Mutron Micro V

[Jason D]

Has anyone experimented with this?

I have it on my breadboard right now. Sounds, well, alright.
I like my MXR EF better. But I would like to make this thing sound good.

What could I do to change the Attack rate?

[Jason D]

anyone? Mark Hammer?

[mikeb]

You have this on a breadboard, right? From a very, very quick look maybe R7 controls attack, R9 decay? Not sure, but it is easy to find out anyway! Let us know!

Mike

[Manolo Dudes]

Have a look at this:

http://diystompboxes.com/sboxforum/viewtopic.php?t=18134

[mikeb]

That doesn't answer the question though ... does it?  :?

Mike

[Manolo Dudes]

Yes, it answers the *first* question  

[Jason D]

I will work on it and see what I find. There aren't that many parts, aleast not resistors, so I will play around and see what happens.

[Mark Hammer]

The time constants of the envelop e follower are set by  R14 (680R), R15 (47k) and C11 (4.7uf).  Increasing R14 will lengthen the attack time.  Increasing C11 will increase both attack time and decay time, and increasing or removing R15 should increase decay time, although I'm unsure of its effect on the transistor immediately after it.  The simplest thing to do is to have a toggle for fast/slow decay having a stock value and a second cap added in parallel , and a 100R fixed resistor with a 1k variable resistor in series to vary attack time.

Although decay time also plays a role in the feel and responsiveness of an envelope controlled device, attack time plays a much stronger role since every note has a constant attack which will make itself known but notes may have their decay cut short by finger muting, which will override whatever yu've tried to do with decay variation.  My preference is therefor to provide more fine control over attack time, and broad, generic control over decay.

[Jason D]

Thanks. That definitely does it. Using pots for those 2 resistors and swtiching caps gives a whole lot of different sounds. Also messing with the frenquency by chaning the 330R that goes to the CA3080 makes a big difference.