Correcting:
Base 1 and 2 are identical. Both have input jacks, thru jacks, and pots.
Pot tab designations assume the pot is oriented so the tabs are on top, and
looking from the back of the pot.
Base 1 input jack to Base 1 thru jack to Base 1 pot left tab (CCW)
Base 1 pot middle tab to IN on PCB, 100K resistor.
Base 1 pot right tab to ground.
Base 2 is identical, except you need to add an extra 100K resistor that
isn't on the PCB. It solders to Base 2 pot middle tab on one end, and to
IC1 pin 2 (the summing node) on the other.
Use the same concept for the CV MOD 1 & 2. The extra 100K resistor for CV
MOD2 solders to IC1 pin 13.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
Base 1 and 2 are identical. Both have input jacks, thru jacks, and pots.
Pot tab designations assume the pot is oriented so the tabs are on top, and
looking from the back of the pot.
Base 1 input jack to Base 1 thru jack to Base 1 pot left tab (CCW)
Base 1 pot middle tab to IN on PCB, 100K resistor.
Base 1 pot right tab to ground.
Base 2 is identical, except you need to add an extra 100K resistor that
isn't on the PCB. It solders to Base 2 pot middle tab on one end, and to
IC1 pin 2 (the summing node) on the other.
Use the same concept for the CV MOD 1 & 2. The extra 100K resistor for CV
MOD2 solders to IC1 pin 13.
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com
> -----Original Message-----
> From: cgs_synth@yahoogroups.com [mailto:cgs_synth@yahoogroups.com] On
> Behalf Of sasami@...
> Sent: Tuesday, February 13, 2007 1:25 PM
> To: cgs_synth@yahoogroups.com
> Subject: Re: [cgs_synth] question regarding CGS37
>
>
> >Okay, so let me try to get it right (and i surely will write a more
> >detailed information on my page
> >for all the others who have a similar design:
> >
> >BASE1 jack goes to THRU jack then to BASE 1 pot right. middle BASE1
> >pot to IN pad on the pcb.
>
> Base 1 pot CCW end goes to 0V as well. This is so the pot forms a voltage
> divider. Normally the F connection goes to the through jack, so it
> accurately follows the input. Adding the pot messes thing up, so we will
> save the trhu function for the BASE2 input. So no connection to thru here.
>
> >BASE2 jack goes to THRU jack then to BASE 2 pot right, middle base 1
> >pot to 100k ohms resistor, then to
> >IN pad on PCB.
>
> No. Base 2 jack goes to a 100k resistor (ordinary resistor) and the thru
> jack. The other end of the resistor goes to pin 2 of the first chip.
> Note: Base 2 is a direct input. The pot does not affect it.
>
> >The same applies to CV mod 1/2.
>
> The CV MOD 1 is wired to a pot in much the same way.
> The CV MOD 2 is wired to two normal 100k resistors. The other end of one
> resistor goes to pin 13 of the first chip. The other end of the second
> resistor goes to pin 6 of the first chip.
>
> >2) My assumption for the other pads (please tell me if i'm right:)
>
> The top half is upside down.
>
> >S/T pads are for the connection to EVEN/ODD SPDT
> Correct.
>
> Corrected:
> >pad A - TOP
> >pad B - UP4
> >pad C - UP3
> >pad D - UP2
> >pad E - UP1
> >pad F - Not used this time.
> >pad K - DOWN1
> >pad J - DOWN2
> >pad I - DOWN3
> >pad G - DOWN4
> >PAD H - BOTTOM
>
>
> Ken
> _______________________________________________________________________
> Ken Stone sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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>
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>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
>
>