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Question on an aion fx schematic about some labels and what they mean.

https://aionfx.com/app/files/docs/radian_documentation.pdf

It's for a rangemaster. VA, -VA and pwr_gnd.

I've googled it and VA came up with "A volt-ampere (VA) is a measurement of power in a direct current (DC) electrical circuit." I'm not sure how to translate that to english or eagle lol.

And power ground doesn't really return anything useful. Maybe ya'll would have some better answers for a newb?

Jay

Everything works but the gain knob. Volume adjusts the volume, tone adjusts the tone, the gain pot does nothing.
Anyone have any ideas as to why?

Name of the circuit = TS8 (oh) 8
https://rullywow.com/wp-content/uploads/2022/07/TS8oh8-v2.pdf

No modifications to the circuit and no parts substitutions.

Q1
C = 8.43
B = 3.54
E =3.14

Q2
C= 8.43
B= 3.54
E= 3.14

IC1
1= 4.20
2= 4.20
3= 4.20
4= 0
5= 4.20
6= 4.22
7=4.20
8= 8.43

Are there any differences sound wise between these two or is the pcb just updated?


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I've been working on a big muff from diyguitarpedals.com.au and am not getting any sound. I've audio probed it and am getting sound to C12 to the base of Q4 but not c13. I've replaced c13 and have the same issue. I've reflowed solder as well around that whole section to no avail.
I don't get sound to any other pin than the base of Q4. Should I be getting sound to either of those pins?



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Hey guys/gals,

Been pondering this all afternoon. Went home for a quick lunch. Decided I hadn't tried my QoB since I got my test box working and found that it works.
Sort of.

Only works with both foot switches engaged.
Any thoughts off the top of anyone's head why that would be? I didn't get a chance to do much in the way of troubleshooting. But thought if someone had a quick thought of where to start on that one it would be appreciated.




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I'd like to sub a TL072 for a 4558. Don't have any 4558 on hand. The pinouts look compatible. One question I do have is that in the build docs it shows what Voltage I should expect at each pin for the 4558. Would the voltage be similar for the TL072? Or completely different?


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Can anyone help shed some light on this?
I've not been able to get a 9v readout on anything.

What I have tried:
Multimeter setting


Four different sets of leads
1 set with a brand new multimeter I ordered just in case mine was bad. (Same readings for both)

Measuring at the DC Jack:
Get around 4v at the pins.
Different jacks. Some tayda and some lumburg that I just ordered from lovemyswitches.com

A bunch of different power supplies.


Is there something I'm missing?
I get nearly nothing to any board that I have wired up including one I verified working prior to all this madness.



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Anyone know what urls are available for this? I'd like to as a personal project rebuild it in a Vue application. I probably won't host it. And if I did it would be with permission. But mostly just to get back into Vue applications (I program in react for anyone who knows what I'm talking about :-) )



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Possibly silly question.
Do you need to have the potentiometers soldered in to test a pedal?

Part of me thinks yes, because not having them leaves a gap in the circuit.

Part of me says no, it just will play as if all the controls are maxed out.

School me please!


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I got a a new amp. Didn't check the rating.  It's a 16ohm 4 watt head. And an 8 ohm cab rated for 30w. Will this damage anything?


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I'd like to split the input signal from the guitar with this http://tagboardeffects.blogspot.com/2014/08/amz-2-channel-splitter.html?m=1

How do I put them back together? I've seen mixer layouts, but what if I just want to combine the signals without mixing? Is there an easy way to do this? I don't want pots for the mixer I've seen.
http://tagboardeffects.blogspot.com/2013/01/2-channel-mixer.html?m=0




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Built a metal oxide fuzz (diy guitar pedals Australia ) last night. Has an unintended octave. Common reasons that this might happen?


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I'm guessing no. Just confirming that's the case.




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I was gifted this lovely board. However the previous owner had no build doc for it. Anyone happen to have one/ know where I can find it? My google searches were unsuccessful. [emoji1787]


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Hello, hopefully this is the correct place for this! I'm currently learning this whole Eagle schematic and pcb creation workflow. Was hoping for some pointers if possible. I'll attach a pic of my schematic and layout so far. I just placed the parts, I have a feeling they could be better arranged, but I'll consider this my first draft. I'm definitely open to any constructive criticism.

For reference I have been using this guide (not related to pedals at all)

https://learn.sparkfun.com/tutorials/using-eagle-schematic
https://learn.sparkfun.com/tutorials/using-eagle-board-layout

This is the schematic I am practicing with:
http://www.diyguitarpedals.com.au/shop/boms/Classic_Boost_Schematic.pdf

I stopped at Routing the Board in the second link before I started routing things.

My initial questions are:
1. Can anyone point me to pedal specific tutorials in Eagle?
2. What can I best do to optimize my current PCB layout?


Thanks in advance Gents and Ladies

Jay

Hello all. My second project is an 8-ball. Having some issues. Rocking before boxing has been followed. The pedal won't pass a bypass signal. When turned on passes a nasty hum and some audio signal from the guitar. Being new. I'm sort of stuck.
Things that I have verified and checked:

Both guitar cables work when plugged directly into the amp.

I did find I had the one IC in backwards. No progress.

Values at the pins are added as an image below.  Along with the voltage coming in at the board from the power supply.

Note: these are definitely off from the build guide values listed. Also included as an image for reference so you don't have to go searching for those values.

Also I am having the exact same problem with another build. (Swedish chainsaw) so maybe it's my test rig?







Test rig (led not hooked up)




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It says 1n 100n and 200n. Is this nf? Searched and couldn't come up with an answer.




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