#BEST DIY ENVELOPE FILTER MOD#
#BEST DIY ENVELOPE FILTER MODS#
#BEST DIY ENVELOPE FILTER SERIES#

TI chip in IC1 with a Fairchild in IC2 produces a filter sweep, but the sound is also distorted a bit. TI chip in IC2 does not work - the sound is simply cut at the beginning of the sweep. I ended up ordering both Fairchild and Philips (NXP) chips, so I figured I might as well compare all the different combinations of them. I failed to read the build reports before assembling the pedal, so I learned the hard way that TI chips won't work. I will report again, when I put it in a box and try it out in detail. Francisco, thanks a million, you really nailed this one. The experimentig here really is well rewarded by the results. This is a true DIY project! It has sooo much space for moding and tweaking and experimentig, fairly easy to build, fairly cheap parts and a good effect as a whole. When I finished it, you could barely tell it was working - there was no obvious sweeping, but with a little effort, it now quacks like a duck. I'm not yet sure if there's a volume drop with using the effect, as I haven't assembled my bypass switch yet, but if there is, I'll try to fix it by following advices from other DIY-ers who wrote their build reports (thanks in advance).

#BEST DIY ENVELOPE FILTER MOD#

I'm not going to do that as I can barely fit this version im my hammond 1590B box, but I would recommend everyone to try out that mod if they have space. The mod itself is very useful and it gives a lot of different sounds, so it would be nice to put a multiple-position switch and connect all the different capacitors to improve versatility of the device. I will try to change Ca1 and Ca2 to 1nF as well to see wether it will suit me better. Turns out 560pF is too little for me, the sound just hissed and it was useless, so I changed C6 and C7 back to 1nF. As for filter range mod, It wouldn't work like I expected it to work.

#BEST DIY ENVELOPE FILTER SERIES#

I placed a resistor in series with pot temporarily, but in future I'll either change the R5 to a bigger value, or buy another pot. Since I have humbuckers, the treshold level has to be maxed out so I could get some sweep. When I fixed it, it finally worked, but not quite as I expected it to work. When I first turned it on, it wouldn't work, because I had errors on my PCB (I etched it myself), as usual.

I'm not going to put it in a box yet, however, as I plan to experiment a little before I close the deal. I've been building this thing for a while now, and now, when I'm finally done, I'm fairly satisfied with the result.

I switched them to Motorola, and it started to function as it should. The Problem was that the Texas Instruments (TI) 4069UBE chips DO NOT WORK in this pedal. thank you very much again francisco, and best regards from bombay!ĭid not work at first.

#BEST DIY ENVELOPE FILTER MODS#

i like all the mods though, and would recommend them to anyone who isn't afraid of a bit of wiring hassles. If there is one mod that MUST be done, it's the reverse sweep switch. this pedal OWNS on guitar or bass! i love the degree to which i can control and tweak the sound with the mods too. built it with all 3 mods - reverse sweep, range and emphasis. I have also make the filter range mod but it doesn't give any strong change of sound. If You want some mode to do, make the emphasis control and reverse sweep. I had to connect 10M +10M+2M to get the value of 22M ohm. I used the original ICs CD4066 and CD4069 and it works as it should. I finished building MXR EF about 2 weeks ago, and I have to say that it is very great sounding pedal. Great sound! This should be fun playing some Grateful Dead on!!!

I have all 3 TI chips in there now with the clock voltage down to 1.62v and it works like a charm! I got both the Fairchild and the TI chips to work. I adjusted R16 (The ground side of the clock voltage divider) using a 100k trimpot. Tried it with Fairchild and it still didn't work. I built this with TI chips and it didn't work. Other thing that i cannot find out is why when I turn it on, i feel like the volume decrease a little bit, so I have to turn up the volume in the amp, and it's not cool to go check your amp everytime you turn on the stompbox, so please if you got the same problem and you solve it please let me know. I have done this proyect after 2 months, becasue y bougth another CD4069 instead CD4066, so i decided to leave the proyect, but when i figured out the problem about the CD4069 I run to the shop to buy the original CD4066 so check it out, I guess I'm not the only fool that make that mistake. Tonepad - build reports for MXR Envelope Filter Name:

Best diy envelope filter