New Effect: Payback

Auke Haarsma · December 23, 2007, 04:13:10 PM

I've made a soundclip of the quality I get when I have it on the breadboard. Can anyone confirm this is the actual soundquality?

You can hear the clip here:
http://profile.ultimate-guitar.com/toomuchgear/music/

The 'clean' parts are a clean guitar looped via my DD20. The 'not-so-clean' parts are looped by the Payback.

Valoosj · December 23, 2007, 04:16:22 PM

Isn't your recording volume too high? I read something about it with the lo fi loop junky...

Auke Haarsma · December 23, 2007, 04:27:09 PM

I don't think so. I have this level of distortion with the rec level high and with the level low. The difference in volume in the clip is caused by me adjusting the playbacklevel-pot.

Auke Haarsma · December 23, 2007, 04:36:36 PM

Well, I rechecked after your comment. It appears the playback level and the recording level interact. If I record with playback level at max and recording level at 'normal' I get a lot of clipping. If I lower the playback level while recording I get a cleaner sound.

However, it doesn't get much cleaner than the first sample of the clip. Then again, it's a lofi-looper.

And it doesn't loop btw, just one playback and then it stops.

Valoosj · December 23, 2007, 05:04:11 PM

then you must be doing something wrong

which is good, since then there is room for improvement.

Auke Haarsma · December 24, 2007, 02:54:48 AM

yeah, could very well be the case. I can trigger playback by touching ground anywhere with my hand. The logic seems very sensitive. I guess it works as designed when boxed.

Valoosj · December 25, 2007, 03:27:34 PM

Do you keep it grounded? If not that might be why it only plays back once

Valoosj · January 15, 2008, 05:04:04 PM

Ok, I had a go at making a pcb. Could somebody help me find any errors?

Just say which component is wrong, and how it should be, I still have the file in layout creator.

The Tone God · January 17, 2008, 12:02:22 AM

Just an update. I noticed that Digikey is not stocking any of the ISD1600Bs now. Trouble is brewing.

Andrew

Valoosj · January 17, 2008, 05:53:47 AM

Indeed. I received an email from them one week after I got my ICs in. But I think they can be found at other places.

Valoosj · January 18, 2008, 10:14:56 AM

Schematic has been checked by Auke Haarsma, I edited according to his instruction, I think this should be it now.

Valoosj · January 18, 2008, 02:15:43 PM

CRAP! Gate 10 of the ISD needs to get his 5V. I forgot this on the schematic. Errors keep popping up!
Any body else that spots something?

Valoosj · January 22, 2008, 01:43:12 PM

Last time (I hope). Now it should be correct.

Valoosj · February 20, 2008, 05:39:14 PM

I just finished soldering, something is wrong. I hook up the power to the pedal, the led goes on, and after 20 seconds it goes out. Pushing the record/play button doesn't change the status of the led.

Valoosj · March 31, 2008, 08:17:46 AM

Tonegod, are you still there? I sent you some PMs, with the layout and a vid of what is going wrong. Apparently it's a grounding problem of some kind, but I can't find out what went wrong. I did everything I normally do.

cloudscapes · February 17, 2009, 09:18:33 PM

appologies for the necro-bump. I've been having trouble with this build I've partially breadboarded. I'm doing v1.1.
http://www.geocities.com/thetonegod/payback_v11/payback_v11.html

I haven't done any of the opamp buffer parts. for now, I'm just doing the recording and looping logic. started with the recorder, and by grounding pin 2, I succeeded in making it record a short clip, and grounding pin 2 to play it back! with that part of the circuit working, I put it aside and did the 4093 logic. unfortunatelly when I hooked it up, it doesn't work anymore. the record led blinks rapidly for half a second (shorter duration and more rapidly than normal record blinkage) and the led around the 14093 stays on at all times when I have power hooked on.

I couldn't find a place in town that had 4093's so I got 14093's instead, which as far as I can tell are the same thing. is this a problem? you should consider me a total noob at logic switching with these types of components.

I noticed the tone god's post about mislabeled pins
http://www.diystompboxes.com/smfforum/index.php?topic=65575.0
but I'm really confused.

I've found datasheets for both the 4093 and 14093 and neither of them are the same pinouts, and as far as I can tell neither of them would "support" tone god's advice to switch pins 8 and 10, and 4 and 6. if I did either of these, it seems like the layout diagram would change "logic" in the v1.1 circuit.

http://ece-www.colorado.edu/~ecen4618/cd4093b.gif
http://pdf1.alldatasheet.com/datasheet-pdf/view/11974/ONSEMI/MC14093.html

what should I assume to be true? the pin number swap, or the little pictures representing each of the four triggers, regardless of the pinout?

The Tone God · February 18, 2009, 02:22:11 AM

The diagram symbols are correct. Its the pin numbers on the symbols that were messed up. So match the symbols to you datasheet and adjust from there.

Andrew

cloudscapes · February 18, 2009, 06:59:45 AM

alright, thanks!
I matched the symbols and it know works. thank you muchly!

Valoosj · February 18, 2009, 09:20:20 AM

Does your payback work? I spent about a year trying to get it to work, but it never fully did.

kierc · February 18, 2009, 09:22:59 AM

Where can I get this ISD? would love to build this

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New Effect: Payback