[sdiy] VCO PCB finally ordered

[Michael Ruberto]

Hi all,

I just ordered the parts for my VCO from Mouser last night. Ouch, gotta eat 
cheap for awhile. After much careful research I have actually decided to 
have the PCB done by ExpressPCB. I'm using the miniboard service so it was a 
challenge fitting all the parts. But they all fit and only 4 jumpers are 
needed.

http://frankentron.freezope.org/source/SEMVCO_4-3.gif

I have changed the PCB from the previous version. There was a serious 
mistake in the old version. I also added provisions to optionally use an 
external reference voltage to feed the expo converter. This has not been 
updated in the schemo yet but if you view the connection of R11 and +V rail 
this is where it has changed. R11 now connects to a pin on the bottom 
header. This will allow use of either a 15V reference or a 7.5V reference if 
you omit R10 and jumper R11. If no reference will be used then a jumper from 
pin4 on the bottom header to the via in the +V rail next to the header on 
the right can be used.

http://frankentron.freezope.org/source/REV4-2.gif

Once I have a board assembled and tested I'll post the .pcb file on my site 
for anyone interested in building this VCO.

M. A. Ruberto