Pro Audio Design Forum

That is a step up from the rectifier and log convertors I made with cheap 3086 transistor arrays. In the TS-1 dB meter I used to get an error near the top of the DB range (+20dBu) from the Rbb of the logging transistor. I bet those array devices have lower Rbb and less subsequent errors related to t...

I saw Rt but discounted it. 8.3 uA x 49.5k is down a few dB from typical 0VU (around 0.4V) discounting the parallel junctions.

Never mind...


JR

Wouldn't subtracting a reference 0VU current from the common emitters (Sym adj probe node) deliver a + and - voltage relative to 0VU threshold?

It may need an offset subtracted to account for two pairs in parallel.

JR

Thanks for the explanation, kind of like the step the old sweetening engineers performed.

JR

Deessing in a final stereo mix is kind of after the horse has already left the barn. Generally excessive sibilance is caused by too close miking hot instruments (like cymbals). Hot HF content quickly attenuates traveling through air to a less close mic. Of course that does not help after the fact. T...

any interest in a de-ess side chain filter? Or is that not as much of problem these days? Since this is a stereo compressor a simple de esser like a DBX900 would be inadequate for most audio program. It would need to be a much fancier side chain than a bandpass filter. Floating threshold, reacts to...

any interest in a de-ess side chain filter? Or is that not as much of problem these days?

JR

These are working into a 14K3Ω load. Wima now have some nice 5 mm lead spaced films in the MKS2 series that go up to 6.8µF so keeping them film is do-able. Cool... I was measuring phase shift at 20kHz from a 22uF caps ESL working into a 360 ohm R. 14K should not cause an issue even with modern elec...

Note: back when I spent too much time on my bench messing with phono preamps (1970s) I discovered a phase shift issue caused by a 22uF aluminum electrolytic capacitor's internal inductance (in a gain leg in series with 360 ohms). I expect modern electrolytic capacitors are much better but maybe keep...

Sounds like a handful....

JR