On 5/12/08, wjhall11 put forth:
>Thanks much for the clarification, Mark - but Jurgen did say this in
>his note to us:
>
>"The Tau needs two separate LEDs, I'm afraid. (Unless someone offers a
>dual LED with 4 pins, i.e. sharing neither anode nor cathode.)"
>
>So I guess a three lead dual-color LED won't work either according to
>Jurgen. <shrug>
I just checked the E-M forum, and I did not find JH saying that a
three-wire LED would work for the LFO (it was for the bypass option).
My bad.
On both the pcb and the schematic, the one end of each LED is
connected to a common point (the output of the LFO), which is why I
said an three wire LED would work, but the schematic shows the
cathode of one LED, and the anode of the other LED connected to the
common point. I wasn't expecting that, as most three-wire LED's are
common cathode. The pcb is labeled like this:
Up Down
- + - +
Assuming that "+" means anode, and "-" means cathode, a three-wire
LED won't work, or at least I can't find any wired that way.
Oh well, if you still wanted to use a bipolar LED, even an MOTM-style
one with two-wires, you could take the LFO out and build a driver
circuit on a little daughter board....