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Geoff's Amateurish Pedal Tinkering Workshop 
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Pendulous
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Post Geoff's Amateurish Pedal Tinkering Workshop
EDIT: This thread is now Geoff's pedal tinkering workshop.




I don't know if you feel like doing favours like this but I was wondering if you might go over a layout I did last night. It all checks out to me but you have a lot more experience in this.

Attached images of the layout and the schematic it's based on. The idea here is that half of the 4558 is doing the overdrive circuit while the other half (out of view) is doing a verified Orange Squeezer circuit. Note I cutaway the strip beneath C4, R7, R8.



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OD250GeoffH.png
OD250GeoffH.png [ 24.13 KiB | Viewed 15281 times ]

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Sun Mar 06, 2016 2:17 pm
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Winston Wolf
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Post Re: Hey experienced pedal tinkerer from this forum,
Without getting into detailed examinations(will sit down wif it later), i can see that the opamp is not complete because each pair of pins (1+8, 2+7, 3+6, 4+5) will share a common connection.

So for sure, you need some trace cuts under that bad larry. And you will probably want to move it a bit in from the edge there so you will have some room to work with for pins 1234.

I will look more that the rest when i get back from the grocery store.

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Sun Mar 06, 2016 2:27 pm
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Winston Wolf
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Post Re: Hey experienced pedal tinkerer from this forum,
Also, i am pretty much always up for this type of biz.

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Sun Mar 06, 2016 2:33 pm
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Pendulous
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Post Re: Hey experienced pedal tinkerer from this forum,
chris_d wrote:
Without getting into detailed examinations(will sit down wif it later), i can see that the opamp is not complete because each pair of pins (1+8, 2+7, 3+6, 4+5) will share a common connection.

So for sure, you need some trace cuts under that bad larry. And you will probably want to move it a bit in from the edge there so you will have some room to work with for pins 1234.

I will look more that the rest when i get back from the grocery store.


Oh my mistake, I forgot to include those cutouts on the image. They are cutout, so the pins are not shorted to each other.

To clarify, in the previous post depicted is only the right side of the circuit, for the overdrive. In reality the 4558 is in the middle of a longer board.

Here is a picture of the left side of the circuit, which features the cutouts you mentioned:


Attachments:
ORANGE_SQUEEZER_001.png
ORANGE_SQUEEZER_001.png [ 121.33 KiB | Viewed 15278 times ]

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Sun Mar 06, 2016 2:50 pm
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Winston Wolf
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Post Re: Hey experienced pedal tinkerer from this forum,
Ah, ok. Make sure that if you only do half at a time, that you will still need to ground pin 4 for the od half to function.

EDIT: nm, i see what you are saying now, you are literally using that other layout for the left half of the board.

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Sun Mar 06, 2016 2:56 pm
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Pendulous
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Post Re: Hey experienced pedal tinkerer from this forum,
Yup. I am using that layout for the comp, and since I want to use the other half of the opamp for the overdrive I had to devise my own layout for it.

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Sun Mar 06, 2016 3:07 pm
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Winston Wolf
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Post Re: Hey experienced pedal tinkerer from this forum,
Alright yo, now i have had a minute to czech it.

Looks mostly fine.

Coupla tings.

1. If you are strictly going by the schematic, that 100R should be inline BEFORE you send it into the opamp pin 8. This gets slightly wonky for the left side of your board though because both opamps in the dual have to share the +/- supply and the orange squeezer just has 9v coming straight in. I don't know how much voltage it is dropping here for the OD, but you could probably dump it entirely and just go as you have it to the opamp v+, excluding the resistor and its trace cut to R6. The 4558 sounds and clips differently than a 741 anyhow so you are already deviating a bit to begin with.

2. You are putting the electrolytics backwards in layout creator. That dark little bit on them is to signify the negative end. That said, the schematic shows a different orientation for the output cap (4.7uF) than i normally use anyhow. I usually point the negative end towards the output myself. To be honest i have never tried reversing it, that is just usually the way i have seen it. The other (10uF) cap is 100% correct in the schematic though, the negative end should go to ground.

Other than that, if you wanted to, you could totally compact this thing a pile. As it stands, combined with the orange squeezer half, you are looking at a pretty big board, and a likely tight/tootight fit even in a 1590BB.

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Sun Mar 06, 2016 5:06 pm
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Pendulous
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Post Re: Hey experienced pedal tinkerer from this forum,
Aha, hm, yes. Good catch on the 100R. I will fix that up real quick like... And the electrolytics. Man the way that french guy drew them confused me. I will orient them as per layouts of the OD 250...

BTW the OD 250 yellow version runs half a 4558 instead of a 741!

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Tue Mar 08, 2016 9:57 pm
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Winston Wolf
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Post Re: Hey experienced pedal tinkerer from this forum,
Unstrung wrote:
BTW the OD 250 yellow version runs half a 4558 instead of a 741!



Does that pedal use that 100R off the 9v?

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Tue Mar 08, 2016 10:06 pm
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Pendulous
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Post Re: Hey experienced pedal tinkerer from this forum,
Yup, as depicted in the french schematic

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Wed Mar 09, 2016 12:14 am
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Pendulous
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Post Re: Hey experienced pedal tinkerer from this forum,
I've started soldering this sucker and it will fit well enough in a 1590BB box. I'm waiting on thingies to come from Tayda Electronics so it can be fully assembled.

If it's a great success I will have to devise a way to make it look nice. I was thinking something involving a volcano and hula girls...

Also I've started an Ibanez Fat Cat clone, for my bass player.

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Tue Mar 15, 2016 5:17 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
So I have three projects ongoing. All my shites from Tayda arrived, I just need the time to assemble everything. In order of difficulty:


Tayda Electronics Lovepedal Purple Plexi 800 Clone


Image

This was an impulse buy I made during my lunch break. The pedal sells for like 200$ but it's more like 30$ in parts, and I've always wanted a stompbox that sounds like a Marshall so I just went for it. Their premade PCB makes this really simple. I still need to drill the enclosure (will probably use tools at work for all three of my projects in one fell swoop) but I did wire all the bits together all spaghetti-like this evening.

Whoa, this thing has loads of gain. You need to use interaction between the level and gain knobs to get a low gain sound, you can't clean boost and then bring in some dirt like a tubescreamer. I don't like it as much as I do my actual Marshall sound, it's a bit looser in the lows, but it's ballpark and will be fun to play around with.

Ibanez Fat Cat Clone

Image

My bass player wants it. I'm done the PCB, am in the process of spaghetti-ing the result with all the hardware.

Orange Squeeze / OD250 dual pedal

Image

This is the most difficult project. The two sides share the dual opamp. I intend to make the enclosure look super cool with a volcano/hula girl theme. The PCB is done and I have everything, but I feel like putting it in the enclosure before I test it because reasons.

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Sun May 01, 2016 9:42 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
Oh my god, trying to get one of these boxes shut fucking sucks :red:

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Wed May 04, 2016 10:58 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop


Woo! It seems I have succeeded. I had to flip the board over to get it closed, so the traces face you when you open the back plate. I wanted to have the components facing out when you open it so it's all like 'hello!' but that wasn't possible.

Image

Image

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Thu May 05, 2016 12:38 am
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Walrus meat
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
I enjoyed your video, Geoff.

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Sat May 07, 2016 7:41 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
:D

There's probably gonna be more.

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Sat May 07, 2016 9:06 pm
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Winston Wolf
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
Nice! I don't think i have ever heard of the Fat Cat. Whatsit based on/similar to? What is the amplifier innit? Transistor, IC?

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Tue May 10, 2016 7:35 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
I believe it is an adaptation of a Rat. But they use a 5534 opamp and there's a buffer to and the tone control isn't 'reverse'.

I am boxing up the Tayda Lovepedal clone now... aaand I drilled it all wrong. There is no way the jacks and the pots can coexist in the fashion that I intended them to. :mexican:

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Tue May 10, 2016 9:33 pm
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Winston Wolf
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
Ah yes, i have done that as well, in the early days of my experiments. That and the "shit, board doesn't fit inside the box because of the stupid place i put pots and/or jacks(including DC jack)"

These days i scrawl insane box layouts every damn time, to avoid fucking myself.

That, and i have gotten into the habit of just glueing a bit of cardstock cut to size inside the lid of the box, just so that none of my ill-fitting bits can short on the thing when i bolt it down. :red:

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Tue May 10, 2016 9:41 pm
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Pendulous
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Post Re: Geoff's Amateurish Pedal Tinkering Workshop
Image

Image

Lovepedal Purple Plexi 800 clone... Really pleased with the appearance. Not so much the sound. There are a couple things I have issue with... the tone knob doesn't do much, the drive knob does nothing until the end of the turn, at which point it introduces some feedback. It is super high gain and quite flubby in the lows. I think the gain must be a lot higher than its supposed to be.

chris_d wrote:
These days i scrawl insane box layouts every damn time, to avoid fucking myself.

I have an AutoCAD license at work so I actually draw the box out and arrange it, then print in 1:1 ratio so I can use it as a guide. Then I use work's centre punch to get the drilling off to a merry start. Work's drill presses. My job has really come in handy for this little hobby.

From what I've seen with this particular build I should also draw out the internals so I can make sure they won't all up in each other's grills.

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Sat May 14, 2016 5:05 pm
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