The layout is based on a quite diffucult-to-read schematic found at Mod Wiggler forum.
It may contain some errors and there are few question marks next to some of the pots and one of the caps, so some "trial and error" might be necessary to get this thing working as it should. Also, the "Filter" switch looks like a feedback switch for the LM386 IC and it appears to be a panel mounted push button switch but I guess a SPST toggle switch can be used as well.
Just finished this one, It's partly working.
ReplyDeleteI socketed c9 and 100n is the least glitcy value I tried so I'm keeping it in there for now.
I'm getting distorted repeats. Also the feedbacks work properly when playing lightly but completely cut off when I pick hard like an impedance type thing.
Delay and mix pots work backwards.
The pot values seem fine except the mix pot which when just barely turned, goes full wet and gets super noisy. I'll have to experiment tomorrow.
Built this up tonight and had a few thoughts :
ReplyDeleteAt first I had the exact same issues as Mike, the Mix control seemed really odd and the repeats would only work if I played quietly.
I’m wondering if it’s not actually a Mix control at all and is maybe the Glitch control? My reasoning is that when I removed that control, I added a more normal pt2399 blend (see the Pitch Pirate, it’s pins 14/16 and then Blend 2 on the output cap - use 25kb) and then I was able to use it as a normal delay.
I then added the original Mix control back on and it seems that when it is up full, the clean signal will play and then a blast of repeats but if I lower it, it becomes a lot more stable? Perhaps a Threshold control?
Anyway, still distorted but sounds quite cool. I’m going to do some further tweaking!
Also, put C9 on a switch. 100nf gives thick distorted repeats and 10nf gives a slightly more trebley/thinner/cleaner repeat (though quite shrill). Good fun though.
*also I put C9 on a switch (experimenting with the cap is a good idea!)
ReplyDeleteThe LM386 is absolutely blasting the PT2399 so may look into adding a gain control but I am a big fan of the grit and the shrill filtering (or lack there of!)
Last thing! I’m not hearing any change with the filter button, will do some poking around but may repurpose it :)
ReplyDeleteThanks for doing some tweaking!
DeleteAs for the Mix control, I think you are correct since there is no unit that I can see that has a "Mix" control. However, labels like "Data" and "Latency" is quite common.
Ome question: have you wired up the LED? It might affect the behaviour of the circuit since it isn't a normal bypass LED?
After watching this : https://youtu.be/LvO5D3IBmwk
ReplyDeleteI would say that the layout as is achieves this, the mix is the load control. The value may need changed and the signal is extremely distorted but it’s getting there!
Haha, that sounds SICK!
DeleteJust realised I had connected the Filter Switch 1 to the GND and not the input again, will check this later tonight :)
ReplyDeleteI noticed in the videos that the LED pulsed alongside the input? I tried adding the LED last night and grounding the other part but I'm wondering if I've maybe wired it incorrectly!
Going to do these changes tonight and perhaps add a modulation board and see what we get. I get the impression that the Kompakt Kassette is just this design except it's using an envelope follower (like the Shagpile) to control the delay time overall?
Will let you know what I find!
Yeah, the LED pulses along with the signal, that's why it may also affect the sound of the pedal.
DeleteHow close are you now? half way? Almost there? Done?
I wasn't getting any LED pulse and the filter loop just killed the signal for me so I took it out.
DeleteInstead, I connected pins 1 and 8 of the LM386 through a momentary to crank the gain a bit (I think Kompakt Kassette has this?) and it adds a nice texture to the repeats. Will definitely box this!
Sorry, LED is definitely working. Not hearing any notable audible differences but it's possible that it may be altering the Load control a little? Anyway, this mental thing is for sure getting boxed :)
ReplyDeleteAwesome! Good job on this! I'll update the layout tomorrow based on your findings. I'll add the gain boost switch (pin 1-pin 8). I'll also ditch the filter switch.
DeleteI wondering iabout C9. Worth having a new filter switch that toggles between 10nF and 100nF?
This would be cool, just remember “mix” and delay are back to front :) big fan of the alt mix knob too.
ReplyDeleteSo with these tweaks is it verified? I just plugged mine in after it sat for a while and it definitely needs some work. I followed the existing layout.
ReplyDeleteI'll upload an updated layout corresponding the changes by Ross, hopefully this evening. It is vacation here so my screen time is quite limited ATM...
DeleteIf you already built this it may require some hacks, esoecially when it comes to the switches...
I wouldn't say it's "verified", I think another trace would be necessary as there's not a lot to go on and there seems to be multiple different versions but it's definitely a lot more usable. I would put C9 on a switch but start with 10nf and see what you think. My switch goes between 10/100 as I also like how blasted the repeats can get.
DeleteNo, I wouldn't say it would be a straight clone...more a "Memory Loss/Kompakt Kassete-alike". A proper trace would be nessecary for a clone but I guess we did the best based on the information we have.
DeleteRoss, which pot values did you ended up with?
I used a 50KA for the mix but that's only because that's all I had on hand. Currently got a 50kb for the time but tempted to try a 100kb to see if it gives some crunchy repeats at the end like the echo dream. All other pots stock. Used 25kb for that optional mix control too (but this is obviously optional).
Delete50KA for the "mix" called "load" on a few other examples.
ReplyDeleteJust uploaded the updated layout. Had to shift some things around and add a row for the Gain switch and the 10nF/100nF Filter switch.
DeleteLet me know if you see any errors.
And once again, big a thanks for tinkering with this one!
Awesome! I'm hoping to finish my current thing tonight and will jump straight to this. I'll let you know how it works out.
ReplyDeleteJust finished and it's way better. The only real problem I'm having is with the "load" pot. I'm getting very little dry signal unless I turn it all the way up, then I'm getting dry, but no wet and I can't seem to find a happy medium.
ReplyDeleteAlso my delay pot is backwards unless it's supposed to give less time the higher you turn the pot.
Last thing is I counted eight jumps, not seven.
Otherwise, this is sounding quite a lot like the video and a huge improvement over the first layout. If I can solve the dry signal thing, it's definitely a keeper!
For the Load ctrl...you could try a different taper....linear or reverse log? Will swap the lug connections for the delay pot and correct the number of links later today.
DeleteI haven’t really messed with the taper of the pot but I added my own mix control detailed above and kind of mess with the both of them for some nice results. Makes it much easier to control whilst also giving you a bit of control over the loudness of the repeats (as well as the glitchiness).
DeleteYou could fully omit the load pot and just use this other mix control (see the Pitch Pirate, it’s pins 14/16 and then Blend 2 on the output cap - use 25kb) for more standard sounds but I like the idea of having the Load on there too for that cut out on more extreme settings.
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ReplyDeleteHello. I tested the circuit. It works mostly, but it feels different from the demo. https://youtu.be/UFhxxOhgcYA
ReplyDeleteI changed the filter SW. Currently I add a 100n cap with sw and connect it to 5pin of 386, but I abolished the 100n cap
After the 10n cap, connect to feedback3 or vol3 with sw. It feels like a demo?
I Took Ross' advice and added the mix control like on the pitch pirate. Now I'm able to control dry/wet outputs way better. I also turned filter into a pot and made the gain switch into a footswitch. This is a cool circuit, like others have pointed out, not exactly like the origin video, but it's similar. Very box worthy Imo.
ReplyDelete