations within the enclosure. 89uf worked fine for me in conjunction with the choke and ripple was significantly reduced when modelled with Duncan aps PSU Designer II.
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JamieMcC, could you write a bit about the values you entered in PSUD II for simulating the Crack power supply? I'm interested in playing around with it, but I'm a bit lost...
I'd like to check what would happen if I add a choke and capacitor stage, not just replace the last resistor and capacitor.
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I have sent you a pm about this :)