Re: I miss Pinball Liz..

Ed:

Yes, I also had a buffered approach, although it did not use
discrete FETs.

-Mark
--
http://pinballpal.com/

"GPE" <See_GPE_website@xxxxxxx> wrote in message news:5JI8i.328739$ZA5.214268@xxxxxxxxxxxxxxx
"Mark Clayton" <spamuser1604@xxxxxxx> wrote in message news:46635365$0$8948$4c368faf@xxxxxxxxxxxxxxxxx
How did the Liz boards get around the opto problem?
Did they simply overdrive the LED side?

I had another solution in the proto board that I made a couple
of years back when PBLIZ temporarily shut its doors.
I suspended the project when they re-emerged, but maybe
it's time to give it another look.

-Mark
--
http://pinballpal.com/

Good question. I'd like to know the answer to this as well. PBLIZ had made a big deal about the shortcomings of the Williams
Opto problem and I ASSUMED they fixed it right. I also assume they used the opto driving a second transistor approach - but could
be wrong.

The best way around this Williams opto-in-a-switch-matrix problem is to use a standard low cost opto such as the QVE11233. Use
the output from this opto to drive a second transistor... typically a FET. The output FET would then have the proper voltage
swing and required current drive for the switch matrix. This is the exact approach that Stern uses in some of their opto designs.

-- Ed


"GPE" <See_GPE_website@xxxxxxx> wrote in message news:WhI8i.391668$7g3.120523@xxxxxxxxxxxxxxx
I thought you were making TZ clock boards.
Are those still in the works? I'd love to see a proper design out there that addresses the Willliams design fupah which then
required the use of the .0086 variant of the opto. Quite simple to get around this ... and I think the original PBLIZ clock
boards did if I remember correctly.

Bally solenoid board? I had one started as well - it looks like the 3081 transistor arrays used on the old ones are drying up
fast. I shelved my design because I never have time for this stuff anymore.
Would be pretty easy to swap in MOSFET transistors to replace the 3081's/TIP102's. Remember simple MOSFET's don't like large
di/dt -- use small caps on the gates to slew the switching speed (Stern remembered to do this - see their design for example).
Put in a simple switcher as well - less heat on this board as well as that rectifier board. But - watch out what you use for
the high voltage. Don't do what somebody else did - use LM317AHV's and exceed their voltage rating. Honestly, I don't see
anything wrong with a simple series pass transistor type regulator as used now. This type of supply can always have parts
available as long as you don't use some obscure part (like Bally did). Just beef it up and use modern parts here.

-- Ed


"kenny_ii" <kenny_iik@xxxxxxxxx> wrote in message news:1180912403.444671.228980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
A web designer I'm not. I finished up this board set and went right
into developing the Bally solenoid board. Since I have a day job, I
haven't made putting the board on a web site a priority. I did a bit
of re-engineering on componenet values and added the ability to adjust
the sensitivity in the game. I have listed them on Ebay a few times
in the past, there's more information there as well. Here's a link to
the last auction with some pictures.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=13727&item=300108935232

K2


On Jun 3, 4:55 pm, "Pinball Magic" <i...@xxxxxxxxxxxxxxxx> wrote:
I was thinking the same thing..

"GPE" <See_GPE_webs...@xxxxxxx> wrote in message

news:7zF8i.153391$Fk2.76003@xxxxxxxxxxxxxxx



Ah -- so -you're- Pinpoint!
I never saw that particular TZ board. Where can one find info on this
board?

-- Ed

"kenny_ii" <kenny_...@xxxxxxxxx> wrote in message
news:1180875974.059014.164640@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
With all due respect to Joel, have you seen the TZ trough board or AFM
saucer board I make through Pinpoint? I agree Joel had good stuff,
but to summarily dismiss other stuff sight unseen seems a bit unfair.

K2

On Jun 1, 3:55 pm, Vic Ireland <vicNOSPAMirel...@xxxxxxxxxxxxxx>
wrote:
Some of the things he offered may be available from other sources now,
but none of them match the quality of engineering that PBliz put into
his stuff. His products were ROCK SOLID. I would happily pay a
premium for a PBliz board over any other if he started up again just
because I know it's engineered to last. His TZ boards, especially,
were fantastic.

On Fri, 01 Jun 2007 11:37:35 -0700, ldnayman <ldnay...@xxxxxxx> wrote:
On Jun 1, 1:51?pm, turbo <h...@xxxxxxxxxxx> wrote:

I also miss Joel. He was a great source for top quality electronics
at
fair prices. I used a bunch of his products without any problems
ever,
and he was always helpful, and nice. Certain people had to bitch
because they thought his products were overpriced, and he got sick of
all the BS, and he moved on to other things. We lost a very valuable
source for parts when he did. Mike.

What did he offer that you can't currently find by someone else?
Without getting yelled at if you let it slip that you had once looked
at Clay's guide?










.

Relevant Pages

  • Re: I miss Pinball Liz..
    ... of years back when PBLIZ temporarily shut its doors. ... a big deal about the shortcomings of the Williams Opto problem and I ASSUMED ... transistor approach - but could be wrong. ... I'd love to see a proper design out there ...
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  • Re: I miss Pinball Liz..
    ... of years back when PBLIZ temporarily shut its doors. ... a big deal about the shortcomings of the Williams Opto problem and I ASSUMED ... transistor approach - but could be wrong. ... I'd love to see a proper design out there ...
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