<div dir="ltr">It's not like the 2164 is hard to find these days, I would put the extra chip on the other board.<br><br>Could just be due to superstition about splitting something like a waveshaper across two boards :)<div><br></div><div>Pete</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 25, 2018 at 12:55 AM, David G Dixon <span dir="ltr"><<a href="mailto:dixon@mail.ubc.ca" target="_blank">dixon@mail.ubc.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi List!<br>
<br>
I'm in the process of laying out one of my circuits (actually the Rubicon 2<br>
TZFM VCO) for through-hole PCBs and 5U construction. I am nearly done with<br>
the layout, but I've come up against a conundrum, and I wanted to get some<br>
outside opinions.<br>
<br>
The circuit layout will have to be on two separate PCBs, which I've managed<br>
to limit to 4" x 6" each. I've got the main tricore VCO circuit and TZFM<br>
circuitry all done on one PCB, which is completely crammed. All of the<br>
waveshapers, suboctaves, Warp, and Squish will go on the second board, which<br>
is not quite as crammed.<br>
<br>
So, here's my issue:<br>
<br>
The entire circuit requires 12 VCAs (three 2164 chips). The main VCO<br>
circuit requires 10 VCAs and the Warp circuit requires 2 VCAs. However, the<br>
Warp circuit is on a different PCB. I have actually put all three 2164<br>
chips on the main VCO board. However, there is plenty of room on the shaper<br>
board for another 2164 chip.<br>
<br>
So, here's what I want your opinion about (sort of a "What would you do?"<br>
kind of thing):<br>
<br>
Should I:<br>
<br>
1) Lay out the 2 Warp VCAs on the main VCO board and connect them to the<br>
shaper board with wires, thus splitting the Warp circuitry between two<br>
boards?<br>
<br>
Or, should I:<br>
<br>
2) Use a fourth 2164 chip on the shaper board, only 2 VCAs of which will be<br>
used, thus keeping all the relevant circuitry on the same board (and wasting<br>
the equivalent of one entire 2164)?<br>
<br>
My inclination is to lay out for both possibilities and let the end builder<br>
decide how to handle it, but that seems kinda stupid. I'm curious what<br>
y'all think. The cost of doing the second option is about $5 (chip plus<br>
socket), so it's not exactly a life-or-death decision.<br>
<br>
Cheers,<br>
Dave Dixon<br>
<br>
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</blockquote></div><br></div>