Yamaha CS80

Hi.

The schematic is in the same photo group on the site:
https://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/35984432/lightbox/1778166358?orderBy=ordinal&sortOrder=asc&photoFilter=ALL#zax/1778166358 <https://groups.yahoo.com/neo/groups/yamahacs80/photos/albums/35984432/lightbox/1778166358?orderBy=ordinal&sortOrder=asc&photoFilter=ALL#zax/1778166358>

It’s basically the same circuit that’s on the output of the KAS board.  If GATE is -6.5v (or around that - which is a “1”), the transistor is off so the 12k resistor pulls one side the LED to a positive voltage. The other side of the LED is ground, so this lights one of the two colored LEDs in the package.  If GATE is +8.5v (which is “0”), the transistor is on, pulling the LED to a negative voltage which lights the other color LED.  Or maybe I got it backwards.  Anyway, if it’s the other way, just flip the wires from the LED around :)

 David



> On Nov 5, 2014, at 12:41 PM, r_j_d_2.phila@... [yamahacs80] <yamahacs80@yahoogroups.com> wrote:
> 
> hi all, so i was looking over the data on the rogoffs.com <http://rogoffs.com/>, and found images for the KAS wiring for the trigger LED, which i'm thinking of tackling. however, does anyone have the schematics/layout of the breadboard? thanks much, RJ