anyone used these as indicator led?

[oskar]

That's good enough. Now try it with gain, volume, EQ full on up to se if the LED is interfering. And to see if the sound has changed from before with the possible leakage!

[oskar]

Also. See if it is in off or on state when you plug a cable into the input ( switch it on ). Try this a couple of times.

[grolschie]

hmmm.... I can still hear it on the loudest notes.

When on battery, the pedal always starts off in the off position when inserting the cable.

Thanks for your help. Maybe I am best to borrow another TS-7 to A|B them?

[grolschie]

Argh. My friend is away, so I cannot borrow one presently. What voltage should both transistors be? Both on 7v?

[oskar]

Did you experience any noise?

What voltage should both transistors be? Both on 7v?

No. They should actually hold about the voltages they did...     
There was so many things there I didn't bother to calculate. I thought the reason the components were different was for the startup position (which it is) and that the levels after power up would be comparabel (which they're not)
I ran a simulation of it... for the switching action the main issue seems to be the trannies sinking properly to 0V which they both are modded and not, in simulation and for real. TR11 ended up 7.5V and TR12 some 6.5V...
First thing you need to know about electronic components is that the tolerances are high. Especially with transistors.
We're well within safety limits so nothing should get damaged and that is my main concern... second is switch stability and noise.

hmmm.... I can still hear it on the loudest notes.

But did you hear any change compared to before?

When on battery, the pedal always starts off in the off position when inserting the cable.

Thanks for your help. Maybe I am best to borrow another TS-7 to A|B them?

Good starting point. Actually knowing what the thing is supposed to do is really no. 1,2 and 3... And I can't help you with this.


-There is something beautiful about putting in all this effort into a little thing blinking. Blinkenlicht. I kind of like it.

[grolschie]

Did you experience any noise?

No noise that I could hear. I didn't crank my amp loud though, but no noise like on the video, so far.

No. They should actually hold about the voltages they did...     
There was so many things there I didn't bother to calculate. I thought the reason the components were different was for the startup position (which it is) and that the levels after power up would be comparabel (which they're not)
I ran a simulation of it... for the switching action the main issue seems to be the trannies sinking properly to 0V which they both are modded and not, in simulation and for real. TR11 ended up 7.5V and TR12 some 6.5V...

So they are about right then? So the sounds I am hearing should not be from the switching then?

First thing you need to know about electronic components is that the tolerances are high. Especially with transistors.
We're well within safety limits so nothing should get damaged and that is my main concern... second is switch stability and noise.

Switch seems to work consistently.

But did you hear any change compared to before?

Without A|B'ing it's hard to tell. I can still hear it, but maybe not as much.

Good starting point. Actually knowing what the thing is supposed to do is really no. 1,2 and 3... And I can't help you with this.


  -There is something beautiful about putting in all this effort into a little thing blinking. Blinkenlicht. I kind of like it.

Thanks for your time and help. It's been more challenging than I would've thought getting the multi-colour lights working. The LED is sitting slightly high, so I ended up putting some heat shrink around the LED to stop the light escaping out the sides - to ensure LED colours mixing when viewing from angles other than directly downwards - cannot see the heatshrink from the outside - looks better than it did - although I could've resoldered and lowered the LED slightly.

[Sir H C]

Realize that pedal has a gain of around 2000 (I have to calculate it again...), I tried with regulator and decoupling caps but it was still there.  I think if I worked harder I could get that going right, but as it is I decided to go for a Red/Green LED for on off.

[oskar]

Realize that pedal has a gain of around 2000 (I have to calculate it again...)

    Ouch, that's a lot of gain.
How do you calculate gain in a circuit with diodes in the feedback path?

I tried with regulator and decoupling caps but it was still there.

But the one on your video... did you try exorcism?   

So they are about right then? So the sounds I am hearing should not be from the switching then?

Other highgain circuits have quirks like this. Like the Rat for instance...

What you could do is audioprobe it. Try and see if the fet's are closed when they should be.

Here is a software oscilloscope/analyzer. I haven't tried it yet but it's recommended elsewhere.
http://www.sillanumsoft.org/



Oskar

[Sir H C]

Realize that pedal has a gain of around 2000 (I have to calculate it again...)

    Ouch, that's a lot of gain.
How do you calculate gain in a circuit with diodes in the feedback path?

I tried with regulator and decoupling caps but it was still there.

But the one on your video... did you try exorcism?   

So they are about right then? So the sounds I am hearing should not be from the switching then?

Other highgain circuits have quirks like this. Like the Rat for instance...

What you could do is audioprobe it. Try and see if the fet's are closed when they should be.

Here is a software oscilloscope/analyzer. I haven't tried it yet but it's recommended elsewhere.
http://www.sillanumsoft.org/



Oskar

That fuzz actually doesn't have any diodes, but even with diodes, you assume that you are below threshold and are just looking for "small signal gain".  I was ready to have a separate regulator for the LED and one for the pedal, but thought that might be a bit overkill  

[grolschie]

Ok, so I did some tidying up on the board. I ended up with:

• R72 = 330k
• R88 = 25.5k (2x 51K) maybe this should be a 33k?
• R62 = 1k (unchanged since a few days ago)

I ran a simulation of it... for the switching action the main issue seems to be the trannies sinking properly to 0V which they both are modded and not, in simulation and for real. TR11 ended up 7.5V and TR12 some 6.5V...

Voltages when using battery:

• TR11: on = 0.04v, off = 5.65v
• TR12: on = 6:17v, off = 0.04v

Voltages when using PSU:

• TR11: on = 0.04, off = 7.38v
• TR12: on = 6.81, off = 0.03v

The voltages seems different with battery versus PSU. Does this all look ok please?

[oskar]

To me these voltages look like what you could expect. The switch seems to be working just fine in most senses so go audioprobe on the fets if you want to dig deeper in the mysterious "clean leak"

Check the voltage on your battery please... This could affect the sound. An aging battery can affect a circuit in many ways. The cell in itself has a voltage that depends on the technology/chemical process used but when it gets older the internal resistance will increase. When you load the battery the current outtake will eventually make the voltage decrease.        it sounds like what your experiencing...

When you experienced the interfering clean guitar, did you power it from a battery or a PSU or both?

[grolschie]

Hi Oskar.

Hmm... I suspect that the mystery is solved. Kinda. It would seem that my Bad Monkey (which has similarities) does this same thing, so it's probably not the TS-7 switching afterall?    I kinda thought I could hear it a little the other day when I A|B'ed, but I had thought that it was more noticeable on the TS-7. I didn't say anything at the time, because I wasn't certain. But after A|Bing again just now, it's really clear that both are doing it. So maybe a TS thing?

I am very sorry to have wasted your time Oskar. Thank you very much for your time and help in getting this multi-colour LED working properly. I would have probably given up and just stuck a blue LED if it wasn't for your help.  Thanks again!

[oskar]

Certainly not a waste of time... That's part of the fun! ( Actually the bigger part of it! )   
He, he... perhaps your friend is going to be annoyed by the whole thing after two weeks and beg you to make it stop?
I'm glad I could help...



Oskar

[grolschie]

Many thanks. 

perhaps your friend is going to be annoyed by the whole thing after two weeks and beg you to make it stop?

Hehehe.   

[newperson]

does anyone have a mouser part number for these LEDs? Or another US seller?