INFANEM the driving notion clone

[eatyourguitar]

a solid maybe. those look really shit but they might work. I usually have a datasheet and a sample but maybe I am jaded. the surface finish on the stainless RAF hardware and the threaded M3 threads are flawless. very sturdy. it can support 100Lb's maybe 200Lb's. very nice.

[crochambeau]

a solid maybe. those look really shit but they might work. I usually have a datasheet and a sample but maybe I am jaded. the surface finish on the stainless RAF hardware and the threaded M3 threads are flawless. very sturdy. it can support 100Lb's maybe 200Lb's. very nice.

That's why I prefer to go to a shop and have a look at the hardware before I pull the trigger, I only included the aliexpress link as a visual aid. There are some truly high end objects in housing fixtures, and while they might be more than $5 a pop, you don't need to buy 50 of them.

[eatyourguitar]

thread pitch is usually much different. furniture would be #8-24 vs electronics #8-32 for example. ok with thread locker but I prefer to get the right stuff.

[crochambeau]

I prefer to get the right stuff.

okie dokie

[AZX309]

you got a drill templet my dude?

[eatyourguitar]

http://eatyourguitar.com/INFANEMdrill.pdf

[goroth]

you got a drill templet my dude?

HAWT

[eatyourguitar]

I wasted a box but I have another one ready to build or waste. roll the dice. that also means the drill template will not work unless you move everything down slightly. I also ran out of these jacks. other than that the build is going smoothly.

[BetterOffShred]

Has anyone completed a build of this in strip or from the pcb based off the trace yet? I built a shipboard Anders did and something isn't quite right. I checked it over with the schematic about 40 times and have found a few issues and corrected them, but it still doesn't sound right. Using an audio probe anything past the 7.5n (8.2n in mine) is sputtery and has shitty sounding decay. Anyway I was just curious if it was in fact verified for sure.

[ianmarks]

Sucks to hear the stripboard didn't work out, Shred. EYG, I know you are a bit of a perfectionist, but if the distance moved down isn't too much, you can just drill the holes bigger or if you have a step bit grind the bottom of the hole down to where it will work, Regardless, verifying before boxing will save you some hassle if debugging has to be done. I message AZX who appears to be attempting to boxing before verifying as well.

[BetterOffShred]

Yeah it works but something is amiss with the 2N5089's.

[eatyourguitar]

Sucks to hear the stripboard didn't work out, Shred. EYG, I know you are a bit of a perfectionist, but if the distance moved down isn't too much, you can just drill the holes bigger or if you have a step bit grind the bottom of the hole down to where it will work, Regardless, verifying before boxing will save you some hassle if debugging has to be done. I message AZX who appears to be attempting to boxing before verifying as well.

it needs to move 4mm down. I have another box. it doesn't cost me anything to do it again. if the PCB does not work then I will recycle the box for the next attempt.

Yeah it works but something is amiss with the 2N5089's.

can you be more specific? I would love to help you figure this out but that doesn't really tell me anything. does the signal pass through the stages with 2N5089? were the gains too low too high? too much treble? too much bass?

[BetterOffShred]

Well the post above I detailed it - everything works the high and low pots control the gain respectively as they should, the blend between the two sides works, the input signal pot works. The output (vol) works as well.

So now what is wrong:
The effect has a real weird sputtering throbbing decay that sounds shitty. So I used my audio probe and traced each side separately with all the transistors removed from the other, starting at the jfet. The jfet sounds fine and gives a good strong signal though I had to lower the 68k to the 50k trimmer to get it to bias where I wanted at 9V. So the whole bottom circuit (low) works and sounds fine all the way out to mix, and after the output buffer - all normal.

Then I did the high circuit in the same manner, and it sounds fine up to the 7.5n. After the 7.5n is where it grows the horrible throbbing sputtery decay. I tried numerous gains for both transistors there after the 7.5n with no luck.

UPDATE: while typing this out in my phone I decided to try a few things. The last 5089 is kind of set up like a Bazz Fuss like someone in DiYSB's pointed out so I bypassed that 100n between the base and collector diode, making it more like a Bazz Fuss.. (100k from 9v to collector, 1N34A from there to base) And now the decay problem is gone. It seems to behave like the videos a lot more now..

So yeah I'm up for more discussion on this but that seems to have been the ticket.. I'll listen to Darcy' s demo again with headphones and compare to my build.

[BetterOffShred]

Fooled around with it a little more, the sputtery decay is very much diminished now, but it still doesn't sound quite right. I'll keep trying. I measured all my caps and whatnot too, so I'm doubtful I have a faulty component.

[eatyourguitar]

first I want to thank you for the work you did in finding the problem. this helps me out a lot and it trickles down to help everyone who is having problems. second, I want to apologize to anyone who purchased a PCB. these mistakes can happen but I feel that it is my responsibility to warranty and provide some kind of remedy. today this remedy is documenting what might help solve the problem. in the long term, I will do more research based on the photos and the product sample to determine if there was a 47K resistor that was not included in the clone or alternatively if there was a resistor 4M7 that was accidentally marked 470K. I also think that 18v makes the perfect sound into a moving target. many things can go wrong if they are biased by a single resistor vs a resistor divider. it is possible to bias to V+ on only 9v or only 18v but not both simultaneously. the resistor divider increases something called stability. that is a technical term not a guitar player slang. the diode + cap from collector to base depends on a loud signal to decrease the impedance of the cap so that it biases the transistor. that can't happen if there is a problem on the previous stage. for now I can posit these 3 suggestions but it will take some time for me to build it and verify if these are random ideas or an actual working fix to the known problem.