Author Topic: Adding gain & volume  (Read 352 times)

rangermaster

Adding gain & volume
« on: February 07, 2021, 02:26:14 PM »
Hi there. Maybe a noob question but i cant find anything about it that helps me out.

I would like to try this schematic



Is it possible to add a gain and a volume pot to this ? If so.. what should be good pot values and how/where to add them ?

Thanks !

antonis

Re: Adding gain & volume
« Reply #1 on: February 07, 2021, 02:57:26 PM »
It depends on whether you are satisfied of present configuration gain as maximum one..

If so, you can replace 680R Emitter resistor with with a 500R pot + 180R resistor and wire upper leg of 22μF cap on pot's wiper..

As for Volume control, a 100k pot on output should be fine..

P.S.
Schematic is coming asap..
« Last Edit: February 07, 2021, 03:11:36 PM 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..

rangermaster

Re: Adding gain & volume
« Reply #2 on: February 07, 2021, 03:09:15 PM »
Ok thanks ! I'll wait for your schematic!

antonis

Re: Adding gain & volume
« Reply #3 on: February 07, 2021, 03:11:21 PM »
Here you are..  :icon_wink:



P.S.
You can study Big Muff Π clipping stages 'cause it's just a modified one..
(470k feedback resistor in original design is splitted into 2 X 220k, one of them decoupled by 10nF cap for raising stage input impedance..)
« Last Edit: February 07, 2021, 03:56:16 PM 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..

rangermaster

Re: Adding gain & volume
« Reply #4 on: February 07, 2021, 03:29:55 PM »
Thanks man! That's quick

I'll try this tomorrow and see if i can understand these schematics!

Normally i use those vero layouts

rangermaster

Re: Adding gain & volume
« Reply #5 on: February 07, 2021, 05:23:48 PM »
I think you mean a 500K pot with a 180ohms resistor ?

antonis

Re: Adding gain & volume
« Reply #6 on: February 07, 2021, 05:50:26 PM »
I think you mean a 500K pot with a 180ohms resistor ?

Definately not..!! :icon_wink:

500k for Emitter resistor should keep the transistor permanently topped..
500R (Ohms) in series with 180Ohms make 680Ohms as in original schematic..
It could be a single 680Ohms pot if only it could be commercially availiable.. :icon_wink:
"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..

rangermaster

Re: Adding gain & volume
« Reply #7 on: February 07, 2021, 05:53:35 PM »
Ah ok. Well i dont have any ohm pots here.. just K pots. 10, 250, 500 etc

I'm still a little confused about how to wire the resistors/caps to or from the pot in this schematic. Just a nother noob thing though  :icon_rolleyes:

antonis

Re: Adding gain & volume
« Reply #8 on: February 07, 2021, 06:16:28 PM »


You can use 250k pot instead of 100k one without any issue.. :icon_wink:
(considering next stage input impedance high enough..)
"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..

rangermaster

Re: Adding gain & volume
« Reply #9 on: February 08, 2021, 02:51:32 AM »


You can use 250k pot instead of 100k one without any issue.. :icon_wink:
(considering next stage input impedance high enough..)

thanks man !

antonis

Re: Adding gain & volume
« Reply #10 on: February 08, 2021, 06:18:38 AM »
Lets make it more clear.. :icon_wink:




***UNVERIFIED*** ***UNVERIFIED*** ***UNVERIFIED***
"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..