Cgs synth

>Hello, I'm new to this forum. I started building the VCO and I just have a

few more little parts to get and solder in. I'm not a super-experienced
builder so there's one thing I'm a bit confused and insecure about. In the
instructions he gives Modifications to the different versions of the PC
board. I have version 0.4 of the PC board. The first mod in the REV. 0.4 is
this:

>
>["Cut the track between Pin 5 of the TL072 in the bottom right corner and

the 47uF capacitor. Make the cut near the capacitor."]

>
>I can't find anywhere that pin 5 of the TL072 is connected to the 47uF

capacitor. Pin 5 seems to be connected to a pad that is supposed to be a
jumper wire. And that's another thing, in the Modifications for version 0.2
it says to remove the jumper between pin 5 and the WS Trim. Should I still
not put in the jumper or should I go ahead and do it since this is a later
version.

>
>["Jumper pin 5 to the Saw AC output terminal via a 100k. This will set PWM

control to 50% at 0 volts."]

>
>So, disregard the jumper that's marked on the PC board and just solder in a

100K resistor between the hole at pin5 and the hole at Saw AC output?

>
>["It is possible to place the resistor in place of the link on the PCB

though the track modification is still required."]

>
>I'm not sure what "link" means here.
>
>["Replace the 330k resistor near the SYNC pad with a 220k resistor. This

should stop clipping."]

>
>I couldn't find any 330k resistor in this area.
>
>One more thing. He give a schematic for "Power rail decoupling for the

VCO". I have no idea what decoupling means. I have a Blacet power supply
with -15, 0, +15. Does that mean I don't have to do any modifications to the
PC board?

>
>Sorry if these are really dumb questions, any help would be greatly

appreciated.Thank you for your patience!

>steve
>

_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

>["Cut the track between Pin 5 of the TL072 in the bottom right corner and

the 47uF capacitor. Make the cut near the capacitor."]

>

>I can't find anywhere that pin 5 of the TL072 is connected to the 47uF

capacitor. Pin 5 seems to be connected to a pad that is supposed to be a

jumper wire. And that's another thing, in the Modifications for version 0.2

it says to remove the jumper between pin 5 and the WS Trim. Should I still

not put in the jumper or should I go ahead and do it since this is a later

version.

>

>["Jumper pin 5 to the Saw AC output terminal via a 100k. This will set PWM

control to 50% at 0 volts."]

>

>So, disregard the jumper that's marked on the PC board and just solder in a

100K resistor between the hole at pin5 and the hole at Saw AC output?

>

>["It is possible to place the resistor in place of the link on the PCB

though the track modification is still required."]

>

>I'm not sure what "link" means here.

>

>["Replace the 330k resistor near the SYNC pad with a 220k resistor. This

should stop clipping."]

>

>I couldn't find any 330k resistor in this area.

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