TTSH Mod Sync Option
from Muffwiggler thanks to all supporters
Note: Green part (sync source) sits on one VCO (e.g. 1), red part (sync destination) sits on another VCO (e.g.3)!
As you can see the signal at the sync switch wires is pretty high (signal is a buffered, -5.6V to +14.4V pulse of 2us width with sync, or -9V DC at Q11-Gate when sync is off), and it controls a switch.
There is only a problem when the large switching spikes couple from one side of the On/Off switch to the other, it is still syncing somewhat then, even if it should be off.
The large signals may bleed into other circuits.
Therefore it might be a good idea to run them shielded, especially when they are longer.
They are not "noise sensitive" like a high impedance audio node. As long as the FET (Q11) stays off when sync is disengaged nothing really happens.
TESTED Version with SPST switch by nordcore:
When the switch is open the GATE side is relatively sensitive, if you cross both cables the few pF between the cables are enough to give some "soft sync" effect.
It should be better, if you stay with the Odyssey version (which requires a SPDT switch, which I don't have ).
Source Side:
Plan:
in real world:
second pcb:
in real:
