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Hello!

I've recently finished my Leviathan delay from Etcher's Paradise. I etched a circuit board myself and it turned out good, but after soldering all parts the effect didn't work. I don't think there's anything wrong with the offboard wiring because the LED works like it should, the 3PDT wiring looks correct and the bypass works. When the effect is turned on the guitar signal goes through the pedal, but there's no delay applied. It's very hard to tell, but the signal might get a tiny bit amplified by the TL072 chip, so it seems like that one is working. It's of course really hard to tell when using a dynamic signal source though, so I'm not sure. I know it's impossible for you guys to troubleshoot it, but I just want you to tell me where I should start in the troubleshooting process.

Here's some information about modifications and stuff I've done to the circuit (please tell me if these could affect the circuit in any way):

• I've used a 510k resistor instead of 511k (R2)
• Many of the ceramic capacitors have been replaced with monolithic capacitors. For instance every 100pF.
• I've used chinese PT2399 chips (and TL072 for that matter.) so there's a risk that my chips just aren't working.

I'm guessing the 510k resistor shouldn't make any difference, but I don't know about the monolithic capacitors, so please tell me if there's any problems with using those. Is there a way to check if my chips are working or should I just buy some real ones and hope they work?

I also checked the DC voltages on the chips using my multimeter, so here's that information:


PT2399:

1: 5v
2: 2.39v
3: 0v
4: 0v
5: 2.86v
6: 2.39v
7: 0.57v
8: 0.60v
9: 2.39v
10: 2.39v
11: 2.39v
12: 2.39v
13: 2.39v
14: 2.39v
15: 2.39v
16: 2.39v


TL072:

1: 4.26v
2: 4.28v
3: 4.17v
4: 0v
5: 4.25v
6: 4.28v
7: 4.28v
8: 8.58v


It looks perfect to me, but please tell me if there's anything wrong with it or if I should measure something else.

If you want pictures or something I can post that too. Just let me know!

Hello! I want to etch something from Etcher's Paradise, but the black/white pictures used for the toner transfer are much bigger than they're supposed to be. If I print it with 100% size it covers almost the whole A4 paper. How do I fix this? The images seem to be 300dpi and my printer is 600 dpi, if that makes any difference. Note that they're big before printing as well.

I'm guessing just scaling it will solve it, but which size (or percentage) should I scale it to?

Hello! I'm looking for a compressor build that will give me that vintage, slightly distorted sound. One that really has character.

Which ones do you recommend?

Hello!

Let's say I for example need an 11k Ohm resistor in a project. I haven't got any 11k, only 10k and 1k.

How do you guys deal with this when using circuits designed by someone else? Editing the PCB layout would be really hard if you don't have the project file.
The only thing I can think of is putting two resistors (10k and 1k) in series on a really small board and then solder that board to the 11k resistor pads. I guess that would work, but it would look really bad.

Any other ideas?

Hello! I recently finished the Leviathan delay from Etcher's Paradise, but it didn't work. I'm now in the process of fault diagnosing and I realised that my LM78L05 voltage regulator doesn't reduce my voltage. I realised that the ground wasn't connected properly so I fixed that. Still didn't work though. I thought it was broken so I tried it with a new LM78L05 outside of the circuit (connected + from power supply to LM78L05 input and - from power supply to LM78L05 ground and then checked the voltage between ground and output and compared it to the voltage between ground and input). Still doesn't regulate it to 5v. It seems like both of them reduce the voltage by about 1 volt, but not more than that. Please help me!

I'm giving it 9v, 500mA but it measures ~8.87v. My multimeter doesn't want to measure the mA right now for some reason.

Edit: My multimeter measures ~8.16v after it has been regulated, but on the other regulator it was a little under 8v.

Hello! I'm building the Leviathan delay from Etcher's Paradise and right now I'm designing a waterslide decal for it. This delay is fully analog right? I want to write "Analog Delay" on it, but of course it has to be analog for that. I'm 99% sure it is, but I just want to make sure the PT2399 isn't digital or something.

Also, if anyone wants to give me an explanation on how to easily identify this in the future, I'd be really happy.

Thanks!

Hello! I'm currently building the Leviathan delay from Etcher's Paradise but I realised I don't have any 1uF film caps. How can I use electrolytic capacitors, which are of course polarized, instead? Which way should they face? In this schematic the 1uF caps are C6, C7, C17 and C20.

Also, will it make a noticable difference in sound for example?

Thanks!

Hello! I'm building the Leviathan delay from Etcher's Paradise on a perfboard for someone I know. Does this schematic have built in noise filter for the power supply? I've watched "DIY Guitar Pedals" video on youtube on how to reduce mains hum ( https://www.youtube.com/watch?v=julbbj4R3Ko ) and I was thinking it might be a good idea to add one to every pedal I make, but if it already has one it's of course unnecessary. I can't really tell the voltage bias and filter circuitry apart on this schematic. If I do add one, I should place it after the 1n5817 diode, right?

Thanks!

Hello! When building a pedal with a metal enclosure, can I just solder the negative lead of my 9v DC jack directly to the case? I've built a few pedals before, but only using plastic enclosures.

Hello! I want to try to build the Levithan delay from Etcher's Paradise on a perfboard (seems like a fun challenge), but I was wondering some stuff about the schematic ( http://www.madbeanpedals.com/EP/schematics/Leviathan.gif ). As you can see there's a bunch of "flags" with characters in them. For example under the LED in the lower right corner there's one with the letter "L". There's also two at the top with the letters "VB", two that say "+5V" and one that says "MOD". What am I supposed to do with these? I understand "IN" and "OUT". I'm guessing the "L" from the LED should be connected to the 3pdt switch after reading the Footswitch Wiring Essentials tutorial. Am I supposed to connect the "+5V" flags to each other? What do I do with the "VB" ones? And "MOD"?

Also, when you look at the PCB-thingy on the pdf-file there's connections for O, G and I too. Is that Output, Ground and Input?

Lastly, what am I supposed to do with the small "pin"-circles on the schematic? There's one under the LED for example.


I'm thankful for any replies. Sorry if this post was written badly, I didn't have much time.