bluebird

Opamp Labs equalizer.
« on: June 23, 2004, 06:04:11 AM »
Does anyone have a schematic for an opamp labs eq circuit? Someone had it on the old forum. I think it uses a 325 EQ.


Opamp Labs equalizer.
« Reply #1 on: June 23, 2004, 06:14:12 AM »
Just give them a call and ask for their catalog. They have the schematic of a Model 109 EQ using the 325EQ opamp in it. (323) 934-3566 They're in Hollywood, so it shouldn't take to long to get the catalog.

It's funny you should mention Opamp Labs, I am going there later on today to pick up some inductors. http://www.opamplabs.com/87.htm

Cheers,

elco

NewYorkDave

Opamp Labs equalizer.
« Reply #2 on: June 23, 2004, 08:53:40 AM »
Model 109 Equalizer

325 EQ amplifier application

As always, thanks for PRR for the webspace.

Hey Elco, while you're there, could you ask for a datasheet for the (discontinued) model 325L limiter? I recently acquired a small batch of these, and have no data on them at all--not even pinouts. I wrote to Bel about it, but haven't received a response.

Opamp Labs equalizer.
« Reply #3 on: June 23, 2004, 09:09:11 AM »
Quote from: "NewYorkDave"
Hey Elco, while you're there, could you ask for a datasheet for the (discontinued) model 325L limiter? I recently acquired a small batch of these, and have no data on them at all--not even pinouts. I wrote to Bel about it, but haven't received a response.


Thats a 10-4 good buddy. :thumb:

bluebird

Opamp Labs equalizer.
« Reply #4 on: June 23, 2004, 03:30:47 PM »
Thank you Dave....and of course thank you PRR for the space!!!!

Bryson

Opamp Labs equalizer.
« Reply #5 on: June 23, 2004, 04:43:14 PM »
Here's some more Opamp EQ Schematics - Two, and Three band:


http://home.mindspring.com/~redbugg/OpampEQ2.jpg

http://home.mindspring.com/~redbugg/OpAmpEQ3.jpg


Download 'em soon if you want, as I probably  won't leave 'em up for long.

bluebird

Opamp Labs equalizer.
« Reply #6 on: June 23, 2004, 07:41:23 PM »
I can get tons of the 325EQ's for between $10 and $20 depending on quantity if anyone is interested.

neilium

Opamp Labs equalizer.
« Reply #7 on: June 23, 2004, 08:04:24 PM »
I'd take 2 at $20. 4 at $10.

-n
BODY MASSAGE!!! http://media.ebaumsworld.com/gijoebodymassage.mov (>1 meg download)

adrianh

Opamp Labs equalizer.
« Reply #8 on: June 23, 2004, 10:11:11 PM »
Dave;
Thanks for that when I saw the 109 EQ I lost it.

Bluebird I assume the 325EQ is a plugin module
like everything op-amp makes!
Cool do you have a datasheet on the 325EQ module only.

Bryson

Opamp Labs equalizer.
« Reply #9 on: June 23, 2004, 10:15:14 PM »
I've got a 16 ch Opamp Console that I was thinking of parting out.  Maybe sell some "channel strip" kits, with a 360 mic amp/xfrmr, a 325 EQ amp with 2 band LCR assembly.  No o/p xfrmrs though, as there're only four, which on the o/p busses. These would also include gain switch, the eq pots/switches, knobs, and the octal op amp sockets. I'd pull 'em out trying to keep most of the wiring intact. There'll be about a dozen available. I guess I'll have to think of a price now................hmmmmmm.


Bryson

Opamp Labs equalizer.
« Reply #10 on: June 23, 2004, 10:23:17 PM »
Quote from: "NewYorkDave"


Hey Elco, while you're there, could you ask for a datasheet for the (discontinued) model 325L limiter?


http://www.opamplabs.com/325l.htm

PRR

Opamp Labs equalizer.
« Reply #11 on: June 24, 2004, 12:21:03 AM »
> datasheet for the (discontinued) model 325L limiter?

Can you crack one open? I've always wondered what was inside those cans. What VCA technique? They are old enough not to use any of the usual-suspect chips. So low-voltage and compact that a tube is highly unlikely. The specs don't look right for Opto, yet opto would explain why no external timing controls (there are plenty of N/C pins available).

NewYorkDave

Opamp Labs equalizer.
« Reply #12 on: June 24, 2004, 10:12:18 AM »
Bryson,

Thanks for the link to the datasheet. It's not linked on OpAmp's main page, so I didn't know it was there.

Personally, I think it's a shame to part out unusual old consoles, but hey--it's your choice. Here's a schematic for the 12-channel version of that console:
http://music-club.rutgers.edu/headfonz/NYDave/opamplabs-1204TV.jpg

How about trying to sell it intact before resigning to part it out?

PRR,

I only have seven of the 325L, so I'm reluctant to sacrifice one to science. I'm pretty sure OpAmp modules--at least the small signal models--are potted. But perhaps Bel from OpAmp would be willing to divulge some info about what's inside, since it appears to be a discontinued product.


 

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