<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Thanks all, yes I see, nearly all the analogue stuff is on 0-9.<div class="">Perhaps it allowed better fidelity/dynamic range?</div><div class="">This is the half rack version, the pedal version just uses 0-5 and 0-9. However, this unit manages to get 2000 ms max sample/delay time (double the memory), whereas other units using the same system max out at 800 ms.</div><div class="">The A to D is a 4066/FET/comparator. The D to A is a resistor array/op amp/4066, pretty much like all the others.</div><div class=""><br class=""><div><blockquote type="cite" class=""><div style="font-family: Helvetica,Arial,sans-serif; font-size: 12px;" class=""><blockquote class="atmailquote"><br class=""><br class=""></blockquote></div>
</blockquote>Tom said </div><div>“"I once did something similar with a PIC. I wanted to process the PIC’s 0-5V output with an op-amp, and if you’ve got a standard op-amp on a 0-9V single supply, it clips at the lower rail. Raising the PICs voltage to 2-7V puts it in the middle of the range and avoids this problem.””</div></div><div><br class=""></div><div>I take it one wouldn’t use this type of A/D/A system today? I believe it was thought of as pretty cheap (those economical Roland engineers at it again?)</div><div><br class=""></div><div><br class=""></div><div>A</div></body></html>