Won't last long?
https://reverb.com/item/49881037-seppuku-mind-warp
Moderator: Ghost Hip
…...........................…psychic vampire. wrote:The important take away from this thread: Taoism and Ring Modulators go together?
Pepe wrote:Faulty PT2399 perhaps? These chips are a pain in the ass. I buy them from a shop that tests them before shipping, but still I have to throw away some of them, because they don't do the longer delay rates.
It made me mad when I tried to repair my Dynamic Echo Modulator two years ago: everything checked, resoldered, etc, but still no proper sound!?!?! Then lordgalvar suggested swapping the PT2399 AGAIN and then it worked. Crappy, cheap Chinese chips. But they sound great when they work.
lordgalvar wrote:Yea, had the same problem with a Mind Warp. Stopped working and switched the PT2399 which made it functional (like Pepe said). There are two different PT2399 lock up things (one during power up and one that has to do with analog/digital pin grounding). I think some of this is due to variances in chips and Rhys would just swap things until it worked. On the mindwarp the resistance at pin 6 is probably low which is why some chips only work...but don't know. Just guessing based on what I have read.
https://www.diystompboxes.com/smfforum/ ... c=112755.0
viewtopic.php?f=151&t=48812
Rhys's designs are very rudimentary and probably don't provide the right power at start up always (or there is a missing jumper between grounds). Worth a try? Maybe put a 1k trimpot between the LDR and Pin6 and adjust it until it has enough resistance at start up (it should anyway but I don't know if the light is coming LED is coming on and screwing with it? I've seen some chorus pedals use a latching transistor switch to change resistance on startup).
Always check soldering too. I always miss stuff on that because my eyes suck, haha.
I've gotten some bad opamps recently too.
Pepe wrote:It is also very important to try a few different LEDs. Some are too bright and some too dim so that the desired effect isn't achievable.
…...........................…psychic vampire. wrote:The important take away from this thread: Taoism and Ring Modulators go together?
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