Re: Wico XY Pattern Generator - Schematic capture complete

At first glance I see over six errors. Let me look closer.

On Fri, Nov 11, 2011 at 2:33 PM, Zitt Zitterkopf <zittware@hotmail.com>wrote:

> Schematic capture is complete.
> Please peer review the schematics and point out any issues.
> http://Pinball-Mods.com/blogs/wp-content/uploads/2011/11/XYPattern.pdf
>
> Went with linear regulators powered by 15VDC in from a power brick.
> -12VDC is generated from a buck converter. Optional +12VDC is driving from
> same buck converter. +12VDC buck is *experimental*; so included +12VDC
> linear regulator as a backup.
>
> 5VDC max amps is 850mA; although I calculate 338mA for circuitry. 400mA
> budgeted for –12VDC regulator loading 5V linear reg.
> +12VDC and –12VDC max is calculated at 38mA. Provided headroom for +12VDC
> to 100mA.
>
> Same pinouts as original; although slightly different connector. Added
> jumpers to “replace” wires to short control to outputs.
> RGB LED pushbuttons drive color outputs.
> SP8T switch for selecting pattern. 8pole cheaper on digikey than 6pole.
> Allows for future use if patterns expanded.
>
> PCB Layout likely begins Sunday night.
> John
>
> *From:* David Fish <dfish_1@comcast.net>
> *Sent:* Wednesday, November 09, 2011 5:16 AM
> *To:* vectorlist@vectorlist.org
> *Subject:* RE: VECTOR: Wico XY Pattern Generator - Decoding Switches
>
> >> HIS shows the crystal as 3.795 MHz, I wonder if he meant 3.579 (a very
> common TV colorburst crystal). ****
>
> ****
>
> OK, That helped me remember why this seemed a little rushed and
> incomplete. Notice several things on the schematic are hand written (XTAL
> frequency and my name). This is because I lost the source schematic in a
> disk crash and I stupidly hadn’t backed it up. The schematic I had was the
> last printout I had and I thought it was done. Oh well.****
>
> ****
>
> I looked at the 7490 pinouts after Rodger’s post and sure enough, they’re
> wrong. Looking on the web for data sheets showed that they are not all
> alike between manufacturers. This will require some more checking.****
>
> ****
>
> Dave****
>
> ****
>
> *From:* owner-vectorlist@vectorlist.org [mailto:
> owner-vectorlist@vectorlist.org] *On Behalf Of *Rodger Boots
> *Sent:* Wednesday, November 09, 2011 1:17 AM
> *To:* vectorlist@vectorlist.org
> *Subject:* Re: VECTOR: Wico XY Pattern Generator - Decoding Switches****
>
> ****
>
> I was taking a look at your schematic (which I'll call "YOURS") versus the
> one on ionpool.net (which I'll call "HIS") and have a few observations:
>
> HIS shows the crystal as 3.795 MHz, I wonder if he meant 3.579 (a very
> common TV colorburst crystal). Wouldn't make much of a difference, except
> for availability.
>
> YOURS has the R40 jumper connecting pins 2 & 3 of U2. That would keep U2
> from working. His shows pin 3 connected to pin 11 which makes U2 a divide
> by 9 counter.
>
> U3 then further divides the clock by 16. So if you changed the crystal to
> 24.858 KHz you could delete both U2 and U3. (3.579545 MHz divided by 9
> divided by 16). Not a prayer of finding a 24.858 KHz crystal (would
> actually be a ceramic resonator at that frequency) though. BUT could be a
> 555 timer tuned to that frequency (CMOS version would be better).
>
> HIS doesn't have the reset pins of the 7493s grounded, would keep them
> from counting.
>
> Both schematics have the pinouts/connections to the 74??93s messed up.
> Qa is pin 12
> Qb is pin 8
> Qc is pin 9
> Qd is pin 11
> It is pin 11, then, that provides the clock for the next stage.
>
> U4 and U5 could be combined into one 74??393.
>
> I'll go back to hiding in the corner now.
>
> ****
>
> On Tue, Nov 8, 2011 at 12:52 AM, Zitt Zitterkopf <zittware@hotmail.com>
> 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 <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 <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 <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 ****
>
> "Old pinballers never die, they just flip out"****
>
> ****
>
> ****
>
> ****
>

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Received on Fri Nov 11 16:10:56 2011