Chorus.I need some help on building a stereo chorus!!!!!!!

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1/19/2000 11:41 PM
Padelis	Chorus.I need some help on building a stereo chorus!!!!!!! Hi there,     A few posts ago i found out that i could built a stereo chorus/flanger/delay unit using my MN3101 and MN3011.I tried to find some schematics from stereo chorus pedals but nothing.Now i am asking you to guide me to build a good sounding chorus/flanger unit.Any suggestions acceptable.   Thanx in advance.Padelis

 

1/20/2000 4:23 PM

Doc

Compared to booster pedals, fuzz pedals, and compressors, effects like chorus, flange, delay, and reverb are much more complicated. It's commendable that you have the ambition to build your own chorus, but it's probably too complicated unless you dont mind spending a great amount of time experimenting. You can buy a complete stereo chorus pedal that actually works (I bought one) from Musician's Friend for $20. (I don't know where you are located. That's in the US.) That's the current sale price. The normal price is only $30. At prices like these, it doesn't seem to be a practical use of good experimenting time building one from scratch. This is just the opinion of one guy, and opinions are like a**holes, everybody's got one.

 

1/20/2000 4:54 PM
Gus	I am with Doc. on this even at $30.00 you would have a hard time getting all the parts with shipping etc. Most chorus effects use the 3011? and 3007 chips anyway go price them at DIGIKEY.com.

 

1/20/2000 5:24 PM
AMZ	quote: "You can buy a complete stereo chorus pedal that actually works (I bought one) from Musician's Friend for $20."     I recently ordered one of these to try out and they are on backorder until February. How does yours sound, Doc?     -Jack

 

1/21/2000 7:06 PM

Doc

Jack:     I ordered one of the EQ pedals, but that was BO'd. So I figured I'll try the stereo chorus and compressor pedals. The cases are plastic, along the lines of an Arion pedal, a little larger than Boss. Bottom plate is thick steel, completely rubberized outside. Circuit boards & interconnecting wiring is top notch. Nothing cheesy. Battery cover is on top, across the middle. Power jack takes 5.5mm plug, tip negative (as Boss).     The chorus works pretty good. It seems like it's set for a middle of the road range, not as lush as Boss or others, but I found that it was usable in the range I would want for enhancement of an acoustic guitar.     The compressor actually works. I've built the Whisper, and the Rogue doesn't have the range of compression & attack settings. It can't be considered for studio work as a serious tool. But it has the same chip as the MXR, plus many additional transistors & passive components to achieve quiet switching. When used as a sustainer, it seems to excel. I used it to sustain single notes. The AVC can keep a constant level during string vibration decay, without generating a lot of noise like the revered MXR. It works great for slide.     The only cheesy thing on these pedals is the jacks. (They had to cut the cost *somewhere*) The jacks are very light duty plastic things, just like on a guitar tuner.     I'm still waiting for the EQ pedal.     These things are perfect for indoor use, kind of light duty due to the jacks and maybe the plastic case. But the electronic construction is solid. What the hell did they pay the factory for these babies??     You could buy the compressor pedal for 20, even 30 dollars, put it in another enclosure with good jacks, and have a roadworth pedal.     Doc

 

1/22/2000 2:30 PM

AMZ

Doc:     Thanks for the report! I also ordered the EQ and have not received it yet either.     >> What the hell did they pay the factory for these babies??     Hmmm, list price is $30 so the wholesale would be $15. That means that the importer probably pays $5 each from the factory (plus freight), but obviously the importer is offering a discount from the $15 wholesale to move some pedals and stimulate interest.     regards, Jack

 

1/22/2000 4:57 PM

Mark Hammer

Well, I'm the one who is guilty of getting you started on this, so I had better get you out of it!!     If you have acquired the technical notes on the MN3011, you will see that it contains an electronic reverb schematic virtually identical to the one from ETI that I received recently (thanks Preben).     Basically, the only critical thing missing from that application is an LFO circuit to vary the clock rate. For this you can consult almost any MN3007/3207-based chorus/flanger that runs off a similar supply voltage. I'll poke around and see if I can find/recommend one. The lowpass filtering in the existing schematic should be sufficient, since you would be increasing the clock rate for a chorus/flanger application, rather than decreasing it. The timing cap for the 3101 would also need to be reduced by about 60% to get you in the right delay range. Alternatively, you can use the existing clock rate/range/cap and simply use different taps, depending on the delay range you want.     I'm hoping to get an MN3011 for myself (found them for $12.50 at Dalbani) and experiment, so I'll let you know if I have any empirically-based findings to report.     For Doc, Gus, and Jack, I will point out that the stereo tapping possibilities of the 3011 make for a VERY interesting pedal design that should not be underestimated.

 

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