Tony359 Posted June 23, 2020 Share Posted June 23, 2020 (edited) Hello all, I am recapping the Apple //e green phosphor monitor and I stumbled into a 16uF/25V bipolar electrolytic capacitor which doesn't seem to be available - not even from large suppliers such as RS. I believe this cap is the last connected to the H-Deflection line. Ideally I'd like to replace it as I found a few caps completely off, a couple leaking and all of them were on the edge of their capacitance. I can easily find 10 or 22 uF. I am not competent enough to pick a different value unfortunately - any ideas? Thanks! Edited June 23, 2020 by Tony359 Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 24, 2020 Share Posted June 24, 2020 A couple of options here: 1) Place two electrolytic capacitors back to back. That's what they actually do internally for bipolar caps anyway. 2) Get a film capacitor. They're a bit more pricey, but are not polarized, available in 16uF, and have even better voltage tolerance than the cap you're replacing. They're typically made for UPS applications. Quote Link to comment Share on other sites More sharing options...
Tony359 Posted June 24, 2020 Author Share Posted June 24, 2020 Thank you again. I'll look into that, I didn't think of those. I also found some 15uF/50V Nichicon "audio" non polarised caps on Ebay. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted June 27, 2020 Share Posted June 27, 2020 15uF may work. But you will probably have to adjust L401 (width) and L402 (linearity) after replacing it. If you can also find a bipolar 1uF, you could solder it in parallel. Quote Link to comment Share on other sites More sharing options...
Tony359 Posted June 27, 2020 Author Share Posted June 27, 2020 I went for the 15uF in the end - it was also a compatible size and of radial type. The monitor is up and running, working great. To be honest geometry looks ok but I did see all the adjustment pots on the board. Cheers for your help! Quote Link to comment Share on other sites More sharing options...
GameGeezer Posted June 28, 2020 Share Posted June 28, 2020 (edited) 15 hours ago, Tony359 said: I went for the 15uF in the end - it was also a compatible size and of radial type. The monitor is up and running, working great. To be honest geometry looks ok but I did see all the adjustment pots on the board. Cheers for your help! Very nice. That looks crisp and fresh. Try Atarisoft Galaxian. FWIW, I would have gone for a higher rating on the cap. 1uF in the spec, you can likely get away with a 22uF cap. Under-rated, hard to say, but 1uF difference with a 15% var rating is potentially giving you close to 16uF anyway. Edited June 28, 2020 by GameGeezer Quote Link to comment Share on other sites More sharing options...
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