The Tone God

Thanks for the warm welcome and no problem. :) I know you were not trying imply anything about each of our designs so its cool. I was pointing out that the rambinator did not give any control specifications for their project so your design might actually be easier to tweak to their needs then trying to hack the Payback but they can still use things like the addressing feature from the Payback with your control design. From what I remember Dean designed his looper a long while back when you could get the 1020 at Radio Hack. When they stopped carrying the 1020 people got concerned so Smallbear got some so people could still build the project. I think the upgrade to the 25xx series was smart move all around. I might still do a 1420 version though as it is real simple to do the control circuitry with the same design restrictions given. How the hell did that happen ? I mean I understand the fame I have with the local cops but not this. To be honest I haven't been an active member in the community for too long so I am kind of baffled at that. In any case thanks for the kind words. :) The ISD series can for some be hard to get. Also most of the simpler ICs are intended for driving speakers so the output interfacing can be difficult. Even more so since there is no schematic of the output section or how the power down function operates it. :::shakes fist at Winbond::: If you were to go that far you would be better off move up to one of the other ISD series that are better intended for microcontrollers. Then alot of the features you mention would be pretty easy to implement. Just to expand alittle more on that thought. The technology does have limitations, what they are is unknown, but the sample rate is connected to the internal clock set by the manufacture hence why the rate and cutoff is affected in the various length ICs. There is an external clock input that is intended for applications that need very accurate playback but you can only adjust it so far as the internal filters and other parts still rely on the internal clock. Enjoy everyone. Andrew

If look at the Payback at the site Jaicen linked to there is an explanation of how the addressing feature works in the ISD25xx ICs. You could control the address lines with some simple logic to select the different addresses. You can even use a shift register to spin through the addresses with a fast clock to give a pseudo random result. Jaicen's design might be better depending on your control needs. If you only need one playback per button push then you use the internal "pushbutton" mode of the ISD25xx. It makes the circuit very simple. Jaicen was referring to his design which came before the Payback. His design might be better for the OP's purposes though as the Payback was designed with the limitation of only two switches for playback and record controls. My last name is not Coleman. I don't want Mr. Coleman to get confused with me, well unless we are in a police line up together. ::) No, I am. Just dropping by for this one thread. That IC, the ISD1020, is for the looper offered at General Guitar Gadgets. That looper was designed a long time ago when the ISD1020 was around. It is no longer produced so Smallbear keeps a stock of them for those who want to build the looper at GGG. That looper is probably the first looper that was created in the effect DIY community. Andrew