not so new But... pop when switching parallel TBM caps

[madnis]

Tone Stack set up to switch from Marshall to Fender
4PDT on-on. Pops when switched?
 
(Sorry this went way off topic
Schematic 07-29-2024 correct
let me know if you see errors)

[sluckey]

Tone Stack set up to switch from Marshall to Fender

Nice idea.

[PRR]

> I can't figuire out where to put "pull downs" on TMB TS parallel caps?!

The Fender and Marshal tonestacks use the tone caps AS blocking for DC.

You need to add a large cap in front.

DRAW A PICTURE! We can't talk about it all arm-wave abstract.

[madnis]

Schematic 07/31/24
(Not shown in schem.
Zero Loss effects loop between
tone stack treble out and MV)

Went with switch for gain stage
10k/4.7k/2.7k

Add 1.2k and 16uf to de-couple V1

Decided to use PIO coupling caps
V1a & V1b .047uf and .01uf

[sluckey]

Check with sluckey. He gets it.

NOT SO!

[PRR]

https://el34world.com/Forum/index.php?topic=4207.0

[madnis]

My sincerest apologize to both of you. I thought
I was presenting my idea and implementation in
the venaculer of the posts I'd been reading over
the years. (sluckey when you said "nice idea"
I thought that meant I'd conveyed my thoughts
and I was happy that it was understood.)

[sluckey]

Now was that so hard? Certainly much clearer than your verbose description.

My "Nice idea" comment was just fluff. My real comment was in my signature line. 

Anytime you switch capacitors in an audio signal path you are very likely to cause a pop. Many times you can avoid the pop by placing a high value resistor across the switch contacts. Easy to try. No guarantees though.

[madnis]

Yep, that worked.

6.8meg across switch

Thank you all for the response!

[sluckey]

No annoy. I play with you 'til you get it.   

[madnis]

I will live by from now on


"A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!"

[tubenit]

Just an idea for discussion.  Not saying this would work well.  If it did work, I'd think one would have to switch settings between songs and not on the fly.


With respect, Tubenit

[madnis]

Schematic: "2 For 1 SE EL34 "

I'm using Digikey Schem-it
to draw these.

Schematic 07/31/24
Zero Loss effects loop between
tone stack treble out and MV

Went with switch for gain stage10k/4.7k/2.7k

Decided to use PIO coupling caps
V1a & V1b .047uf and .01uf

[pullshocks]

Years ago the late Steve Ahola had a couple designs, the Promaniac and Son of Promaniac that featured tone stack switching


sopm_1.pdf (blueguitar.net)


https://blueguitar.net/new/schem/blue_gtr/promaniac/pro_man7.pdf

[madnis]

07/31/2024

max. dissp. ~88%

329 plate
320 screen
303 A to K     
-20 at K
~65ma