m5 #1

[tomg]

Sorry I didn't leave much of a description earlier. I had to go to the
game. Greg Maddox hit a Homer! It was great... Anyway, what we have here is
as much of the works as I could squeeze into a 6r space. I might could
squeeze it down to 5r if those $90 cases from JDR are worth considering.

I figure Midi2cv8 maybe upgrade the dac like Tony A. suggested. If not the
midi in/thru area could have 1/4" cv jacks.

The cv goes through glide, lfo sq/tri modulator (vc-range), pitch bend,
internal routing to vcos ect... much the same arrangement as the Mad Mouse
except the P.B. and mod lfo have a cv distribution switch, 

This is a lot like having 10 hardwired patch cables. A distribution switch
usually requires wires going all over the place. My idea is to use analog
switches on the board and cv selection. This would replace the switches
with pots running only one wire to the board. The other two terminals would
go to +/- 15V.. 

What.!!!  +/-15V???...yes I will break with my +/-12V tradition and build 2
LM723 regulators with TO220 pass transistors mounted to on-board heatsinks
+/-15at1.5A and TO220 regs for +/-5at1A enough to run at least 2 of these. 

The vcos are the prodigy clones with 3080 sine converters and 3046
exp-converter, there will be a heater option, if you don't want to heat 'em
up just leave 4 resistors off the board and put in tempco's ( I got into
trouble with the Mad Mouse talking like that ) I should say the vco
front-end is for all pratical purposes the same as Gene's asm-1 and I hear
tempco's work for it. I have never tried. However it's still a 3046
exp-converter and it for absolute sure is very stable all by itself
no-heater engaged.

The vcos are patched internally for sync vco1->vco2, fm vco2->vco1 and a
two division sub-octave connected to vco2.

The vcfs...there are two or four depending on how you look at it. VCF1 is a
ms20 style Sallen and Key filter with hi/lo pass options. VCF2 was a
memorymoog type transistor ladder until I got mail from Peter B.. Now it's
switchable moog/ems type diode ladder. As long as it's gona take a gross of
analog switches whats 2 or three more..;-) The sk filter is the dual 3080
version. It sounds better.

A simple audio mixer vco1/vco2/sub-oct/noise/external/ring-mod.

The vca is a dual LM13700 with vc-pan. Thanks to Jurgen for the terrific
crossfade design, I used it twice.. I should probably find a way to get him
a board set..:-)

New style 556 dual ADSRs no 4016. The outputs are connected to a range pots
and distribution switches.

LFO1 is the new lfo design with the slower core. lots and lots of waves.
range pot and distribution switch.

LFO2 is the ms20 morphing lfo with x-fade between outputs.
range pot and distribution switch.

There is a 1496 ring modulator, a preamp and a envelope follower w/external
in.

There are lots of patch options available with the distribution switches,
but if thats not enough you can put a 2r panel under this and mount all the
1/4" jacks you wish.  Another option woulb be to place switching stereo
jacks on the distribution switches, with 6 jacks you could patch into
anything in the system.

What do ya think? Too much? Not enough?

-tg