Author Topic: ToneBender MK II level pot  (Read 1180 times)

Arangonix

ToneBender MK II level pot
« on: June 28, 2020, 06:09:35 AM »
Hi guys,

need some tips with my breadboarded bender. I built it using Sola Sound Tone Bender Professional MKII layout:

https://www.diystompboxes.com/smfforum/index.php?topic=111775.0

It works as "not-biassed-correctly" and "you-used-unmatched-trannies" should work, but it's definitelly a bender tone :D I have a problem with pots placing. The attack pot was kinda easy, I put 1st pot lug to ground, 2nd  to groud with electrolitic in between and 3rd to Q3 emiter. It works fine. The level pot is a mystery for me :) I put 1st pot lug to ground, 3rd to the output cap "output" but I don't have an idea where 2nd (central) pot lug shuld go. Any suggestions?
White wires go from attack pot, yellow ones from level pot.
Here's a breadboard photo:


« Last Edit: June 28, 2020, 06:15:15 AM by Arangonix »

antonis

Re: ToneBender MK II level pot
« Reply #1 on: June 28, 2020, 11:23:14 AM »
While waiting for breadbord photo..  :icon_lol:

2nd Level pot lug (wiper) should go to OUT..!!
(to whatever effect is destinated for hooking on..)
"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..

Arangonix

Re: ToneBender MK II level pot
« Reply #2 on: June 28, 2020, 11:44:08 AM »
Hey, thanks for reply!
You mean effect output? I'll try it immediately.

antonis

Re: ToneBender MK II level pot
« Reply #3 on: June 28, 2020, 12:00:41 PM »
You mean effect output? I'll try it immediately.

Yes, plz do it.. :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..

Arangonix

Re: ToneBender MK II level pot
« Reply #4 on: July 01, 2020, 12:49:11 PM »
Hey, could you check if I did it correctly? Yellow wires come from level pot, blue/brown from output jack.

« Last Edit: July 01, 2020, 12:53:25 PM by Arangonix »

dainenagle

Re: ToneBender MK II level pot
« Reply #5 on: October 24, 2020, 12:26:59 AM »
Very cool.

percyhornickel

Re: ToneBender MK II level pot
« Reply #6 on: March 18, 2021, 12:59:32 PM »
OK since I still have my tonebender in the breadboard too here you´ve got some tips:

- Replace the Q2c 33K resistor for a 100k trimmer, for Q3c just let the 8.2k right there.

- Start increasing from CCW to CW while measuring the Q3c until you read -7 to -8.5V (your taste). -> More than 8.3 starts gating too much in my build.

- Q2c should read -0.1V or 0.2V.

- Try to replace the Q1b 100k to 10K, like the TBMKII with OC75 (your taste). ->Very useful for leaky transistors

- Q1b must read the same or a littler higher voltage than Q3c.

That´s the way you set the bias.

Level pot:

Lug 1 - From 10n cap
Lug 2 - Output
Lug 3 - Ground (+9V)

P.H.
« Last Edit: March 18, 2021, 01:03:57 PM by percyhornickel »

percyhornickel

Re: ToneBender MK II level pot
« Reply #7 on: March 18, 2021, 01:05:21 PM »
OK since I still have my tonebender in the breadboard too here you´ve got some tips:

- Attack pot -> MAX (CW).

- Replace the Q2c 33K resistor for a 100k trimmer, for Q3c just let the 8.2k right there.

- Start increasing from CCW to CW while measuring the Q3c until you read -7 to -8.5V (your taste). -> More than 8.3 starts gating too much in my build.

- Q2c should read -0.1V or 0.2V.

- Try to replace the Q1b 100k to 10K, like the TBMKII with OC75 (your taste). ->Very useful for leaky transistors

- Q1b must read the same or a littler higher voltage than Q3c.

That´s the way you set the bias.

Level pot:

Lug 1 - From 10n cap
Lug 2 - Output
Lug 3 - Ground (+9V)

P.H.