Maestro - MPF-1

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
sta.papad
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Post by sta.papad »

:applause: Thank you very much for your help..! :D Can you explain how can i wire the (on off on) dpdt in the veroboard.?

Strangeamps
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Post by Strangeamps »

heres how to wire the dpdt

Image

heres a schematic that uses the dpdt

Image

Strangeamps
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Post by Strangeamps »

I cant seem to find the original diylc files for it, but heres the layout with some edits regarding the switch and pot connections

Image

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Visualdistortion
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Post by Visualdistortion »

The 2P2T switch it's:

Rotary Switch, 2x6, Pins
Lorlin rotary switch
2 pole 6 positions, (the total number of positions is selectable up to 6. Fix the number of positions using the ring)
or
Rotary Switch, 3x4, Pins
Lorlin rotary switch
3 pole 4 positions, number of positions selectable, (the total number of positions is selectable up to 4. Fix the number of positions using the black ring)
???
Thanks a lot, I've buyed a 2x6 but something it's wrong.
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

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zosotone
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Post by zosotone »

Hi! I'm building the MPF. Can you put the numbers of the lugs on the pots? The wiper it's the second lug? Thank you :thumbsup

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Post by Greenmachine »

zosotone wrote:Hi! I'm building the MPF. Can you put the numbers of the lugs on the pots? The wiper it's the second lug? Thank you :thumbsup
http://www.beavisaudio.com/techpages/Pots/

that site should answer a lot of your questions. welcome to stompbox building.
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"This amp is freakin loud, like crazy, I'm going to kill pets loud." -- mich, 2011

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zosotone
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Post by zosotone »

:slap: Thank you!

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Greenmachine
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Post by Greenmachine »

No problem. Watch your wallet, it'll get ugly.
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"This amp is freakin loud, like crazy, I'm going to kill pets loud." -- mich, 2011

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Post by zosotone »

I have clearly how to wire up the switches. The wipen it's the second lug, but the first and the third of the pots are indifferent? How must I wire up the dual pot? Must I link the lugs of the dual pot?

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Post by Nocentelli »

Link the wipers and connect them to the green wire marked "wipers" next to the frequency label: The other two green wires next to the frequency label must go separately to the two "lug3s" on the dual pot (furthest right when you hold the pot with the shaft pointing towards you and the lugs pointing down). The lug1s are unused.
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Post by zosotone »

Ok! And the other pot (height)? This picture it's correct?
Attachments
MAESTROfinal.jpg

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Post by Nocentelli »

zosotone wrote:Ok! And the other pot (height)? This picture it's correct?
Yep, that looks fine.
brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?

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zosotone
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Post by zosotone »

Thank you men!

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Visualdistortion
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Post by Visualdistortion »

I made the pedal and I can't find where is my problem.
I've got a very big hiss with my signal, and the pots and switch control the amount of hiss :hmmm:

Some clues?
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

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zosotone
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Post by zosotone »

I don't now, I have not done still the pedal...

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Post by marshmellow »

Visualdistortion wrote:I made the pedal and I can't find where is my problem.
I've got a very big hiss with my signal, and the pots and switch control the amount of hiss :hmmm:

Some clues?
Try a new 4007, take antistatic precautions when handling it.

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Post by jazzmaster »

Hi there,

first of thanks to Strangeamps for the quick vero layout!!
Im building this thing for a friend of mine, final assembly & test was today before i color the enclosures.

The build works fine, it seems that freq pot has kinda sweet spot at the heights, maybe this behave is normal because heights are more aggresive than low end to human ear. Near end of the range there is much going on ("sweetspot"), from ccw to that point it does not much. maybe a linear would be better, dodnt have dualpots here on spare so i cant try.
But i need to mention that im only tested it on a small speaker amp on low volume and with the loopstation as signal source (had to use audioprobe because i was getting no signal out of it ;)) also the loop didnt have the whole freqency spectrum of a guitar, i will inspect this tomorrow with a proper amp and a real guitar. will report back for that.

Also i went quickly over the service manual and i have here an updated version for the offboard wiring, which is correct to the schematic.
however height pot needs to be reversed if you mount it on top like on the regular effect. Why ? If you take a look at the original device you
can see pots are on the side, at each one if you think about how they are phisicaly mounted in respect to each other, you find they reversed. So you need to compensate this ;)

zosotone, this might be the porblem then...

greets,
jazzmaster
Attachments
maestro mpf-1 offboard wiring
maestro mpf-1 offboard wiring

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Visualdistortion
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Post by Visualdistortion »

Thanks for your addition, i need to recheck mine
I wanna make it
I wanna make it wit chu
(again and again and again)

French... sorry ;)

Strangeamps
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Post by Strangeamps »

Also to be noted, there's a schematic floating around and archived on Aron Nelson's site that has one component in the wrong spot, rendering the build to be non functional in overdrive mode. Go with the red and green schematic in this thread.

rockain
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Post by rockain »

hello,
i like the circuit but stone deaf´s 5 different Q´s are verry versatile. can somebody tel me how i can make this too? resistor values etc.

thanks

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