[sdiy] Lego synth anyone?

[anthony]

> In his BBD based delay module, Thomas Henry parallels some inverters for
> increased drive. What are you trying to achive.

I dunno exactly but I have a bunch of 564 PLL's. I think I'll make a stacked 
VCO.
I have 5 so I'll make one with just one and another with four and compare.

I wish my frikkin 'scope worked. I think all of the pots are toast - they're 
noisy beyond even slightly useful.I can't bring myself to scrap what used to 
be a really nice 2 trace scope. Even if it does have a 10-turn pot with 
counter knob. I already have two of those... Still... I've considered just 
taking everything off the front and just adding whatever I need to see audio 
waveforms. Or I could just use Scopion with tinyHost.
But I digress.

> In the high end DBX/THAT VCA's they had as many as 8 VCA's in parallel. 
> They do this because the signal level goes up much faster than the noise, 
> so with every additional VCA the noise gets lower. I don't remember the 
> formula, their single VCA's are quiet enough for me.
>
> Mark

Hmm that gives me an idea for the 3 LM1894 DNR noise reduction chips I have.
It works by reducing bandwidth of audio instead of dynamic range like 
compandors.
But there's a couple gain cells in there. And a peak detector. They might be 
more interesting in series as a SVVCF...
Probably nothing fruitful but interesting experiment even though if I come 
up with something  really cool, few people would be able to duplicate it 
since I'm pretty sure the LM1894 was discontinued a long time ago (even 
though it's a cool system that works pretty well