where can i find this capacitor?

[jocoman]

Sorry for this newbie post
I am building the attached power supply and i am stuck for sourcing the 100uf caps.
I notice that they are not electrolytic so what are they? How many volts?
Could some one please find me a digikey or mouser reference.
Thanks

[DSP_Geek]

Electrolytics will be fine in that application. Anything else in a power supply is way, way over the top.

[Atilla]

This is a high-voltage power supply! Look at the schematic, it says ~ 216V.

Do NOT replace those with normal electrolytic, they'll literally evaporate.

You need capacitors with voltage rating of 220V * 1.41 at least, I'd say you should be looking for 400V rated capacitors.

Nichicon, RIFA have caps like that at reasonable values. I'm sure other brands have them as well.

[Lazybutt]

Joco,

They are not drawn as electrolytic, but if you want to avoid having a HUGE PS unit, you'd better choose electrolytic ones... with that rating, film caps are rare (but do exist I believe), they would be overkill and too big / too expensive for most applications.
Electrolytics are just enough for such power supplies

One good practice is to bypass them with a small film cap though (i.e. in parallel) : 100nF to 1uF to lower impedance at high frequencies

The steady state voltage is 221V as on the drawing. But if your transformer is 190V AC as on the drawing, once rectified, you'll get 190* sqrt(2) = 269 V peak voltage (at startup)
TO account for AC line variations, etc.... I'd take 350V to be safe, but higher is even better.

Depending on where you live, these should be pretty widely available (Digikey, Mouser, eBay, Farnell, RS, etc..... ) one of the fun part with DIY is finding the best source for components, so search the net..

I also personnaly like this shop: AudioCap: The Audio Capacitor Online Shop

[David Davenport]

Joco,

You might consider the CDE 944U101K801AAM, Digi-Key part number 338-1918-ND

Dave

[agdr]

Some more choices...

The ratings from Hammond on the transformer secondary are 380V CT at 71mA

Hammond Mfg. - "Classic" Power Transformer - (263-282 Series)

With a full wave capacitor-input circuit you have 1:1 for the secondary current pass-through at full load, fouth picture down on the left

http://www.hammondmfg.com/pdf/5c007.pdf

and Vpeak(dc) = 0.71 Vsec(ac) = 270Vdc, so use 300V or 350V rated caps. Figuring in a 15% line voltage bump brings it up to 310V, so 350V may be the best choice, like Lazybutt said.


710mA ripple rating, more than you need, $2.44, 10,000 hour life at 105C, 25mm tall:
Digi-Key - 565-1457-ND (Manufacturer - EKXG351ELL101MM25S) [Digikey]

1.2A ripple rating, 10,000 hour life at 105C, 31 mm tall:
Digi-Key - P13550-ND (Manufacturer - EEU-ED2V101) [$3.17 Digikey]
EEU-ED2V101 Panasonic Electronic Components Aluminum Electrolytic Capacitors - Leaded [$3.17 Mouser]

1.5A ripple rating, 10,000 hour life at 105C, 25mm tall:
UCS2V101MHD Nichicon Aluminum Electrolytic Capacitors - Leaded [$2.35 at Mouser]