Archived from groups: rec.games.pinball (
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Oh, I'm not going to yell at you.
In fact, you seem to completely support my point of view - that the 18000uF
caps are too dang big.
But, that 16 volt rating is cutting it pretty close, though. And 70 cents
for a cap... hey, that's pretty cheap!
Problem is - the people that buy parts tend to scoff at me when I tell them
to go -smaller- in capacitance. I've given up on explaining things and just
decided to carry some of the overkill capacitors. Still... just might stick
with 10000 or 12000uF axial's at 25V and at a reasonable price. Hopefully,
far less than the $7+ each that CDE wanted for the 18000uF 25V axials.
And, while speaking of oversized capacitors...
The 160uF cap on the high voltage section of the older Bally and Stern
machines. Did the math on these and it looks like anything 80uF and higher
should work just fine. For the heck ofit - I bought a 47uF, 350V cap - and
it worked just fine as well... but I wouldn't recommend a replacement cap
this small for this supply. But, 100uF caps (which are far easier to find
in 350V rating) should be just fine here.
-- Ed
<cfh@provide.net> wrote in message
news:1123330126.944509.300370@o13g2000cwo.googlegroups.com...
>I know you will yell at me ed, but i use 10,000 mfd 16 volt caps
> all the time for these filter caps and it works just dandy. i get
> them for like 70 cents each too, snap caps.
>
> If you look at the 12/5 volt circuit, it's basically the same
> as the WPC-95 circuit. And williams went to 10,000 mfd caps
> for WPC-95. Why? i'm sure cost was somewhat of a factor, but
> i think the main reason was In-Rush current. The in-rush with a
> 15,000 mfd cap is enormous. This puts lots of strain on the
> power supply apparantly. 10,000 mfd still filters nicely but
> with less in-rush. I use 10,000 mfd on nearly all brands of
> games (they really all use the same linear 5/12 volt circuit)
> including bally, gottlieb, williams, stern.
>
> anyway i didn't do the math of the circuit, this is just my
> experience. before i replace the cap, i set my DMM to 2 volts AC
> and measure the AC. i often see .200 vac or even .500 vac.
> Then i put a new 10,000 mfd 16 volt cap in and the VAC is
> like .005 vac! to me that shows it's working pretty good.
> (exception: sys3-sys6 power supplies will never show below
> .200 vac no matter what cap is installed, because it is only
> half wave rectified on the power supply.)
>
> GPE wrote:
>> Based on the 12 volt input (ok, typically measures a hair under 12 for
>> me)
>> and current draw -- the 18000uF caps that Williams installed were
>> overkill.
>> A 12000uF or 15000uF capacitor should work just fine here. Don't go
>> under
>> that 20 volt rating, though.
>>
>> The 18000uF, 20V capacitors are no longer made. But, to replace them -
>> you
>> can now buy 18000uF, 25V axial capacitors. CDE makes these -- part
>> number
>> 066X183U025JP2. I just got a quote for 400 of these two weeks ago - and
>> they weren't cheap! When I went to buy them last week... the barstards
>> hiked the price by 25% and would not stand by their quote. Told them to
>> take a flying leap....
>>
>> Now looking to buy 15000uF, 25V axials from Illinois Capacitor. Plenty
>> good
>> enough for a Williams System 3-11 machine.
>>
>> You can probably go to the 21000uF cap. But, that's as high as I would
>> go.
>> Going with a higher capacitance value puts more stress on your bridge
>> rectifier. The result of higher capacitance is a huge current spike
>> during
>> a very brief recharge period. The larger the capacitor, the shorter the
>> spike interval... but also the larger the capacitor, the larger the spike
>> in
>> amplitude. It is possible to degrade ... or kill... your bridge
>> rectifier
>> due to too large of a filter capacitor AND a hefty load on the 5V supply.
>>
>> -- Ed
>>
>> <scott@farrar.com> wrote in message
>> news:1123256673.247156.146670@g49g2000cwa.googlegroups.com...
>> > My BK game is resetting when I press either Flipper Button. I removed
>> > the Power Supply and replaced it with a known working Power Supply and
>> > now the game plays fine.
>> >
>> > I want to replace this +5/12 Volt Filter Cap.
>> >
>> > The spec calls for a 18000 mFd 20VDC capacitor.
>> >
>> > The local electronics store here only has a 21000 mFd 20VDC cap.
>> >
>> > Can I use this higher value (21000) in a Sys7 Power Supply?
>> >
>> > NOTE: Clay gives a range btwn 12000 & 18000 for the Sys6 Power Supply
>> > Cap (it uses a 12000) but no range is given for the Sys7 Power Supply
>> > Cap.
>> >
>> > Thanks
>> >
>
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