Pro Audio Design Forum

OK, let's try the simple again and please do comment about this option. This is what Shure is using on some of their more reputable portable mixers, considered the industry standards. The arrangement is not new, as I saw it on the latest mixer Stellavox released in the '80s, all discrete. Same thing...

From what I've seen, selecting RC for 100Hz and 2Hz, all four values change.

The only way I imagine is using a dual IC with one filter on each. Then select one path or the other at V(in).

How do I connect a simple toggle switch on a SK to select one combo or the other (flat and 100Hz)?

The first option, with the basic follower, is more or less what I was thinking about:

http://www.electronics-tutorials.ws/fil ... ter_6.html

Add a switch in the path, where the resistor is, and two capacitors to choose.

The question is what resistor value to use. Chip would be NJM2068.

That's why I asked for the samples.

Hopefully I can make the 4305 limiter work, when the parts get here, so I should have something to compare it with.

I'd prefer to bypass the 2762 completely when the limiter is off, and I might do that.

-18dB/oct is too steep a cut for location recording.

-6dB is more effective, as it can cut some of the low frequencies and give you the option to cut more later on. if you want to.

I need to add a HP filter, which is very useful on location recording. The idea was to use a voltage follower to do that, but it seems to have some tricks, like what resistor you load it with at the input, or what chip to pick. My idea is to put a switch and select between two caps going to the IC. ...

Going back to limiters, JRC is sending me some NJM2762 samples to see if they are any good as limiters or just garbage.

If they are reasonable, they could work on a small preamp version I'm working on.

I'm not so convinced putting an LDR at the input it's the right move. That it's worth trying and listened to, that is certainly something to try. I'd like JP suggesting, if possible with some sample circuits, a limiter on the second stage. I'm curious about simpler ways to implement an optocoupler (...

Thanks for your comments and suggestions. Many products I have looked into in the past months seemed to have abandoned limiting the first stage, and put a limiter on the following one. Maybe it's there where the Silonex might work well. Unfortunately the only design I have seen, suggested by Silonex...