Re: Wico XY Pattern Generator - Schematic capture complete

Schematic seems correct.
On Nov 13, 2011 9:19 PM, "Zitt Zitterkopf" <zittware@hotmail.com> wrote:

> I decided to forgo the HC4040 conversion for now. Too much risk given
> my desire to get a working prototype on the first pass.
>
> Here’s the final prototype schematics.
>
> http://Pinball-Mods.com/blogs/wp-content/uploads/2011/11/XYPattern.pdf
>
>
>
> And the final Board files:
>
> http://Pinball-Mods.com/blogs/wp-content/uploads/2011/11/brdPatternXY.pdf
>
>
>
> The active components (switches, linear pot, adjustment pots, jumpers, and
> video connector) are all populated on the reverse side. This will allow me
> to put the board on standoffs and a acrylic top on the device to protect it
> from dust/flying multimeter/scope probes.
>
>
>
> While the board is likely smaller than the two in the original; the board
> is still 5.1x3.9” tall which yields a board costing over $50 at batchPCB.
> By far the largest parts on the board is the 2716s... oneday maybe I’ll
> figure out how to move the EPROMS into a single EEPROM device and surface
> mount it.
>
>
>
> I’m still moving forward with the project; will likely be ordering the
> prototype board tomorrow afternoon.
>
> John
>
>
> *From:* Rodger Boots <rlboots2@gmail.com>
> *Sent:* Saturday, November 12, 2011 9:16 PM
> *To:* vectorlist@vectorlist.org
> *Subject:* Re: VECTOR: Wico XY Pattern Generator - Schematic capture
> complete
>
> On Nov 12, 2011 8:55 PM, "Zitt Zitterkopf" <zittware@hotmail.com> wrote:
> >
> > Rodger,
> >
> > I like the idea of the 4040 conversion because it replaces 3 chips for
> the cost of 1. Meets the goal of the redesign. It should also greatly
> simplify routing of the pcb.
> >
> > Was there a typo w/ regards to the 4040 conversion?
> > 11 goes to U3 pins 3 & 11
> > should read
> > 11 goes to U2 pins 3 & 11
>
> Yes should be U2 instead of U3.
>
> > also; !Q from U6B seems to be missing.
> > My assumption is to move U1D to be A8 in and !A8 out which feeds U6A CLK
> (pin 3).
>
> No reason to not leave U1d and U6b as is. Just don't connect HC4040 pin 1
> at all (U6 pin 9 will provide A8).
>
> > John
> >
> > From: Rodger Boots
> > Sent: Friday, November 11, 2011 10:02 PM
> > To: vectorlist@vectorlist.org
> > Subject: Re: VECTOR: Wico XY Pattern Generator - Schematic capture
> complete
> > Errors that I can see (and why they are errors).
> >
> > On U2, GET RID OF R40 and connect pin 3 to pin 11 (pin 2 stays connected
> to pin 12). This sets U2 to divide by 9 instead of 10. As it is now U2
> does basically nothing. With the outputs at 0000, a clock will bring pin
> 12 high which then causes a reset that takes the outputs back to 0000.
> Pins 8, 9, or 11 will never be anything other than 0.
> >
> > Oddly enough, U2 can be either a 74HC90 OR a 74HC93---circuit will work
> the same either way.
> >
> > U3, U4, & U5 outputs are mostly going to the wrong places. The original
> ionpool.net schematic had the pin numbers right, but the pin names
> wrong. You should have switched the pin names instead of the pin numbers.
> >
> > U3 pin 12 is fine (goes to U3 pin 1)
> > 9 is fine (goes nowhere)
> > 8 should go to U4 pin 14 and U9 pin 2
> > 11 shouldn't go to anything
> > U4 pin 12 is fine (A0)
> > 9 should be A1 (does NOT go to U5 pin 14)
> > 8 should be A2
> > 11 should be A3 and connects to U5 pin 14
> > U5 pin 12 is fine (A4)
> > 9 should be A5 (does NOT go to U1 pin 9)
> > 8 should be A6
> > 11 should be A7 and connects to U1 pin 9
> >
> > That's the end of what I've found so far. Don't read the rest of this
> unless you want to start modifying things.
> >
> > - - - - - - - - - - - - -
> >
> > If you wanted an easy way to lose a couple of chips, U3, U4, & U5 could
> be replaced with a 74HC4040 with the pins used like this:
> >
> > 74HC4040 pin 1 goes to A8 and connects to U1 pin 3
> > 2 goes to A2
> > 3 goes to A1
> > 4 goes to A3
> > 5 goes to A0
> > 6 goes to U9 pin 2
> > 7 goes nowhere
> > 8 goes to ground
> > 9 goes nowhere
> > 10 goes to ground
> > 11 goes to U3 pins 3 & 11
> > 12 goes to A5
> > 13 goes to A4
> > 14 goes to A6
> > 15 goes to A7
> > 16 goes to +5
> >
> > U1D and U6B get totally removed from the circuit.
>

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Received on Sun Nov 13 22:50:28 2011