Tuesday 26 March 2019

Buffered Multiple with LED indicator

Multiples aren't the sexiest thing to build but they are essential in any system.
Really easy to build.
The choice is between buffered and un-buffered.

Building a buffered one today.

Here is the breadboarded test circuit.

The basic schematic


The opamp can be a TL084 or TL074
The pinout is identical for both ICs


This particular circuit uses a 074


One change I decided to make was to add a LED to give some sort of indication as to the type of signal this multiple was carrying.
Inspired a bit by the makenoise CV bus

To quote the manual:
"The CV Bus was originally designed for Alessandro Cortini's personal Make Noise system. It provides visual indication of level, rate and polarity for up to 4 control signals that will be shared throughout a patch. ..."
The MN CV bus is I understand passive/unbuffered & those jacks have LEDs built into them.

Here is my 1st perfboard 2HP module.

And the rear
I used a 1K LED resistor. ... experiment a bit.
This LED is standard so will only indicate rate & level.
I'll need to use a bipolar LED to get an indication of polarity.


It works !

I'll build a few versions with different coloured LEDs and try some bipolar ones too.


Bipolar LEDs work well.
(cATHODE  to ground)
Use a 470R resistor for green-red LEDs



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