choosing vtl5c1

[G-Sun]

Hi!

I need to get a couple of optos for my Forssell opto
Part: vtl5c1

Can I use these:
http://www.ebay.com/itm/1pcs-LCR-VTL5C-linear-optocoupler-DIP-4-New-/381443158837?hash=item58cfc8b335:g:zzAAAOSwI-BWJaZO
?

It says dip4, but seems to be suitable, or?

The other ones seems much more expensive.
But, there could be a reason for that?

 

[L´Andratté]

Hi Gsun, these don´t look like original vactrols. But at that price why not try if they work good anyway, could be,
VTL5C1 are around 20$ nowadays. There´s a thread by pucho on the topic from last month.

Also ungifted sells cheap clones at his wm-shop that were not too bad in response time and led current vs. resistance.

 

[G-Sun]

Hi Gsun, these don´t look like original vactrols. But at that price why not try if they work good anyway, could be,
VTL5C1 are around 20$ nowadays. There´s a thread by pucho on the topic from last month.

Also ungifted sells cheap clones at his wm-shop that were not too bad in response time and led current vs. resistance.

Thanks!

Didn't find that thread.

Yes, $20 seems like standard price.
Would like to buy something with expected decent quality.

diy-tubes: Clones? Like as good? Or just ok for the money?
Cheaper indeed.

 

[gyraf]

The "real" VTL5xx series are no longer produced - however, the chinese are making all sorts of "substitutions" available. Be prepared to go through a good handful if you need precise specs.

Jakob E.

 

[G-Sun]

The "real" VTL5xx series are no longer produced - however, the chinese are making all sorts of "substitutions" available. Be prepared to go through a good handful if you need precise specs.

oh..  thanks!
I don't know how thigh specs I need for two optoes.
Schemo says something about selecting resistor to match the opto,
but I'm no expert. I'll ask hitchhiker about it.

 

[benb]

Now I see (did I see this schematic in another thread? Looks familiar, but I didn't trace our what it does until now), it's a single channel of compression - one opto controls the actual signal level, and the other is for the meter movement. I don't know how accurate that really needs to be, it's just the meter showing how much gain reduction is being applied. These optos don't need to be Really And Truly Matched like they would be in a stereo compressor. It seems a couple dB off wouldn't hurt anything.

 

[G-Sun]

Now I see (did I see this schematic in another thread? Looks familiar, but I didn't trace our what it does until now), it's a single channel of compression - one opto controls the actual signal level, and the other is for the meter movement. I don't know how accurate that really needs to be, it's just the meter showing how much gain reduction is being applied. These optos don't need to be Really And Truly Matched like they would be in a stereo compressor. It seems a couple dB off wouldn't hurt anything.

Yes, seems so. Thanks!
I don't need to worry to much about matching.

 

[G-Sun]

Went with 2 of these:
https://www.banzaimusic.com/Vactec-VTL5C1.html

Hope they will be fine

 

[L´Andratté]

Those look good, handle with care  ;D