Re: EQN build thread
« Reply #400 on: May 13, 2011, 07:09:59 PM »
You've either done something wrong, or you've done something wrong then... cough.
http://www.lazpro.com
I reserve the right to not sell to idiots


bobschwenkler

Re: EQN build thread
« Reply #401 on: June 03, 2011, 03:10:08 AM »
Hey All, I just skimmed through the first couple pages and didn't see an answer, forgive me if it's been asked already: What's the cost for one of these units run in USD?
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com

jensenmann

Re: EQN build thread
« Reply #402 on: June 03, 2011, 07:36:46 AM »
Regarding hum: is your 1084 placed near the PSU? If so move it to the slot farest from the PSU. Try to shield the inductors with some brass (iron! not aluminium, not copper).
Jens
Quote from: PRR
The tubes of course don't care what frequency they distort

jandoste

Re: EQN build thread
« Reply #403 on: June 03, 2011, 06:16:43 PM »
Regarding hum: is your 1084 placed near the PSU? If so move it to the slot farest from the PSU. Try to shield the inductors with some brass (iron! not aluminium, not copper).

Hi Jensen,
Yep, it is near the PSU... Will try it.
Thanks,

bobschwenkler

Re: EQN build thread
« Reply #404 on: June 05, 2011, 09:13:13 PM »
Is there a schematic for this unit?
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com

Re: EQN build thread
« Reply #405 on: June 06, 2011, 08:46:00 AM »
There is.
http://www.lazpro.com
I reserve the right to not sell to idiots

bobschwenkler

Re: EQN build thread
« Reply #406 on: June 06, 2011, 11:51:00 AM »
Where can I find this schematic?
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com

Re: EQN build thread
« Reply #407 on: June 06, 2011, 12:33:16 PM »
Page 6
http://www.lazpro.com
I reserve the right to not sell to idiots

bobschwenkler

Re: EQN build thread
« Reply #408 on: June 06, 2011, 12:38:06 PM »
Thanks! As a suggestion to help out other newcomers like me it would probably be helpful to have it in a more visible spot, like the first page of this thread or the EQN website.
Complete 312 to M1 type preamps, and anything in between - hundreds sold - The Hybrid 312: www.schwenkleraudio.com/312

www.dubnarcotic.com
www.schwenkleraudio.com

dmp

Re: EQN build thread
« Reply #409 on: June 26, 2011, 09:49:03 PM »
So I've noticed both of my EQNs have a low frequency sputtering noise. With no signal, they both put out about -55 dB (into a +4db soundcard input). It sounds like wind on a microphone. Turning up the HPF stops it. Any ideas? Any else noticed this? I'm using them in a 51x rack.


canidoit

Re: EQN build thread
« Reply #410 on: July 24, 2011, 07:03:25 AM »
 :)
« Last Edit: July 24, 2011, 11:49:03 AM by canidoit »
iva dunit formerly known as canidoit

dmp

Re: EQN build thread
« Reply #411 on: July 24, 2011, 09:55:59 AM »
This is my understanding:
RV4 sets the level of the EQ. It's purpose is to match the signal level to unity.
So run a signal through the EQ in bypass and observe the level, then engage the EQ and match the level using the trimpot.

RV5 is adjusted to get symmetric clipping. If you cannot see the signal clipping on your scope, then your signal is not high enough. Since you are using a signal from a macbook pro it is not surprising that you cannot clip the EQN. You need a signal of several volts to get a Neve circuit to clip.

onlymeeee

Re: EQN build thread
« Reply #412 on: July 24, 2011, 10:55:14 AM »
Boost at around 1k or whatever with the eq .. that'll give you 18dB or whatever extra gain before the output stage


canidoit

Re: EQN build thread
« Reply #413 on: July 24, 2011, 11:08:34 AM »
This is my understanding:
RV4 sets the level of the EQ. It's purpose is to match the signal level to unity.
So run a signal through the EQ in bypass and observe the level, then engage the EQ and match the level using the trimpot.

RV5 is adjusted to get symmetric clipping. If you cannot see the signal clipping on your scope, then your signal is not high enough. Since you are using a signal from a macbook pro it is not surprising that you cannot clip the EQN. You need a signal of several volts to get a Neve circuit to clip.
Thanks DMP, I will try that on the RV4
« Last Edit: July 24, 2011, 11:50:02 AM by canidoit »
iva dunit formerly known as canidoit

Re: EQN build thread
« Reply #414 on: August 05, 2011, 02:26:08 PM »
Hi,

Could anyone share the part numbers they used for R27 & R32? I have mouser part no.s 66-GS3T012J (R27) & GS3-100-47R0JLF (R32) but thy seem far too big to fit neatly on the board?

Thanks,

Steve

Re: EQN build thread
« Reply #415 on: August 05, 2011, 03:35:03 PM »
They are 0.5" pitch... so anything with a smaller body than that will do you.
http://www.lazpro.com
I reserve the right to not sell to idiots

Re: EQN build thread
« Reply #416 on: August 06, 2011, 02:08:15 PM »
They are 0.5" pitch... so anything with a smaller body than that will do you.

Sorry, I'm pretty new to DIYing and lack knowledge (and confidence) when it comes to sourcing parts but I've found these, are they ok?

Thanks again,
 

71-CPF212R000FKE14
(http://uk.mouser.com/ProductDetail/Vishay/CPF212R000FKE14/?qs=nHuOPoDtCcQ0W7e%252bm%252bMk7g%3d%3d)

594-5083NW47R00J
(http://uk.mouser.com/ProductDetail/Vishay-BC-Components/PR02000204709JR500/?qs=sGAEpiMZZMu61qfTUdNhG%2f4r7Iw6CIkyujIHaiAeRPI%3d)

Re: EQN build thread
« Reply #417 on: August 06, 2011, 03:38:07 PM »
Both of those should do you, but if you're in the UK go to one of the UK distributors.
Farnell, RS and Rapid spring to mind.
http://www.lazpro.com
I reserve the right to not sell to idiots

Re: EQN build thread
« Reply #418 on: August 27, 2011, 02:07:57 PM »
Calibrating RV5?
I've been trying to follow the calibration guide on the 'journey' thread but I don't seem to be able to make RV5 have any impact on the shape of the sine wave how ever far I turn it cw or ccw. Currently the sine wave is slightly blunt at the bottom when sending 1khz at 0dbu and if I try to boost the gain as suggested on the other thread it ceases to look anything like a symmetrical sine wave.

Any suggestions/guidance anyone?

Thanks,

Steve

Re: EQN build thread
« Reply #419 on: August 28, 2011, 05:29:07 PM »
OK ignore that last post (oh you were anyway!):) I'm continuing to troubleshoot and hope I'm making progress. No doubt I'll be back with some really rudimentary questions.


 

Related Topics

  Subject / Started by Replies Last post
76 Replies
25302 Views
Last post November 03, 2010, 01:51:16 PM
by pH
64 Replies
9682 Views
Last post May 04, 2011, 12:44:32 PM
by peter purpose
11 Replies
4334 Views
Last post January 23, 2012, 08:48:55 AM
by peter purpose
9 Replies
3588 Views
Last post October 24, 2012, 01:26:04 AM
by haima