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Roland (ish) filter for 4U / LW format
MUFF WIGGLER Forum Index -> Music Tech DIY  
Author Roland (ish) filter for 4U / LW format
dksynth
Have the first prototype of these coming in, interest check time for the extras.

Pretty tight SMD build. Essentially a middle-years roland filter clone using 13700 instead of ba662/ir3109. SK30a buffers, film caps.

BP, 2 pole and 4 pole outputs. 4 pole is hardwired to the VCA which just uses the extra half of an LM13700. 2 inputs, VC over Q and an attenuverted frequency VC input.



the bad producer
Well nice, would surely be interested!
a100user
the bad producer wrote:
Well nice, would surely be interested!


Me too
mothertongue
Very interested in this!
J3RK
Nice! I don't have time to build one myself, but it looks very nice!

You might already have a preference, but I found that polypropylene caps worked the best on my DownLow filter which is almost identical minus the buffering scheme. May be of some use to you.

I'd love to hear it with those JFET buffers! I just used op amps on mine. It sounds good, but whenever I hear JFET buffered filters, they've got a bit more life and growl to them it seems.

w00t
dksynth
J3RK wrote:

You might already have a preference, but I found that polypropylene caps worked the best on my DownLow filter which is almost identical minus the buffering scheme. May be of some use to you.


I put the big footprints there to accommodate the familiar polystyrene caps, but they should accommodate the polypropylene ones too.... I'll have to see if I have any and try it out, thanks for the tip!

J3RK wrote:

I'd love to hear it with those JFET buffers! I just used op amps on mine. It sounds good, but whenever I hear JFET buffered filters, they've got a bit more life and growl to them it seems.



The biggest thing IMO is with opamps it seems to lock up easily with high resonance or high input level. (same thing). JFET buffers just kinda saturate, naturally compress and keep it from cutting out, or at least I think that's what is happening.
Prunesquallor
Interested!
J3RK
dksynth wrote:
J3RK wrote:

You might already have a preference, but I found that polypropylene caps worked the best on my DownLow filter which is almost identical minus the buffering scheme. May be of some use to you.


I put the big footprints there to accommodate the familiar polystyrene caps, but they should accommodate the polypropylene ones too.... I'll have to see if I have any and try it out, thanks for the tip!

J3RK wrote:

I'd love to hear it with those JFET buffers! I just used op amps on mine. It sounds good, but whenever I hear JFET buffered filters, they've got a bit more life and growl to them it seems.



The biggest thing IMO is with opamps it seems to lock up easily with high resonance or high input level. (same thing). JFET buffers just kinda saturate, naturally compress and keep it from cutting out, or at least I think that's what is happening.


Nice on the footprints. That's what I did as well.

For the resonance, I used a back to back zener diode method that Dr. SnE showed me a while back. That keeps it limited nicely, but it's definitely tame. (which is nice sometimes, or for use for sine oscillation, but I like some of the sounds I've heard from things like Roland filters, the Serge '73 filter, etc. that use JFETs. I've never tried to build one like that myself.

Nice project!
ashleym
Ooh, yes, I would be all over that.
flts
Interested!
J3RK
Actually, I think I might be interested in one. I really need to build up a new synth to play with, and this, a pair of the LW FM Ogres, and maybe a few of my own items, I think would do the trick nicely.
teleport
I'd be interested in building one of these.
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