Search results

It kinda depends on how the circuit is set up and what gain-reduction element it's using. You'll obviously have to disconnect the input signal from the sidechain, but also add a buffer to interface your key input. If there is a lot of gain, phase shift, or filtering before the sidechain splits...

Doesn't look great according to scam detector & whois, it's only been around for ~40 days.

In most cases, the Source & Drain pins of a JFET are interchangeable (i.e. it's a symmetric device). There are cases where that's not ideal, but I personally haven't run in to any of them. Better safe than sorry!

Yeah using a linear pot for Slew could defo be part of your uninteresting modulation. A log pot at 50% is the same as a lin pot at 15%, meaning a lot of the usable range is at the bottom of the control (I erroneously said top before). You'll have the most intense modulation & interesting sounds...

You'll probably still have to hold on to the IC until you've soldered one pin, but it's easier to hold in place. You can also use Kapton tape (or other non-marring tape) to hold it in place while you solder the first pin, which is easier with the bigger part. With larger SMD ICs, you can...

Looks awesome! Finding the right Rate, Slew & Gate settings for your own ideal modulation is a bit of an art. The modulation gets a bit less random & noticeable as you increase the Slew control (Slew smooths the transition between random steps). You may like it better starting at a low Slew...

Basically every MFG & distributor is out of the V3207D, as well as the MN3207 & BL3207. At this point, unless your willing to wait until Q1 2022, your best bet is to take a chance with eBay. If you're even moderately careful, you can get legit ICs from a ton of vendors. Even Cabintech sells...

Lookin' good! Love those Neve-style knobs, where did you find them?

Agreed, 258 & 358 are basically interchangeable. LM2904 has lower supply range, but should also do just fine in this circuit.

If there is no voltage on any pins of your JFET, then that's the more worrying problem. You may want to reflow the solder on the surrounding components after you check values as that can fix a cold joint or poor connection.

Are you sure the J201 is legit and has the right pinout? Based on the SMD pinout, the through hole pinout should be: J201s have DSG pinout vs. the SDG of 2SKxxx JFETs, but you would still expect to get voltage on the pins even if the transistor is inserted incorrectly. I'd check the voltage...

I'm also noticing the MF-101 uses 3x1k resistor arrays, I wonder how much difference that makes?

Yeah I've seen those arrays in quite a few transistor ladder schematic, I'd give them a go if I could find a reasonably priced equivalent. I'm leaning more towards the BCM847 NPN matched pairs as they're cheap (~$0.50ea) & easy to drop in to other differential pairs like VCAs & oscillators. Most...

Sounds good, I'll give it a try on the BB. I've seen a lot of synthesizers & modules that have options for overdriving a ladder filter, but not so much in pedals. I just recently found a schematic for the Moogerfooger MF-101 Lowpass Filter, which is a ladder filter pedal with a drive control...

Well that's good to know! Between 10 & 20Vp-p is the signal level for the Eurorack standard, which is what the Kassutronics Ladder Filter is designed around. I sim'd the original Eurorack layout with that 20Vp-p signal and and got ~400mVp-p (Input pot @ 50%) and ~900mVp-p (Input @ 99%) at the...

Nice! I was nervous to solder these at first, but it was actually super simple. The key is to secure the adapter board in place in a piece of blue tack and pre-cut 1-2mm lengths of solder to place near the pad. That way you can hold the tiny SMD part in place with tweezers and melt the solder...

Where did you study it, if you don't mind me asking? It's such a cool circuit, and I'm glad they've documented the history of it as it seems to have influenced a lot of other designs. Yeah I was surprised at how easily you could overdrive a standard diff amp, and how quickly it goes from "nice...

I'd 100% recommend the SMD adapter board route. There is much less risk of getting counterfeit parts (a big problem), and the Vp & Idss specs are much more consistent. I had 100 of these SMD adapter boards made at JLC PCB for less than $10. It has sides for DSG and SGD pinout, but none of my SMD...

Here's my Moog Ladder Filter with Hi-Z Guitar Preamp & Attack/Release Envelope Generator: The transistor ladder core is based on the Kassutronics Ladder Filter, and this filter sounds amazing! It's a 24dB voltage-controlled lowpass filter, so the frequency drops off much more steeply than...

The Level pot is directly linked (DC coupled) to the Treble/Bass pots & both switches, so there is a possibility that changing the overall resistance (i.e. scaling up R10/R19) of the voltage divider would change the behavior of those controls. If your pot is a 10K log pot, your best bet is to do...