[sdiy] 3 dollar lopass gate

[Elain Klopke]

There's a constant battle in my head about whether I should make a 25 or 49
key or two manuals of 25 keys version...

but back on topic: I like the idea from the Muffwiggler thread that Kylee
posted about putting a capacitor to ground on the LED input to lengthen the
attack and decay time.

On Sun, Mar 12, 2017 at 5:01 AM, Tom Wiltshire <tom at electricdruid.net>
wrote:

> That's going to be pretty cool, though! A whole keyboard of optical VCAs!
>
> Just be sure to let the blisters from doing the first batch heal before
> you do the next batch! ;)
>
> Tom
>
>
> On 12 Mar 2017, at 07:48, Elain Klopke <functionofform at gmail.com> wrote:
>
> So it just hit me that this would be an interesting and cheapish way to do
> the keying of all the notes on my paraphonic synth project instead of a
> bunch of 4066s.
>
> of course, after I placed the order, my brain did one of those old Master
> Card commercials...
>
> bag of LDRs on eBay: $12
> bag of LEDs on MPJA: $8
> 16 feet of heatshrink tubing: $4
> realising you just signed up to burn your fingers 400 times: Priceless.
>
> On Sat, Mar 11, 2017 at 3:03 PM, Kylee Kennedy <kmkennedy at gmail.com>
> wrote:
>
>> Keep up the great vids Quincas. This is a fun circuit for beginners.
>>
>> https://www.muffwiggler.com/forum/viewtopic.php?t=107006&sta
>> rt=all&postdays=0&postorder=asc&sid=a0b9661f2f8d7b7e71839d1600ecbdc4
>>
>> This thread goes into more details for those interested. I've built
>> dozens of these when Electronic Goldmine were selling off spec vactrol at
>> 50 for $10.
>> You won't get those pings and bongo sounds characterized by the Buchla
>> Lopass Gate. That schematic is out there if you want to compare the two.
>>
>> Cheers,
>> Kylee Kennedy
>>
>>
>>
>> On Sat, Mar 11, 2017 at 7:48 AM, Quincas Moreira <quincas at gmail.com>
>> wrote:
>>
>>> Hey Thanks!  The synth used for testing is the Make Noise 0 Coast, it's
>>> a beauty :)
>>>
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