Carl Martin - The Fuzz

apollomusicservice · Post by **apollomusicservice** » 16 Dec 2013, 10:47

For all of fuzz funs here's is one more fuzz.

Bill_Mountain · Post by **Bill_Mountain** » 16 Dec 2013, 11:25

Thanks for this. I had considered picking one up to try with my bass but the price scared me a little bit. I also assumed it was a transistor fuzz.

tube-exorcist · Post by **tube-exorcist** » 16 Dec 2013, 23:38

Could it be that R4 should be connected to pin 2 (instead of pin1) of IC1A ?

apollomusicservice · Post by **apollomusicservice** » 17 Dec 2013, 08:18

This is not the case with this device.

tube-exorcist · Post by **tube-exorcist** » 18 Dec 2013, 17:29

apollomusicservice wrote:This is not the case with this device.

Thanks for clarification. So R3, R4, C3, C4 are not needed in this circuit (like so many other parts). Unbelievable that Mr. "Carl Martin" is taking money for such a thing.

apollomusicservice · Post by **apollomusicservice** » 18 Dec 2013, 18:10

may be interesting next to last stage of IC4A with divider R25 /R24 (negative gain)

Dirk_Hendrik · Post by **Dirk_Hendrik** » 22 Dec 2013, 22:03

Don't you mean "gain smaller than 1"? Any inverting amplifier stage gives negative gain and usually it can go up to damn loud!

So smaller than one but also at a lowered output impedance. Does gain always need to be >1 if there's other deliverables available?

Dirk_Hendrik · Post by **Dirk_Hendrik** » 22 Dec 2013, 22:10

apollomusicservice wrote:This is not the case with this device.

With that photo,
What I still do appreciate about CM is that they still seem to be able to etch their own boards without any screenings as well as handbuild their stuff (really handbuilt!) , Instead of having to resort to China and all that crap and are able to stay competitive. I'll consider it a, though not that unexpected, sad day when CM goes belly up under the "jojo" competition.

apollomusicservice · Post by **apollomusicservice** » 26 Dec 2013, 09:29

Yes of course, I thought less than 1 (pardon my unpunctilious response) but I still missing something in this concept. After 3 band EQ
(50Hz, 1kHz and 10 kHz all +/-20dB) and IC4B, which has low output impedance, putting IC4A as attenuator (or impedance matcher)
to potentiometer P4 and after that IC1B as matcher making me confuse. After all of that signal is out of phase in relation with input signal
which is very "unuseful" if you are using this effect in some parallel loops with some other effects.
I also appreciate handbuild and I do not think that PCB's needs silk screening for good work but they certainly need good shield against
rust especially high priced fuzz.

Duckman · Post by **Duckman** » 26 Dec 2013, 20:09

Sorry 'bout my ignorance but... that B1 diode bridge at the gain opamp... What would be its function?

tube-exorcist · Post by **tube-exorcist** » 26 Dec 2013, 20:51

Duckman wrote:Sorry 'bout my ignorance but... that B1 diode bridge at the gain opamp... What would be its function?

Ever heard of a MXR Distortion+ ? That´s basically the function (with three diodes in series each, therefore higher output level)

Duckman · Post by **Duckman** » 26 Dec 2013, 21:52

Thanks for the sarcasm

Clearly understand the bridge diode as a simmetrical cliping, but the 4148 across intrigues (ence, confused) me.

Thanks

Duckman · Post by **Duckman** » 26 Dec 2013, 21:54

I mean, hence

tube-exorcist · Post by **tube-exorcist** » 27 Dec 2013, 00:50

Duckman wrote:Thanks for the sarcasm
Clearly understand the bridge diode as a simmetrical cliping, but the 4148 across intrigues (ence, confused) me.
Thanks

Oh thats easy to understand:
positive halfwave: upper left diode > 1N4148 > lower right diode > gnd.
negative halfwave: upper right diode > 1N4148 > lower left diode > gnd.

Its an old marshall trick to save 1 diode and 6 solder joints (only 2 components to assemble instead of 6) - have a look at the Marshal 2205 or 2210 schematic.

Duckman · Post by **Duckman** » 27 Dec 2013, 02:03

Ok, 100% clear for me now. Thanks again.

Carl Martin - The Fuzz [schematic]