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On 07/03/2020 10:19, Geoffrey Thomas wrote:
[Have a read of the bottom of pages 24-26 of this excellent TI article :
The bottom of page 25 gives a reason for using 2 caps in parallel.]
Unfortunately that link no longer works,(I originally posted it on another group in 2013) but here is an excerpt posted in a reply:
"“ESL can be a problem by causing ringing in the low megahertz region but can be controlled by choosing low ESL capacitors, limiting lead length (PCB and capacitor), and replacing one large device with several smaller ones connected in parallel.”
I'm looking to see if I downloaded a copy.
On 06/03/2020 21:54, david via Groups.Io wrote:
I have no idea what the specs are on these old caps, The serial no. on this unit is 000287, date on PCB is 1965. The schematic shows 125V RMS @ 0.125A across secondary winding of transformer, and 175V measured across 2x40uF Cap. I don't have the knowledge to calculate the ripple current. I don't know what it could be. I think any 82uf x 250V cap is o.k. What is the reason they used a 2x40uF cap?