how to wire this mod? (DOD analog delay)

Started by rpjones, June 14, 2010, 10:49:13 PM

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rpjones

I have a DOD FX96 analog delay, and I read this old thread suggesting a mod to clean up the delays:

http://www.diystompboxes.com/smfforum/index.php?topic=29827.0

So I gather we have a 10K trimmer, a 100k resistor, a 10uF cap, and possibly two 4k7 resistors if you want to make the pot less "twitchy". Could someone tell me how the components should be hooked together and where they should be "spliced" into the board?

much thanks

RPJ

zombiwoof

Do you have the older "tape reels" version of the pedal?.  The one with the fixed resistor for delay time?
I assume the mod you are doing replaces the fixed resistor to change the delay time, or is it something else?.
I have the later version, which has an internal trimpot instead of the fixed resistor, and I've found one thing out, using it with battery power doesn't get the best sound out of it, it sounds much better with an adaptor.  And another tip I've read about but haven't tried yet is to power it with 12 volts instead of the regular 9 volts, it's supposed to make the overall sound and the repeats much better.

Mine sounds great, as long as I use an adaptor to power it, but I'm going to try powering it with 12 volts as soon as I get a good 12 volt adaptor.  It appears that the original DOD adaptors supplied 10 volts, at least that is what it says on the bottom label of the pedals.

Al

rpjones

yes, I have the old tape reel version with no factory trimmer. I understand about cutting the trace to R51 so it can be replaced by the trimmer, and I understand about soldering the 100K resistor to the wiper of the trimmer and then to the pad for R51. My question is how to connect legs 1 and 3 of the trimmer to the capacitor and where those connections tie into the circuit board. The thread mentions the cathode of D4 and the anode of C23, which are connected by a resistor in the schematic.