[sdiy] VCLFO core circuit..

[Tim Parkhurst]

On Thu, Mar 8, 2012 at 5:44 AM, Jean-Pierre Desrochers
<jpdesroc at oricom.ca> wrote:
>
> I'm about to start building a set of  VCLFO modules
> for my synth so I browsed  a lot around
> to check for existing designs..
> I need it to track with 1v/oct input,
> (exponential response) but it would have lin inputs too.
> Most of the designs I saw use matched pairs of transistors
> for their expo converter part and sometimes
> hard to find parts.

Instead of the ARP VCO, I might go with something like this:
http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html

This VCO is based on the 3080 chip (still fairly easy to find, or
replace it with a 13700), has a linear FM input, and uses two PNP
transistors in the expo converter. This will be a simple circuit to
build, and will be more than adequate for VCLFO use.


Tim (slightly more than adequate) Servo
---
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings