Author Topic: Basic Non Inverting Amplifier Schematic  (Read 647 times)

Animalbeats

Basic Non Inverting Amplifier Schematic
« on: March 05, 2021, 08:11:40 AM »
Basic Non Inverting Amplifier Schematic  wanted to explore different op-amps, help is much appreciated.

antonis

Re: Basic Non Inverting Amplifier Schematic
« Reply #1 on: March 05, 2021, 08:23:04 AM »
Hi & Welcome..

On what particular circuit/effect you want to "explore" different op-amps..??
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

Animalbeats

Re: Basic Non Inverting Amplifier Schematic
« Reply #2 on: March 05, 2021, 08:26:11 AM »
A simple buffer is all I'm after, I'm trying to create a neutral buffer at first, and then perhaps 10dB of gain if I can figure that out.

Bunkey

Re: Basic Non Inverting Amplifier Schematic
« Reply #3 on: March 05, 2021, 11:15:25 AM »
You might like this.

http://philsal.co.uk/wp-content/uploads/2018/12/Analogue-Guitar-Pedal-Design.pdf

I believe it contains a simple recipe for what you're after (page 7), along with a lot of other useful building blocks for guitar pedals.

Check the datasheet for the sepecific opamp you're using too, that will tell you most things you need to know about its implementation.
« Last Edit: March 05, 2021, 11:18:26 AM by Bunkey »

ElectricDruid

Re: Basic Non Inverting Amplifier Schematic
« Reply #4 on: March 05, 2021, 11:37:11 AM »
You could try these too:

https://electricdruid.net/wp-content/uploads/2021/03/StompboxBuffers-scaled.jpg


In the schematic it's marked as half of a TL072, but that doesn't make much sense for a single op-amp. Use whatever suits.
For the buffer-with-gain, you can experiment turning R11 into a 100K pot for variable gain.

HTH

Animalbeats

Re: Basic Non Inverting Amplifier Schematic
« Reply #5 on: March 05, 2021, 12:16:35 PM »
 Thankyou guys for your input.

 The Pedal Design PDF looks simple yet informative.

 And the Electric Druid looks super simple. 

GibsonGM

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Re: Basic Non Inverting Amplifier Schematic
« Reply #6 on: March 05, 2021, 01:26:28 PM »
Welcome, Animal.  If you are using a single opamp, like a TL071, don't forget to double-check the pinout, because they are different!  Disregard if you already knwo this  :) 
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Animalbeats

Re: Basic Non Inverting Amplifier Schematic
« Reply #7 on: March 05, 2021, 06:26:45 PM »
You could try these too:

https://electricdruid.net/wp-content/uploads/2021/03/StompboxBuffers-scaled.jpg


In the schematic it's marked as half of a TL072, but that doesn't make much sense for a single op-amp. Use whatever suits.
For the buffer-with-gain, you can experiment turning R11 into a 100K pot for variable gain.

HTH


I can't find this on his site, can you help?

Animalbeats

Re: Basic Non Inverting Amplifier Schematic
« Reply #8 on: March 05, 2021, 06:37:04 PM »
How would you design the circuit to go from 0 to unity, then have an additional 10db amplification available by separate pot?

Answers on a post card :)

iainpunk

Re: Basic Non Inverting Amplifier Schematic
« Reply #9 on: March 05, 2021, 07:28:44 PM »
replace the 22k r11 with a 50k potentiometer. you can leave out the 1k if you want.


cheers
half man - half snail - 6 feet to scale - Snail man's - not frail - He's been - to jail - snail man is fuccing real
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bluebunny

Re: Basic Non Inverting Amplifier Schematic
« Reply #10 on: March 06, 2021, 06:01:21 AM »
Check this out too:

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Ohm's Law - much like Coles Law, but with less cabbage...

antonis

Re: Basic Non Inverting Amplifier Schematic
« Reply #11 on: March 06, 2021, 07:27:45 AM »
How would you design the circuit to go from 0 to unity,

We wouldn't 'cause unity is the minimum gain for non-inverting configuration..
« Last Edit: March 06, 2021, 07:46:07 AM by antonis »
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

Gus

Re: Basic Non Inverting Amplifier Schematic
« Reply #12 on: March 06, 2021, 07:52:19 AM »
Do searchs here for
"buffer"
"IC buffer"
"opamp buffer"
there have been many posts and thread over the years.
Or read some books

maybe some opamp inputs should have diode clamps

"Neutral" is is something that does not make sense.
Even with a distortion less stage the input resistance interacts with the pick-ups volume, tone control, cable etc.
Neutral to what?
10k will sound different to 1 meg etc
Then what RC HPF  will the stage have?
Too low a frequency can "mud up" by boosting lows
and more things



https://www.diystompboxes.com/smfforum/index.php?topic=93699.0

GGBB

Re: Basic Non Inverting Amplifier Schematic
« Reply #13 on: March 06, 2021, 10:44:36 AM »
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ashcat_lt

Re: Basic Non Inverting Amplifier Schematic
« Reply #14 on: March 06, 2021, 12:42:09 PM »
We wouldn't 'cause unity is the minimum gain for non-inverting configuration..
Well, they said "separate pot", and that's as simple as putting a Volume pot after the gain stage.  It works the opposite of the way they said - unity to +10db, then turn that down - but this is better for S/N reasons, which is why it's pretty much standard procedure.  You can put the knobs physically on the pedal whichever way makes most sense to you.

ElectricDruid

Re: Basic Non Inverting Amplifier Schematic
« Reply #15 on: March 06, 2021, 03:13:35 PM »
I can't find this on his site, can you help?

The full-size schematic is on the site at the link I posted:

https://electricdruid.net/wp-content/uploads/2021/03/StompboxBuffers-scaled.jpg

It doesn't feature anywhere else because I only chucked it up there when you asked about it!

These circuits are absolutely standard, absolutely basic "building block" stuff. I put a buffer like this on the front of pretty much every pedal I design, and I'm not the only one! Here all I did was put an output cap on it so it can be used alone.
Buffers like these make the pedal largely indifferent to what feeds it, so it can give a reliable result in *any* situation, unlike some older pedals that are really fussy and people spend ages on forums discussing whether they sound better after this or that - that's a sign of a dodgy design! If it's well-designed, it should sound good whatever you plugged into it, and whatever you plug it into. That's pretty fundamental!
« Last Edit: March 06, 2021, 05:06:14 PM by ElectricDruid »
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iainpunk

Re: Basic Non Inverting Amplifier Schematic
« Reply #16 on: March 06, 2021, 03:50:21 PM »
How would you design the circuit to go from 0 to unity,

We wouldn't 'cause unity is the minimum gain for non-inverting configuration..
yes, 0db is unity!
half man - half snail - 6 feet to scale - Snail man's - not frail - He's been - to jail - snail man is fuccing real
『snailpilled』

antonis

Re: Basic Non Inverting Amplifier Schematic
« Reply #17 on: March 06, 2021, 04:44:35 PM »
yes, 0db is unity!

I don't think OP has got the slightest idea about decibels..

I even think he hasn't got the slightest idea about his own queries, but let it be..
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..