For anyone interested in weird and wonderful circuits, I have the schematics for the Joemeek VCQ1 - micpre / processor.
It features the "meequalizer" and a photo-electric compressor.
Let me know you're interested and I'll send it over.
Mats
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I'd be very interested to see that also.. ferreira@gabrielsousa
I'd be very interested to see that also..
Me too!!!! mark@markblasco.com
Me too!!!!
Oops....sorry, forgot the address... tvendt@attbi.com It's too e
Oops....sorry, forgot the address...
tvendt@attbi.com
It's too early on a Monday
TP
could I have one too, please? Cheers, Giles blowbackmusic@yahoo.
could I have one too, please?
Cheers, Giles
blowbackmusic@yahoo.co.uk
Me too, please Mats! I have their little PC front end but that
Me too, please Mats!
I have their little PC front end but that only has an SSM 2017 as front end. The opto-compressor contains an LDR that looks a lot like the cheapest one in the Maplin catalog...but these things do look alike!
Thanks in advance!
Please, please, please johnd@ronrose.com
Please, please, please
Hey Mats! What's the op-amp in the mic pre? Haven't seen that
Hey Mats!
What's the op-amp in the mic pre? Haven't seen that kind of topology before; is that a linear gain pot and if so, does it have a good 'feel'?
About the opto-compressor element...do you know what make it is? Is it two separate devices (like in my cheap little one; two orange LED's shining on an LDR), or is it a manufactured device? A company called Silonex make these types of devices manufactured for audio use, but I have yet to come across a manufacturer that uses them...thoughts, anyone? And whilst on that subject...what opto-devices do focusrite use in their platinum range?
Silonex Inc.
Bjorn
Bjorn, On the subject of optos, there are some fairly extensive
Bjorn,
On the subject of optos, there are some fairly extensive prior threads. A lot of manufacturers use the Vactrol brand. You can get then from Newark in the US and there is a European partner....guys?
Overview:
http://optoelectronics.perkinelmer.com/producttemplates/Category.asp?levelId=14370&s=2&ss=1
PDF with lots of good info/applications:
http://pki1.mondosearch.com/cgi-bin/MsmGo.exe?grab_id=68845178&EXTRA_ARG=&CFGNAME=MssFind%2Ecfg&host_id=5&page_id=387&query=vactrol
Gerry
hi could i have a copy of these schem's too! thanks soundxmiser
hi could i have a copy of these schem's too! thanks
Originally posted by Bjorn Zetterlund: What's the op-amp in the
Originally posted by Bjorn Zetterlund:
What's the op-amp in the mic pre? Haven't seen that kind of topology before; is that a linear gain pot and if so, does it have a good 'feel'?
The mic pre is made up from two opamps, the first as a non-inverting, the other as an inverting amp. For a linear dB law, a non-inverting opamp needs a reverse log pot whereas an inverting one needs a regular log pot.
Using a linear gain pot in this configuration balances things very nicely. The dB gain vs pot position curve is slightly "S" shaped but you really can't tell. It feels very right to me.
The cool thing is that the 1:st stage does most of the work during the first half of the pot range, and in the second half, the 2:nd opamp kicks in.
I have not used the JoeMeek myself but I have built several preamps using this configuration. I first saw it some 22 years ago in an article in "Studio Sound" by Steve Dove. If you read Glen Ballou's book on recording technology you'll find the article in revised form there.
No idea about the compressor bit - sorry!
Mats
Sorry for posting this late but i just found out about this foru
Sorry for posting this late but i just found out about this forum.
Could you please send me the schematics too ?
Infernal_Death@gmx.de
Thank you very much !!
dear mats, if you (or someone else) would be so kind to send thi
dear mats,
if you (or someone else) would be so kind to send this schem to my direction too, i'd be quite thankful ;D
bless,
madMixx
coming to think of it, this is actually my 1st post on this forum, but i've been lurking here for weeks to learn stuff. you guys and this forum are absolutely amazing! *thumbs up*
Is that the VC1Q or the VC1Qcs (current sense) I have the secon
Is that the VC1Q or the VC1Qcs (current sense)
I have the second and would like a schematic.
.... but I am most interested in the schematic for the VC1Q with the TX input. I had a few emails with Ted Fletcher and he said they dropped the TX in favour of the current sense input as it was lower noise ... and I'm sure there was another reason ???
Still it would be interesting to see the before and after schematics.