tone bender mkii build report

[jjoko]

Build Rating

3.00 star(s)

Hi.

Transistor (Peak DCA55)
Q1 (MP42B): hfe 70~75, leakage 150 µA
Q2 (MP20B): hfe 90~95, leakage 50 µA
Q3 (MP20B): hfe 110~115, leakage 200 µA

collector voltage (VCC: -9.3v)
Q1: -7.42v
Q2: -0.19v
Q3: -7.78v

I've just finished building a Tone Bender mkii pedal.

Using a trimpot to control the Q2 bias is a common technique in Tone Bender builds.
Exposing the Q3 bias externally is also helpful for tone control.
When it comes to germanium transistors, buying them in bulk from eBay is usually a better deal than buying small matched sets.

The MP20B is a great transistor for Tone Benders because you can find ones with an hfe of 100+ relatively easily.

Sorry about my English.
Google Translate helped me with writing this.
Thanks!

 

[Jiberjew]

Looks great! Where did you find that style of DC jack?? I'll search Tayda for sure! I like that you can remove it to MOD the PCB if needed. Although, it does stick out pretty far. Either way, pretty cool!

 

[jwin615]

Looks great! Where did you find that style of DC jack?? I'll search Tayda for sure! I like that you can remove it to MOD the PCB if needed. Although, it does stick out pretty far. Either way, pretty cool!

Outies

 

[jjoko]

Looks great! Where did you find that style of DC jack?? I'll search Tayda for sure! I like that you can remove it to MOD the PCB if needed. Although, it does stick out pretty far. Either way, pretty cool!

https://www.taydaelectronics.com/dc-power-jack-2-1mm-enclosed-frame-with-switch-external.html

I think you'll really like this.