Mach 1 Overdrive mods?

[Markus Kersius]

Correct.
The cap you circled red is the 10nf.

 

[Robert]

Correct.

Excellent, thank you!

It appears like the 12K resistor in the Lightspeed is 22K in the Southland.

BTW let me know if you want a PCB for this when they're available.

 

[Chuck D. Bones]

I can see the trace connecting one end of the BAT41's to Vref. Didn't Michael Fuller claim doing that in his Plimsoul patent? ?

 

[Robert]

I can see the trace connecting one end of the BAT41's to Vref. Didn't Michael Fuller claim doing that in his Plimsoul patent? ?

He also recently invented a new circuit that allows his positive ground "Ranger" pedal to be powered from a standard center negative 9V supply with no daisy-chain grounding issues.

Groundbreaking..... wait... wouldn't that actually be not ground breaking? I can't decide.

If only he had gooped it with hot glue like Martha Stewart with something to hide, we might not be having this conversation right now.....
(Markus knows exactly what I mean)

 

[Robert]

Correct.

What is this circled in the pic? Is that the top end of a resistor?

 

[music6000]

As PedalPCB noted above, Is that a hidden 4K7 resistor in the Pic above.

 

[music6000]

Confirm Hidden Resistor Value pictured above ^^^^^^^^^^^^^.

Can you confirm Continuity between matching Circles highlited? :

 

[Markus Kersius]

The "hidden" resistor is the 12k.
The one right next to the bat41's is a 22k... that might be the alternative for the one missing 4.7k!

 

[Markus Kersius]

Can you confirm Continuity between matching Circles highlited?
View attachment 6691

Almost, measuring gives me the following:

 

[Robert]

The "hidden" resistor is the 12k.
The one right next to the bat41's is a 22k... that might be the alternative for the one missing 4.7k!

That makes sense. Probably increasing the gain of the second stage to make up for the added hard clipping.

 

[Markus Kersius]

BTW let me know if you want a PCB for this when they're available.

That would be excellent!

 

[Robert]

One last measurement (if you don't mind)....

Can you confirm that the 22K is connected to pins 6 and 7 of the TL072?

Then I think we'll be good to.

 

[Markus Kersius]

 

[Dali]

One last measurement (if you don't mind)....

Can you confirm that the 22K is connected to pins 6 and 7 of the TL072?

Then I think we'll be good to.

I thought you didn't trace by photo...



I'm just trolling.

 

[Markus Kersius]

One last measurement (if you don't mind)....

Can you confirm that the 22K is connected to pins 6 and 7 of the TL072?

Then I think we'll be good to.

Yes!
That's correct ??

 

[Robert]

I thought you didn't trace by photo...



I'm just trolling.

Well, when they're good photos like that there's no harm. ?

Yes!
That's correct ??

Perfect, couldn't ask for a better pic than that.

 

[music6000]

View attachment 6696
View attachment 6697

Thanks @Markus Kersius, We really needed to see the Back of the Board!
All I can say now is looking forward to building it on a Quality PedalPCB Board!!!
Bring it On!!!

Cheers music6000

 

[Flying]

I’m assuming the silver mica cap is the 100pf in the feedback, but why use a silver mica cap?

 

[music6000]

They are regarded as being Smoother, Beefier than Ceramic.
Some say it's the Placebo effect, It cost more & has to be Better!

 

[Chuck D. Bones]

SM is more reliable & not microphonic. And they are prettier.