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In Reply to: RE: 5R4GY and filter cap values posted by DewDude on March 21, 2017 at 07:49:04
The 5R4GY has a relatively low steady-state peak current rating of 650mA. That's the reason for the low value specification on the PSU filter's first cap. At relatively low B+ and current draw conditions, the first cap could be considerably higher such as the 47uF value that you have seen. You will not know for certain unless you have the specifics of the power supply circuit and component values. If these are available (or if you could take some measurements) a simple PSUDII simulation will let you know what you can use in the first capacitor position.
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