[sdiy] 1-quadrant multiplier with 2164

Ben Stuyts ben at stuyts.nl
Sun Jan 23 14:32:03 CET 2022

Excellent! To me, it has a certain hand-taped layout quality to it. Perhaps because of those non-45 degree traces that everybody is religious about nowadays.


> On 22 Jan 2022, at 21:25, David G Dixon via Synth-diy <synth-diy at synth-diy.org> wrote:
> Here are three outputs of my Excel layout exercise.  This is the 18-stage Dome filter in the Freak Shift.  The PCB is nominally 2.1" wide (although I cut them 2" wide to get four out of an 8" blank and it is just fine) and 4.3" long (the maximum for eurorack).  Note that, since several boards stack up, the empty spots under the rectangles on the left and right edges (which represent pin headers) are for "pass-through" pins.  This particular PCB is in the middle of the stack.
> These images are the Layout (where I actually do the routing, by hand, of all the traces -- it is much faster to do than you'd think), the Transfer (which is what is printed on PnP Blue), and the Guide (which is what I look at when stuffing, although now I build these completely from memory).  This board is almost unique in my output, because it only requires one jumper wire (the dark blue line on the right hand edge).  Incidentally, this Dome filter works perfectly with both +12/-12V and +15/-15V supplies.
> <18StageDome Layout.png>
> <18StageDome Transfer.png>
> <18StageDome Guide.png>
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Guy McCusker via Synth-diy
> Sent: Saturday, January 22, 2022 2:56 AM
> To: cheater cheater
> Cc: synth-diy at synth-diy.org
> Subject: Re: [sdiy] 1-quadrant multiplier with 2164
> [CAUTION: Non-UBC Email]
> On Sat, Jan 22, 2022 at 10:48 AM cheater cheater via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>> I think what David is doing is he's using Excel to figure out part substitutions for the passives. He's not doing it for trace routing, that's probably by hand.
> Oh boy are you in for a surprise!
> David's method is quite amazing. 
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