MOTM

In the process of designing a breakout panel for my Encore Expressionist, I
was thinking of putting 8 LED's on the front panel to show gate status. If
i take an LED and wire it in parallel with the gate jack on my breakout
panel will it light? will my modules still respond to the gate signal? Is
there a better way to do this? -Nate

If you wire it directly in parallel to the Gate jack, you will certainly
light the LED but you will not gate the instrument. You need to add a series
resistor to the LED. Try a few K ohms. It will be dim though.

Note: If you are driving insruments that need to be upwards of 10 volts for
the gate, the LED will prevent it from working.

Tony Karavidas
Encore Electronics

http://www.encoreelectronics.com

Designers of "The best MIDI to CV converter on the planet." -Keyboard Oct.
1997

> -----Original Message-----
> From: Nathan Hunsicker [mailto:nate@...]
> Sent: Thursday, June 29, 2000 12:50 PM
> To: motm@egroups.com
> Subject: [motm] LED & Gate Voltage
>
>
> In the process of designing a breakout panel for my Encore
> Expressionist, I
> was thinking of putting 8 LED's on the front panel to show gate status. If
> i take an LED and wire it in parallel with the gate jack on my breakout
> panel will it light? will my modules still respond to the gate signal? Is
> there a better way to do this? -Nate
>
>
>
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I am building one of these right now. To be safe, it will at least take a
transistor (2N3904 for instance) and two resistors to light each LED. That
means you must put a MOTM power connector on a pcb to power the transistors.
If you have gone that far, you may want to consider putting op amp unity
gain buffers on the CV and gate outputs, to make sure you have plenty of
current drive for multiple VCOs and EGs.

I had a panel professionally silkscreened. It is 2U and has 8 CV, 8 gate, 8
gate LEDs, din sync clock, clock LED, sync start, and start LED. I also
intend to connect the rear of the panel to a multipin ELCO connector that
mounts on the back plate of the cab. Then a matching connector goes to a
snake to connect to the Expressionist outputs.

I can send the panel artwork if you're interested, and draw up the circuit
I'm using when I get a little time. It's real simple. I'm using special
opamps to buffer the CVs(LT1013), which have very low dc error or drift. Any
old op amp is OK to buffer the gate signals (I'm using TLO72).

Moe

> -----Original Message-----
> From: Nathan Hunsicker [mailto:nate@...]
> Sent: Thursday, June 29, 2000 2:50 PM
> To: motm@egroups.com
> Subject: [motm] LED & Gate Voltage
>
>
> In the process of designing a breakout panel for my Encore
> Expressionist, I
> was thinking of putting 8 LED's on the front panel to show gate status. If
> i take an LED and wire it in parallel with the gate jack on my breakout
> panel will it light? will my modules still respond to the gate signal? Is
> there a better way to do this? -Nate
>