Channel Switching?

[ampdoc1]

It been years since I've opened up a boogie, but they used to use standard Vactrols. I'd bet they don't want to talk about it because they are not compliant, and Boogie sells a lot overseas.

I've been building and selling a 3 relay board for a year or so, mostly for D'Lite type clone amps. There is a small pop when activated, but really not audible when playing live, and I don't think anyone recording would be changing channels anyway.

a'doc

[drz400]

Vactrols are exempt as are tubes as are other opto isolators.

I hope you're right but where did you get that from?

The suppliers I use in the UK that list them are reporting them as non-compliant. Tubes are listed as compliant because of the exemption.

exempt....
8. Cadmium and its compounds in electrical contacts and cadmium plating except for applications banned under Directive 91/338/EEC amending Directive 76/769/EEC relating to restrictions on the marketing and use of certain dangerous substances and preparations.

this reads to me cds in switching?
Then there is this
http://optoelectronics.perkinelmer.com/ ... sh1105.pdf
http://circa.europa.eu/Public/irc/env/r ... T_1.0_&a=d
http://circa.europa.eu/Public/irc/env/d ... T_1.0_&a=d


At the worst case there are many request for exemption in audio switching so I dont think you would get in trouble if you plead your case that there is no replacement for instance
http://www.chromatechnic.com/pdfs%20for ... uplers.pdf

[drz400]

It been years since I've opened up a boogie, but they used to use standard Vactrols. I'd bet they don't want to talk about it because they are not compliant, and Boogie sells a lot overseas.

I've been building and selling a 3 relay board for a year or so, mostly for D'Lite type clone amps. There is a small pop when activated, but really not audible when playing live, and I don't think anyone recording would be changing channels anyway.

a'doc

You can do a 10ms mute to eliminate the pop but the best part to do this with is also non rohs

[ampdoc1]

drz,

What is the "secret"? I'd love to make this better for myself and my customers.

ampdoc1

[paulster]

exempt....
8. Cadmium and its compounds in electrical contacts and cadmium plating except for applications banned under Directive 91/338/EEC amending Directive 76/769/EEC relating to restrictions on the marketing and use of certain dangerous substances and preparations.

this reads to me cds in switching?
Then there is this
http://optoelectronics.perkinelmer.com/ ... sh1105.pdf
http://circa.europa.eu/Public/irc/env/r ... T_1.0_&a=d
http://circa.europa.eu/Public/irc/env/d ... T_1.0_&a=d


At the worst case there are many request for exemption in audio switching so I dont think you would get in trouble if you plead your case that there is no replacement for instance
http://www.chromatechnic.com/pdfs%20for ... uplers.pdf

Thanks for posting those. That looks promising. Guess it'll be no different to NiCDs, where there is no equivalent high current battery so they've been forced to tolerate them under RoHS.

I'll see if I can get a status update from RS as they'll people devote to RoHS compliance as it's such a big thing here.

[drz400]

drz,

What is the "secret"? I'd love to make this better for myself and my customers.

ampdoc1

No real secret you basically mute the signal at the phase inverter for 10ms just before the switch and releasing 10ms after. Boogie has a patent on one way LOL. This basic idea has been done in mixing boards for many years. You can see an implementation of this brute force done with a 4049 (I think) on an Egnater Roctron TLO50
http://www.schematicheaven.com/newamps/ ... 50_50w.pdf

[collinsamps]

If you have ever taken the time(time I'll never get back!) going through the 20 LDR's in a Boogie Triple Recto switching network you'll see it there also. IMHO when you get to 20 you need a redesign!