cmos inverter based designs

rx7speed · 3rd November 2004, 03:07 AM

I'm curious if you guys could explain the whole cmos inverter design when used for guitar applications.
I've tried to search the web for how to bias them into linear operation or how to apply them but I can't find a single thing on how to do it. any help here?

Nasse · 3rd November 2004, 06:44 PM

Maybe Google can help. Try find Graig Anderton Tube Sound Fuzz circuit

Lurking around at guitar diy or schem sites help, lots of there

Nasse · 3rd November 2004, 08:16 PM

Okay straight from my memory which is not very fine today

Inverting cmos stage biases nicely to about half supply when you provide dc path between output and input. It works like negative feedback resistor too. But still sounds somewhat "tubey"

amz-fx · 3rd November 2004, 10:15 PM

Quote:

Originally posted by rx7speed
I'm curious if you guys could explain the whole cmos inverter design when used for guitar applications.
I've tried to search the web for how to bias them into linear operation or how to apply them but I can't find a single thing on how to do it. any help here?

Here's one of my designs that uses cmos buffer as amplifying stages:

regards, Jack

Enzo · 4th November 2004, 12:51 AM

Look at the data sheet for something like the Motorola MC14069UB - I suppose any 4069 would work,but I have the Moto book. I think I would prefer the 4069 to the 4049, but that is just me.

It is a hex inverter, and if you look at the internal circuit you will see it is nothing more than a very basic FET push-pull stage for each section. it is meant to switch logic lines high and low, but it can be used for guitar amps too.

When run with split supplies the in/out center around zero. if you run it one sided you would need to bias the input to about half rail.

rx7speed · 4th November 2004, 06:42 AM

just to make sure I have this right.
a cmos inverter can be used basicly just like any op amp
other then having two input and one output there is only one input and one output? least in basic way of looking at it
are there any special things I need to do to set it up for audio use or just hook it in and go from there like I would a normal op amp ?

Enzo · 4th November 2004, 08:31 AM

It doesn't work like an op amp, it is just a pair of FETs in push pull with their gates tied together. SImple as that.

3rd November 2004, 03:07 AM	#1
rx7speed diyAudio Member Join Date: Oct 2004	cmos inverter based designs I'm curious if you guys could explain the whole cmos inverter design when used for guitar applications. I've tried to search the web for how to bias them into linear operation or how to apply them but I can't find a single thing on how to do it. any help here?

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3rd November 2004, 06:44 PM	#2
Nasse diyAudio Member Join Date: May 2004 Location: Scandinavia	Maybe Google can help. Try find Graig Anderton Tube Sound Fuzz circuit Lurking around at guitar diy or schem sites help, lots of there

3rd November 2004, 08:16 PM	#3
Nasse diyAudio Member Join Date: May 2004 Location: Scandinavia	Okay straight from my memory which is not very fine today Inverting cmos stage biases nicely to about half supply when you provide dc path between output and input. It works like negative feedback resistor too. But still sounds somewhat "tubey"

4th November 2004, 12:51 AM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Look at the data sheet for something like the Motorola MC14069UB - I suppose any 4069 would work,but I have the Moto book. I think I would prefer the 4069 to the 4049, but that is just me. It is a hex inverter, and if you look at the internal circuit you will see it is nothing more than a very basic FET push-pull stage for each section. it is meant to switch logic lines high and low, but it can be used for guitar amps too. When run with split supplies the in/out center around zero. if you run it one sided you would need to bias the input to about half rail.

4th November 2004, 06:42 AM	#6
rx7speed diyAudio Member Join Date: Oct 2004	just to make sure I have this right. a cmos inverter can be used basicly just like any op amp other then having two input and one output there is only one input and one output? least in basic way of looking at it are there any special things I need to do to set it up for audio use or just hook it in and go from there like I would a normal op amp ?

4th November 2004, 08:31 AM	#7
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	It doesn't work like an op amp, it is just a pair of FETs in push pull with their gates tied together. SImple as that.

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