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Nocto Loco mods [message #1863]

Fri, 11 April 2008 17:39

spiderfingers
Messages: 6
Registered: April 2008

Junior Member

I want to do the Mondo Loco mods...or at least octave level controls. Would someone please provide info on that?

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Re: Nocto Loco mods [message #1865]

Fri, 11 April 2008 19:14

kriista
Messages: 24
Registered: December 2007

Junior Member

I could be wrong, but from the look of the schematic, all you'd need to do is remove the 3position switch and wire each octave (pins 9, 11, and 12)(which are running all the time) to separate pots.

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Re: Nocto Loco mods [message #1870]

Mon, 14 April 2008 14:49

spiderfingers
Messages: 6
Registered: April 2008

Junior Member

Interesting! That is very helpful thank you. I wonder what size pots would work best for this? ...100k same as the volume and pulse or something else?

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Re: Nocto Loco mods [message #1879]

Mon, 28 April 2008 14:29

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

We use 10k pots, with 47k resistors to mix the signals together.

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Re: Nocto Loco mods [message #1882]

Fri, 09 May 2008 00:18

spiderfingers
Messages: 6
Registered: April 2008

Junior Member

Thanks Dan. It isn't exactly working. Good sound level and pulse is is coming through ..a good fuzz but unfortunately with no 8ave effects. I wired the 3 rotary "positions" coming off of the ic pin at 9, 11, 12 to the 1 lug of 3 separate 10k pots. I wired the 2nd lug off of each pot to ground at the sleeve of the output jack. Then I wired a 47k resistor to the 3rd lug of each pot and the other end to a wire. All three of those wires connected to the main rotary "pole". The places I wired to are the only 4 traces on that rotary but there is no change whatsoever when I tweak the pots. Please let me know.

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Re: Nocto Loco mods [message #1883]

Fri, 09 May 2008 14:19

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

sounds like you have the ground and signal reversed on your 10k pots. Try wiring lug 1 to ground, lug 2 to the IC pins 9/11/12, and lug 3 to the 47k's which tie together and make their way to the 2N5089

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Re: Nocto Loco mods [message #1885]

Sat, 10 May 2008 14:01

spiderfingers
Messages: 6
Registered: April 2008

Junior Member

Thanks...you're a genius...it sounds great!

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Re: Nocto Loco mods [message #2062]

Wed, 07 January 2009 14:19

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

OK, I finally posted the mondo wiring diagram on the kits wiki. Here's a direct link: http://www.commonsound.com/kits/lib/exe/fetch.php?cache=cach e&media=wiki%3Anocto%3Amondo%3Amondo_wiring.pdf

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Re: Nocto Loco mods [message #2071]

Thu, 15 January 2009 11:44

androidinmotion
Messages: 6
Registered: December 2008

Junior Member

Speaking of the Mondo Nocto mods, is it possible to order a mondo nocto kit? There's no listing on the kits page on 4ms, but could we get the components/box along with the regular nocto kit via special request? I'm asking because I'm thinking of ordering soon, and I wanted the extra controls. Thanks!

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Re: Nocto Loco mods [message #2076]

Fri, 16 January 2009 13:58

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

I don't have a parts list, so yes you could get them on special request until i get it together... email me if you're interested

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Re: Nocto Loco mods [message #2327]

Thu, 29 October 2009 11:57

Johannes
Messages: 2
Registered: September 2009
Location: Germany

Junior Member

I wired my mondo nocto loco the way it is in the wiring diagram. it mostly works alright but how do i adjust the additional trim pot?
also all the pots are more like switches between loud and silent. i guess logarithmical potentiometers are better or might there be a mistake somewhere?

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Re: Nocto Loco mods [message #2328]

Thu, 29 October 2009 13:56

dann
Messages: 829
Registered: December 2002
Location: Austin TX

Senior Member

It's tricky to tweak the mondo so that the pots act more like linear controls (rather than on/off switches), but it's possible. this is what the extra 25k trim pot is for, it adjusts the bias of the transistor that's responsible for mixing the pulse and octave sections. Without using an oscilloscope, you just have to try the trim pot at different settings until you find one where the pots act better. Usually I turn one of the octave knobs up half-way and adjust the trim pot until I get a middle-range volume, then I turn a second octave pot up half-way and make sure its volume comes in clearly without making the overall volume swell too much. It's a balancing act.

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