Pro Audio Design Forum

On pure sustained tones at 100 Hz I can hear various degrees of distortion at almost every setting of the capacitance multiplier when QPS is switched out and don't hear any change in timbre at any setting when QPS is in. HD-3 is near the same residual level as the VCA's HD-2 with QPS. At 50 Hz HD-3 ...

I just started doing listening tests late yesterday and so far I really like the variable capacitance multiplier. I need to put on the 'phones and do some critical listening but before I do I wanted to verify, with tone, the benefits of Quadrature Power Summing. A quick FFT with a 100 Hz tone shows ...

Doug what does NLC bring to the table for you that you don't get with RMS? Less distortion on low frequencies? I did some digging to find out how dBx and THAT settled on the typical 10 µF, 7.5 µA, 35 ms log-domain tau, 120 dB/s decay rate used in almost every app note and schematic since the beginni...

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Are you looking for someone to design this for you?
Motor drive is not something we typically discuss here.

Ahhh, so the boing is not a problem of the spring being a bad delay line, just the opposite---it's still too "good" of a delay line, given that there are only 2-3 of them. That makes so much more sense. It's not that spring reverb goes boing because springs go boing, it's that springs go ...

I'll add that over time I find I'm using non-linear mode the most with Pico's in pop music, acoustic Americana, etc. I rarely ever use adjustable attack/release, it's NL or RMS. Never the peak mode. I think the waveulator is a better approach for transients. I agree. Using an "RMS" compre...

Thanks for joining us 555x555. You might want to read through this thread: https://www.proaudiodesignforum.com/forum/php/viewtopic.php?t=213 Preemphasis with spring reverbs is often used to emulate constant-current drive to maintain an equal driving current vs. frequency into the highly-inductive lo...

Thread from the past. I'll add to the dataset that 7.6V is the end-of-life voltage for a Zircon water leak detector. It reached end of life around 12:30 AM this morning and began beeping. I have about eight in the house - two in the kitchen. This one was behind a snap-on kick panel underneath the si...

10 uH is large enough to require a core, unless you like big air core coils; did you ever measure a noticeable increase in distortion when you guys used them? Are you referring to saturation from DC currents or signal? Joe had an AP and ran lots of tests on the circuit before he started using them ...

I did a quick video of the variable capacitance multiplier both without and with Quadrature Summation. Without the quadrature component ripple in the 50 Hz toneburst response can be seen with effective capacitance ranging from 2.2 to 22 uF for a log-domain tau of about 7.6 to 76 ms. When the quadrat...