CGS48 corrections
2004-01-10 by sasami@hotkey.net.au
It seems I've made a blunder int the PWM section of the CGS48 VCO board. THe
schematic is correct.
Modifiactions needed are as follows:
Replace 330R connected to "SQ" pad with 1k.
Swap 1k and 1k8 resistors connected to "PWM" pad with each other.
Cut the track between these 1k8 and 1k resistors.
Jumper between "SQ" pad and the freshly isolated end of what is now the 1k8
resistor.
Remove jumper between Pin 5 of TL072 nearest the SAW out pads and the 22k
"WS TRIM" trimmer.
Jumper pin 5 of the TL072 to "SAW OUT (AC)" pad.
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
schematic is correct.
Modifiactions needed are as follows:
Replace 330R connected to "SQ" pad with 1k.
Swap 1k and 1k8 resistors connected to "PWM" pad with each other.
Cut the track between these 1k8 and 1k resistors.
Jumper between "SQ" pad and the freshly isolated end of what is now the 1k8
resistor.
Remove jumper between Pin 5 of TL072 nearest the SAW out pads and the 22k
"WS TRIM" trimmer.
Jumper pin 5 of the TL072 to "SAW OUT (AC)" pad.
_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>