Search found 169 matches

by carlmart
Mon Mar 02, 2015 9:05 am
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Tesla is showing this limiter for their optocoupler, on their application notes.

I'm trying to get some samples for further tests.

They do not have a Western rep,, only sell direct, which is a problem.
by carlmart
Sat Feb 28, 2015 8:23 am
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Has anyone built this limiter, using Photonix (ex Silonex), using their 32SR3 optocoupler? http://media.digikey.com/pdf/Data%20Sheets/Photonic%20Detetectors%20Inc%20PDFs/Audio%20Limiting%20-%20NSL-32.pdf I'm not sure if those optocouplers are RoHS approved, are they? Some OC, like Vactrols seem not ...
by carlmart
Thu Feb 26, 2015 9:16 am
Forum: Pro Audio Design
Topic: Designing the pcb
Replies: 12
Views: 22177

Re: Designing the pcb

No, even if I am not too sure of the decision, we jumped to a split supply design. Sorry I didn't inform that when I opened the thread, but I'm glad you remember it. The split supply is more "conservative", IMHO, and I'm not sure it will serve well my original purposes for this box project...
by carlmart
Sun Feb 22, 2015 9:44 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Can you elaborate a bit more on the 1570 and INA163 trick? I mean the 1510 circuit also has two diodes linking RG to the inputs. Where can I find the Texar circuitry? I've also been told that a non-RoHS approved is not allowed to be sold in Europe for instance, so a Vactrol based preamp would not be...
by carlmart
Sun Feb 22, 2015 5:00 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Unfortunately I won't be able to use the limiter at the input, as it should, because the chip I'm using (THAT 1510) won't allow it. That or any chip like it. So I will be using one in the second stage. Many people, like Tascam, are doing that now. Electronic differential inputs won't allow a Vactrol...
by carlmart
Sun Feb 22, 2015 3:07 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Did the design with optocouplers I attached showed well? On mine Firefox it doesn't.

Here's a simpler design, but I'm afraid every design works with its specific optocoupler, right?
by carlmart
Sun Feb 22, 2015 2:29 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

Thanks for the update. I composed a drawing, comparing the circuits both manufacturers propose. I asked for help from support on both manufacturers. Let's see what they suggest. The idea is to protect the signal from clipping peaks, which might save a recording in unexpected circumstances. Apparentl...
by carlmart
Sun Feb 22, 2015 1:15 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Re: Limiters with optocouplers

The reason seemed to be that they were made with cadmio or lead, if I am not wrong. It was not a technical or quality reason.
by carlmart
Sun Feb 22, 2015 12:59 pm
Forum: Pro Audio Design
Topic: Limiters with optocouplers
Replies: 48
Views: 125121

Limiters with optocouplers

In the past limiters with Vactrols were the norm. But the politically correct present seems to have make them almost disappear. Actual VTL parts are hard to find, or every expensive (Farnell) or rather suspicious to buy (Ebay or other China suppliers). But I found these guys in Czechoslovakia that s...
by carlmart
Sun Feb 22, 2015 6:53 am
Forum: Pro Audio Design
Topic: Designing the pcb
Replies: 12
Views: 22177

Re: Designing the pcb

This is being my first in many areas. 1) I will be using two boards for the main design, and probably add some piggy backs, e.g.: for the limiter and headphone amp. 2) Unfortunately this is a TH version, which makes fighting for every millimeter a continuous, and sometimes losing, fight. 3) At the s...