comradehoser
Well-known member
This might be the pretty one!
Sorcerer/Wizard PTP
- Thread starter comradehoser
- Start date
comradehoser
Well-known member
Bottom layers in.
I was going to let the circuit dictate where the pots go, just ended up in the traditional 3-knob triangle.
Things I have learned so far:
Unlike resistors and capacitor legs that have remarkable plasticity, transistors really really don't like to have their legs bent back and forth. RIP 3 overpriced Interfet through-hole J201s. I will attempt a repair right at the body, but it ain't looking promising
Don't leave the mini sledge you use to marker punch close to the edge of the bench or it will snag on your shorts and crush your toe.
Be really, really careful with anything involving force once you start installing your fragile little circuits. I installed the first half of the circuit and was working on the bridge to the second tying into the gain pot. Was trying to muscle a pot leg out of the way and my big needle nose pliers slipped and smashed into the circuit. Broke a jfet leg in a complicated part of the assembly where a bunch of things tie in. Desoldering and resoldering is going to be a pain. Le sigh.
I was going to let the circuit dictate where the pots go, just ended up in the traditional 3-knob triangle.
Things I have learned so far:
Unlike resistors and capacitor legs that have remarkable plasticity, transistors really really don't like to have their legs bent back and forth. RIP 3 overpriced Interfet through-hole J201s. I will attempt a repair right at the body, but it ain't looking promising
Don't leave the mini sledge you use to marker punch close to the edge of the bench or it will snag on your shorts and crush your toe.
Be really, really careful with anything involving force once you start installing your fragile little circuits. I installed the first half of the circuit and was working on the bridge to the second tying into the gain pot. Was trying to muscle a pot leg out of the way and my big needle nose pliers slipped and smashed into the circuit. Broke a jfet leg in a complicated part of the assembly where a bunch of things tie in. Desoldering and resoldering is going to be a pain. Le sigh.
Mentaltossflycoon
Well-known member
Woe is your toe
Feral Feline
Well-known member
You know, though... Let it Flow!
comradehoser
Well-known member
Oh, I let it flow, but it ain't working.
Got bypass, no signal.
Please, pedal gods, let me have read the j201 pin outs correctly.
Gonna have to burn me some incense in front of the dmm and anoint my audio probe.
Also, yes my toe looks like a purple Vienna sausage.
Got bypass, no signal.
Please, pedal gods, let me have read the j201 pin outs correctly.
Gonna have to burn me some incense in front of the dmm and anoint my audio probe.
Also, yes my toe looks like a purple Vienna sausage.
Feral Feline
Well-known member
Problems or not, this is truly inspiring.
I need to build more, period, but I need to try some more PtP.
I'd help you trouble-shoot, but...
Can't tell one 47nJ from the other without the RefDes...
I need to build more, period, but I need to try some more PtP.
I'd help you trouble-shoot, but...
Can't tell one 47nJ from the other without the RefDes...
Feral Feline
Well-known member
"RefDes"... I say I say that was a joke son.
Joke fell flatter than a crepe pancake run over by steam-roller.
RefDes on a point-to-point build, what's the point? A joke, it was, I tell you, son.
So, going to audio-probe it? What's the action-plan for trouble shooting this?
(Asking for a friend who's going to attempt something similar)
Joke fell flatter than a crepe pancake run over by steam-roller.
RefDes on a point-to-point build, what's the point? A joke, it was, I tell you, son.
So, going to audio-probe it? What's the action-plan for trouble shooting this?
(Asking for a friend who's going to attempt something similar)
comradehoser
Well-known member
Well, I tried to repair the jfet at Q2. It's the first jfet in the middle going up. Packed the little stub with flux and verrrrry carefully aligned everything and just gave it some solder.
Stayed together, no working pedal, just some staticky frottements. I checked continuity to ground, continuity to vref and vcc, and continuity around the transistors and the socket everything looked good. I banged on the enclosure a bit to see if anything could shake the signal loose. This time I had a tiny bit of signal with all pots open. But, q2 broke loose again.
So I decided to bite the bullet and figured it just could be the smashed q2 causing the circuit to limp, so I decided to sacrifice another one of my Gucci j201s to the Sabbath tone.
Desoldered the old one with a minimum of collapses (PtoPers feel my pain), bent and fit things to make the new one match, keeping in mind what I learned not to stress the body juncture of the jfet legs and know I had to do it in a gentle minimum of bends and light light solder touches and......
....I have a churning raucous Sabbath/doom machine (!!!). Great pedal!
I guess the pedal gods verily heeded the incense and anointing of the holy troubleshooting apparatus.
Here is the pinup soft focus final incarnation. New q2 is the mustache looking one right above the socket. Less pretty than when I first laid it out, but I am so grateful it works! And it's my prettiest pedal to date (which ain't saying much but still...). I might audition some higher and lower hfe npn germanium transistors at q1--2 of the 3 I ordered have hfe in the 400s--but for now i am happy to let this little buddy rest.
Stayed together, no working pedal, just some staticky frottements. I checked continuity to ground, continuity to vref and vcc, and continuity around the transistors and the socket everything looked good. I banged on the enclosure a bit to see if anything could shake the signal loose. This time I had a tiny bit of signal with all pots open. But, q2 broke loose again.
So I decided to bite the bullet and figured it just could be the smashed q2 causing the circuit to limp, so I decided to sacrifice another one of my Gucci j201s to the Sabbath tone.
Desoldered the old one with a minimum of collapses (PtoPers feel my pain), bent and fit things to make the new one match, keeping in mind what I learned not to stress the body juncture of the jfet legs and know I had to do it in a gentle minimum of bends and light light solder touches and......
....I have a churning raucous Sabbath/doom machine (!!!). Great pedal!
I guess the pedal gods verily heeded the incense and anointing of the holy troubleshooting apparatus.
Here is the pinup soft focus final incarnation. New q2 is the mustache looking one right above the socket. Less pretty than when I first laid it out, but I am so grateful it works! And it's my prettiest pedal to date (which ain't saying much but still...). I might audition some higher and lower hfe npn germanium transistors at q1--2 of the 3 I ordered have hfe in the 400s--but for now i am happy to let this little buddy rest.
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Mentaltossflycoon
Well-known member
Feral Feline
Well-known member
Wroit Arm Mang!
"FROTTEMENTS"
I'm stealing that, "Frottement", for naming one of my own builds.
Congrats! Job well done.
comradehoser
Well-known member
Yup it's sorted!
I actually prefer PtoP for the creative/aesthetic/ problem solving aspect, and the direct interaction with components. Like if it's a good connection, it's a good connection. Also a different set of assembly, soldering and spatial building skills ( flux is key!). And it is very doable for simpler circuits.
I encourage everybody to try at least one.
Next up: flanger. Juuuust kidding. It will be the scarab/dung beetle. There is a dude that did a crazy PtoP clock or something. It was huge and nuts. I will try to find
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comradehoser
Well-known member
Boss level/Ultimate level boss (more here: https://www.eevblog.com/forum/beginners/has-anyone-ever-seen-this-construction-teknique-before/25/ ):
I'm just trying to get to something like this:
The PtoP out there just makes me looks like I am coloring with crayons in my fist.
I'm just trying to get to something like this:
The PtoP out there just makes me looks like I am coloring with crayons in my fist.
comradehoser
Well-known member
comradehoser
Well-known member
GizzWizzKing
Well-known member
Just breadboarded a distortion+ last night and thought
"I could maybe do this PtP..."
Clearly I was hallucinating.
"I could maybe do this PtP..."
Clearly I was hallucinating.
comradehoser
Well-known member
YOU CAN DO IT!!!
Which distortion?[edit: Distortion+, got it. Was reading without glasses]
Funnily enough, I just don't click with breadboarding at all. I actually did my first PtoP because I tried following BuddytheReow's two sticks of Derm tutorial and got impatient/couldn't hack it.
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comradehoser
Well-known member
Just took a gander at the schematic. Very doable for a first PtoP for sure. I think you should give it a shot.
GizzWizzKing
Well-known member
It does seem pretty simple to take a swing at. I have an Emexar board courtesy of @derevaun that I want to mod up but maybe as an initial pass..
Do you have a plan of attack you go by? It looks stressful compared to populating a PCB.
comradehoser
Well-known member
This guy's stuff is so clean it's filthy
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