MOTM

Hi All -

I'm in need of several AR-type EGs.  Does anyone know of small
boards/kits for such beasts?  Tony used to sell some as I recall, but,
well...

Thanks,

Mike

An AR EG is one of the simplest circuits to make. All it takes is two 
diodes, two pots, one cap, and an op-amp voltage follower. Maybe a 
couple more resistors to trim the output down depending on how large 
your gate signal is. You can easily build this on one of my MUUB 
boards.

>I'm in need of several AR-type EGs.  Does anyone know of small
>boards/kits for such beasts?  Tony used to sell some as I recall, but,
>well...
>

Cool!  Assuming (and this would be a good assumption) that I am
completely lame when it comes to electronics, is there somewhere where
a circuit like this is diagrammed?  How many EGs on one of your big
MUUBs? 4?

Thanks, Scott...

Mike

--- In motm@yahoogroups.com, Scott Juskiw <scott@t...> wrote:

>
> An AR EG is one of the simplest circuits to make. All it takes is two 
> diodes, two pots, one cap, and an op-amp voltage follower. Maybe a 
> couple more resistors to trim the output down depending on how large 
> your gate signal is. You can easily build this on one of my MUUB 
> boards.
> 
> >I'm in need of several AR-type EGs.  Does anyone know of small
> >boards/kits for such beasts?  Tony used to sell some as I recall, but,
> >well...
> >
>

Using the simplest possible AR (one op-amp per EG), you can fit 4 of 
them on a MUUB-4. If you want a fancier circuit, then you'll get 2, 
or 1 EG per MUUB-4. I'm not publishing any MUUB circuits until after 
the contest is over (Dec. 1). This might be a good contest entry 
(hint hint).

>Cool!  Assuming (and this would be a good assumption) that I am
>completely lame when it comes to electronics, is there somewhere where
>a circuit like this is diagrammed?  How many EGs on one of your big
>MUUBs? 4?
>

Well, it isn't quite that simple.  You want the output levels to be 
independent of the gate level, so that requires internal gate 
processing.  You also want a good curve on the release, so it reaches 
cutoff at zero after a reasonable time.  A nice example for an AR EG is 
found in Electronotes #92, p. 13.  Ian Fritz published a design that 
derived from an earlier idea by Carl Hovey in EN#31.  I would use 
different gate processing than Ian's, which is TTL based.  I am thinking 
of breadboarding this on a MUUB-4 and entering the contest.  It will be 
interesting to compare three different AR EGs on the MUUB-4, with 1, 2, 
or 4 EG circuits.

-Richard Brewster

Scott Juskiw wrote:

>Using the simplest possible AR (one op-amp per EG), you can fit 4 of 
>them on a MUUB-4. If you want a fancier circuit, then you'll get 2, 
>or 1 EG per MUUB-4. I'm not publishing any MUUB circuits until after 
>the contest is over (Dec. 1). This might be a good contest entry 
>(hint hint).
>
>  
>
>>Cool!  Assuming (and this would be a good assumption) that I am
>>completely lame when it comes to electronics, is there somewhere where
>>a circuit like this is diagrammed?  How many EGs on one of your big
>>MUUBs? 4?
>>
>>    
>>
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