Not sure but Brian is suggesting a possible effect loop mod here: https://www.madbeanpedals.com/forum/index.php?topic=19730.0 C20 is the 1uF cap bellow IC4 and C28 is the 1uF cap connecting to pin 7 of IC4.
120k resistor lead at 10C has to be brought to 4G as per the schematics, otherwise oscillator won't work. With that one it is verified. Nice sounding too.
Yeah, it is pretty cool. The c/v is a cool feature and you can dial nice sounds with all these controls. I have also built the 3205 chips version, which has a warmer and richer sound, and which i prefer, but in the end, it is a good emulation of the dmmm.
HELLO MY NAME IS DIEGO, BEFORE ANYTHING I WANT TO THANK YOU FOR YOUR GOOD WORK, I MADE SEVERAL COMPILATIONS WITH YOUR DESIGNS VERO WITH VERY GOOD RESULTS ... (I DO NOT SPEAK ENGLISH, I'M USING THE GOOGLE TRANSLATOR)
NOW I'M FIGHTING A LITTLE WITH THIS, I HAVE REVIEWED IT SEVERAL TIMES, I CHECKED BRIDGES ON THE TRACKS THE COMPONENTS AND NOTHING THE ONLY CHANGE THAT MAKES COMPONENTS IS TO USE 2N2 FOR THE CAP OF 2N7 BUT I DO NOT THINK IT ALTERS SO MUCH TO THE CIRCUIT ... AND ... CLEAN SOUND ... I HAVE LOOKED FOR THE DIAGRAM ON GOOGLE BUT I CAN'T FIND IT, IS IT POSSIBLE YOU HAVE IT TO HAND?
Hello fuzzhead, in the end when probing I discovered a bad solder ... thank you very much again, it sounds great !!! You do a very good job !!! Now I can go on and finish my sagan delay;)
are the smaller yellow 100nf caps supposed to be 100pf? They are on row 3 and row 21 next to other larger red 100nf caps. Slightly confused, just wanted to clear up before diving in.
The small yellow caps is 100nF multilayer cermaics. They are part of the the power filter section and cermaics is usually specified since the handle ripple current much better than film caps.
I ended up checking the schematic posted early in the thread. Was just my knee jerk (lazy) reaction to ask the question. Gonna try to finish this one up now. Thanks for all the layouts, love the blog!
I built this circuit I know it is verified but for some reason I am getting delay I have signal all pots seems to work but the delay pot. the green led works its on all the i know it has turn off. any had the same issue while building this pedal. please help. i have debugging this for 5 hours i dont seem to find the problem
How do I add an fx loop as in the DMM?
ReplyDeleteNot sure but Brian is suggesting a possible effect loop mod here:
Deletehttps://www.madbeanpedals.com/forum/index.php?topic=19730.0
C20 is the 1uF cap bellow IC4 and C28 is the 1uF cap connecting to pin 7 of IC4.
120k resistor lead at 10C has to be brought to 4G as per the schematics, otherwise oscillator won't work. With that one it is verified. Nice sounding too.
ReplyDeleteYes, well spotted. Will update it. And the 1M resistor across pin 1 and 3 will be a three row resistor av the the correction.
DeleteThanks for verifying this monster. Do you think it does a good job emulating a real DMM?
Yeah, it is pretty cool. The c/v is a cool feature and you can dial nice sounds with all these controls. I have also built the 3205 chips version, which has a warmer and richer sound, and which i prefer, but in the end, it is a good emulation of the dmmm.
ReplyDeleteHELLO MY NAME IS DIEGO, BEFORE ANYTHING I WANT TO THANK YOU FOR YOUR GOOD WORK, I MADE SEVERAL COMPILATIONS WITH YOUR DESIGNS VERO WITH VERY GOOD RESULTS ... (I DO NOT SPEAK ENGLISH, I'M USING THE GOOGLE TRANSLATOR)
ReplyDeleteNOW I'M FIGHTING A LITTLE WITH THIS, I HAVE REVIEWED IT SEVERAL TIMES, I CHECKED BRIDGES ON THE TRACKS THE COMPONENTS AND NOTHING THE ONLY CHANGE THAT MAKES COMPONENTS IS TO USE 2N2 FOR THE CAP OF 2N7 BUT I DO NOT THINK IT ALTERS SO MUCH TO THE CIRCUIT ... AND ... CLEAN SOUND ... I HAVE LOOKED FOR THE DIAGRAM ON GOOGLE BUT I CAN'T FIND IT, IS IT POSSIBLE YOU HAVE IT TO HAND?
ReplyDeleteHere is the schematic
Deletehttps://www.madbeanpedals.com/forum/index.php?topic=21001.15
MUCHAS GRACIAS !!!
ReplyDeleteHello fuzzhead, in the end when probing I discovered a bad solder ... thank you very much again, it sounds great !!! You do a very good job !!! Now I can go on and finish my sagan delay;)
ReplyDeleteare the smaller yellow 100nf caps supposed to be 100pf? They are on row 3 and row 21 next to other larger red 100nf caps. Slightly confused, just wanted to clear up before diving in.
ReplyDeleteThe small yellow caps is 100nF multilayer cermaics. They are part of the the power filter section and cermaics is usually specified since the handle ripple current much better than film caps.
DeleteI ended up checking the schematic posted early in the thread. Was just my knee jerk (lazy) reaction to ask the question. Gonna try to finish this one up now. Thanks for all the layouts, love the blog!
DeleteGot it going tonight. Fired up on the first try. Used a tl072 because I don’t have any tl062 on hand. Great layout!
DeleteI built this circuit I know it is verified but for some reason I am getting delay I have signal all pots seems to work but the delay pot. the green led works its on all the i know it has turn off. any had the same issue while building this pedal. please help. i have debugging this for 5 hours i dont seem to find the problem
ReplyDeleteFinally got this built and it worked first time. For a PT2399 delay it is very very good.
ReplyDeleteThis looks awesome I don't think I could fit it in a regular box though....🤔
ReplyDeletegapco.co.uk
DeleteBest selection of enclosures and cheap if you buy in bulk
Think i used a type J
DeleteNice one thank you!
Delete