Yup this is terrific news! Well done scott :)
> WE STAND AT SALUTE!!!!
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> this is awesome. a drop-in complete m-board pcb, with BOM, would be so huge......wow.
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> --- On Wed, 3/18/09, The Old Crow <oldcrow@...> wrote:
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> From: The Old Crow <oldcrow@...>
> Subject: [yamahacs80] VCO153 project in board test phase
> To: yamahacs80@yahoogroups.com
> Date: Wednesday, March 18, 2009, 1:39 AM
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> Hey folks, its been a while, but I have this thing in testing right
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> now. This is an equivalent circuit to the IG00153. This differs from
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> my MOTM-style modular 153 oscillator in that it is strictly the VCO IC
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> with a ramp output, linear CV input, current bias input (FT) for octave
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> select and exponential modulation (vibrato) input. It can use the
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> original M-board FET and charge pump capacitor, or those can be removed
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> and local ones installed. I made this mainly to see about replacing
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> things at the chip level, but not relying on custom devices. It is 98%
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> SMT parts, with only 3 parts left through-hole for the moment (mainly to
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> swap things and see how the specs change). It no longer needs an input
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> offset trimmer, or external frequency compensation of the input summing
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> amp. The DIL-16 footprint in the middle of the board is used to install
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> it into an actual IG00153 socket. Generally it is low-profile enough to
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> fit between M boards (it does in my CS-50). It has internal temperature
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> compensation of the charge switch and comparator, making it much more
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> stable than the original device. The charge pump core circuit runs on
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> its own internal 10V reference supply.
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> Eventually I want to craft the entire M-board from standard circuits.
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> The waveshaper is done (it is the one I made for the 153 module). The
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> EGs are done. The filters are done. I know how to build the VCA, thats
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> next. In any case here is an image of the board, a bit larger than
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> actual size. More later...
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> http://www.cs80 com/VCO153_ pic.gif
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> Crow
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> /∗∗/
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