Change from a 200ohm slider pot to a 200ohm rotary pot. Easy enough to find
one of those I expect.
http://www.tocos.com/local/pdf/products/RV24.pdf
RV24NB200K
200ohm rotary pot, and they will supply samples.
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Zitt Zitterkopf
Sent: Tuesday, November 08, 2011 8:31 AM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
Zonn,
Xcellent Feedback! Many thanks!
Yes. Q1E is tied to the Front Panel board which is part of the switch
matrix. I'm waiting on corrected wiring diagrams from Dave.
My gut tells me the Emitter is tied to the 200ohm pot which in turn drives
RGB out.
The problem with this RGB out circuit as is... is that the 200ohm slider pot
doesn't appear to exist anymore. The best I could find from Digikey is
either a 250 expensive rotary pot. Or a 5K slider pot. I'm wondering if I
could use one of the spare opamps to emulate the 200ohm pot from a 5k slider
pot. But the KISS methodology tells me it's smater to just to the 250 rotary
pot. Thoughts?
The opamps are TL084B . Thanks for the tip regarding opamp strapping... will
make these changes tonight after work.
John
_____
Date: Tue, 8 Nov 2011 02:28:20 -0800
From: mlists@zonn.com
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches
It looks like Q1 is missing a resistor on its emitter to ground, and a wire
going somewhere (is this the Z-axis driver?). Without these the whole U12B
circuit doesn't do anything, and you can remove it.
Depending upon the op-amps you're using, you might want to put some 10~50ohm
resistors on the outputs of the the op-amps that drive the monitors. (U14
B&C and U16 B&C). They will keep the op-amp from oscillating when driving
long wires, and will give some protection if (or should I say when) the
outputs are shorted to ground, a voltage, or each other. Some op amps have
these resistors built in. Your schematic doesn't mention the op-amp's value
so I couldn't look them up.
Use 74HCxxx series. they're fast, low power, and will be more noise
resistant than the 74xx or 74LSxx devices.
The proper way to terminate unused op-amp sections (U14D & U16D) is to tie
the '-' input to the output (like U16D), and tie the '+' to ground. This
forces the output to ground (instead of +12V or -12V). This will usually
result in lower power consumption, and prevents disasters if the output
accidentally gets shorted by the probe of a voltmeter or oscilloscope.
-Zonn
On 11/7/2011 10:52 PM, Zitt Zitterkopf wrote:
All,
If you're interested in the re-capture of Dave's Wico Schematics; I've
temporarily posted them there:
http://Pinball-Mods.com/blogs/wp-content/uploads/2011/11/XYPattern.pdf
Still to-do:
1) Determine 7493 wiring vs Dave's schematics.
2) Front Panel board integration - pending Switch Decode.
3) Simulate Opamps for circuit understanding.
4) Power Supply: pending power measurements - if someone will volunteer to
get them.
5) PCB Layout.
6) BOM Generation.
Changes w/regards to Dave's schematics:
A) Decoupling caps for each IC.
B) 0ohm "202 solder shorts" for unconnected pins of TTL gates at U2, U3, U5,
and the "top" of R30 (R3). So they can be reversed if necessary.
C) Passives are likely to have different RefDez.
D) IC Power Supply pins are shown at decoupling grid.
E) "Bussed" Address pins.
F) Unused Gates are "strapped" to a known state.
G) 74xx TTL logic is becoming obsolete. Plan to use 74HC logic or 74LS logic
- haven't decided.
My plan is to have the board manufactured by batchpcb.com as a dual sided
board.
Surface Mount ( yes; I can hear the screams of horror ) as I want to
minimize PCB size - thereby cost.
I'd appreciate any "peer reviews" of the schematic page.
As far as open source for the schematics / pcb; I'm concerned w/regards to
the original owners of the design. IE can't really open source a product I
don't own, can I?
Besides, Dave hasn't really given his blessing to the project given the
source of the schematics are via his work.
John
From: Zitt Zitterkopf <mailto:zittware@hotmail.com>
Sent: Monday, November 07, 2011 9:48 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches
David,
Many thanks. I'll put a shorting block to the R3 topside so it can be
disconnected - I'm pretty sure it should be there; even tho TTL generally
defaults to "high" if unconnected.
I found the problem I discovered - It wasn't with the 7490; but all the
7493s. For some reason your pinouts via PADS appear wrong.
http://www.ti.com/lit/ds/symlink/sn7493a.pdf
Fortunately; the QA is right ... but QB/C/D are incorrect . On the 93; they
are not wired as in the 92... 90 and 93 do share the same pinouts tho.
So; are the pin NAMEs right; or are the pin numbers? looks like the same
"mistake" is present on U3/U4/U5.
I'll go ahead and wire up the opamps - thanks for the info.
John
From: David Fish <mailto:dfish_1@comcast.net>
Sent: Monday, November 07, 2011 8:43 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
John,
>>@A-7 on page 1; R3 topside is listed as a NC.
Weird but that's the way it is on my board. Maybe they forgot to add a +5V
jumper.
>> I think you had Q2 and Q3 pins swapped
The pinout for the 7490 is correct QA=12, QB=9, QC=8 and QD=11. The PADS
library part used Q0-Q3 instead of QA-QD.
>> The Power supplies weren't pictured for U14, 15, and 16.
Good catch. They're powered by +/-12V, but that's not shown on the
schematic.
I think the connector issue stems from the fact that they have the two
identical connectors numbered opposite of each other. The main board 8-pin
connector is 1 thru 8 L->R while the switch board is 1->8 R-L. I wonder if I
plugged my cable back in wrong? There's no labels and the keys are symmetric
(stupid). Will look into this more tomorrow.
Dave
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Zitt Zitterkopf
Sent: Monday, November 07, 2011 5:37 PM
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
Dave - You rock! Thanks to everyone else too.
I've schematic captured based upon your schematics; Dave - many thanks. The
only peices I haven't captured are the PSU, the 2nd page, and diode switch
matrix.
Some questions came up while "re-engineering" the schematics.
@A-7 on page 1; R3 topside is listed as a NC... I'm guessing this is
incorrect as why would anyone put a resistor without a second conection?
My Guess is that R3 ties to +5V like the other two (R4, R5).
IIRC; something was "off" when I wired U2 @ D-6. I think you had Q2 and Q3
pins swapped. I'll look for sure when I get home.
The Power supplies weren't pictured for U14, 15, and 16. These Opamps are
tied to the +12 and -12 rails?
I plan on simulating the opamps to try to gain insight as to what they are
doing.
Seems odd that the DAC08s are driven from a non-linear voltage rail. IE V+
is 5V and V- is -12V. I'd have thunk they rails would be symetrical. IE
+/-12V. Maybe the opamps linearize it?
Can anyone get me some rail power measurements?
I'm going to try and do away with the transformer and linear regulators in
favor of a more complex (yeah; I know K.I.S.S) PWM psu which puts our all
three rails.
If I knew what the average current was for each rail; a small PWM might be
nice and cheap.
I *so* wish this was an opensource hardware project ... I'd so like to
release my PCB and schematics (assuming it works) to the public.
<sigh>
John
_____
From: dfish_1@comcast.net
To: vectorlist@vectorlist.org
Subject: RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
Date: Mon, 7 Nov 2011 17:05:13 -0500
John,
I already have mine apart on my desk. I'm looking at it now. I'm taking lots
of pictures.
Dave
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of John Robertson
Sent: Monday, November 07, 2011 4:49 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches
David Fish wrote:
John,
Before you mirror the schematics let me take a look at them in depth. It was
a looooooong time ago when I drew them.
Unfortunately, I no longer have the schematic source file or access to PADS
schematic cap even if I did. I looked at them online and yes, something
looks screwy about the switch board to main board connector pinout. I'm
thinking there's a reversed connector involved here. I'll let everyone know
what I find.
Dave
I have a working WICO XY Pattern Generator if you need any pictures (either
of you) just let me know and I'll crack it open...
John :-#)#
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Mark Shostak
Sent: Monday, November 07, 2011 2:44 PM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: Wico XY Pattern Generator - Decoding Switches
You can mirror the schematics from ionpool
On Mon, Nov 7, 2011 at 12:43 PM, John Robertson <pinball@telus.net> wrote:
Zitt Zitterkopf wrote:
I'm looking at the schematics for the Wico XY Pattern Generator; and can
seem to figure out how the Front panel PCB connects to the Main Board.
At A-8 on the main schematics page; it shows P3-1-8 as connected to the D
Flip Flops and the A10 of the U7/U8 pattern generating roms.
However, P3 doesn't seem to connect correctly to the "cable" connected to
the front panel board at B-8 on the second page.
It appears that the diode matrix appears to drive set/clear to Dflip flop
U6-A which controls A9 on the ROMs.
But I'm unsure of the encoding given I can figure out how "P3" connects to
the Front panel board.
Anyone have an idea?
John
Do you have a copy of the schematics so I can put them up on TTL? The manual
(such as it is) is there along with images of the Eproms.
ftp://ftp.flippers.com/TTL/TestEquipment/WICO
Thanks,
John :-#)#
--
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
www.flippers.com <http://www.flippers.com/>
"Old pinballers never die, they just flip out"
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Wed Nov 9 00:56:28 2011
This archive was generated by hypermail 2.1.8 : Wed Nov 09 2011 - 01:50:03 EST