Purusha

Neumann W492 equalizer DIY project
« Reply #60 on: July 12, 2008, 09:25:40 AM »
Thanks for the info.

I will post my design today. Almost done  :thumb:
Regards as always, Purusha


Neumann W492 equalizer DIY project
« Reply #61 on: July 14, 2008, 04:01:03 AM »
Here is information about Neumann W492 knobs. As far as I know these are the order codes for the type used in the original equalizer. Codes are from Ritel catalogue, but is a good idea to check them from the distributor before ordering anything.

Knob 10mm, standard finish, with line, black, 4mm shaft
order code: 2110403

Cap 10mm, standard finish, with line, red
order code: 3010014

Cap 10mm, standard finish, with line, yellow
order code: 3010016

Cap 10mm, standard finish, with line, green
order code: 3010017

Cap 10mm, standard finish, with line, blue
order code: 3010015

www.ritel.ch


Marty: If you are planning groupbuy, Ritel has distributor in UK:

Bulgin Components PLC
Spilsby Road
Romford
Essex
RM3 8SB UK
Great Britain
 
Phone:    +44 (0)1708 343 800
Fax:    +44 (0)1708 376 544
e-mail:    [email protected]
web:    www.buglin.co.uk

Purusha

Neumann W492 equalizer DIY project
« Reply #62 on: July 14, 2008, 04:05:50 AM »
If anyone organizes this GB I am in for 4 sets  :wink:
Regards as always, Purusha

[silent:arts]

Neumann W492 equalizer DIY project
« Reply #63 on: July 14, 2008, 04:14:37 AM »
Quote from: "audiox"
Here is information about Neumann W492 knobs. As far as I know these are the order codes for the type used in the original equalizer. Codes are from Ritel catalogue, but is a good idea to check them from the distributor before ordering anything

all knobs I have on my (original) Neumann gear are from Elma ...
(but Ritel looks very similar on their homepage)

Neumann W492 equalizer DIY project
« Reply #64 on: July 14, 2008, 04:27:56 AM »
I have seen some (older) Neumann units with Elma knobs too. But W492 equalizers that I have seen had Ritel knobs. Also in W492 brochure there are Ritel knobs.

[silent:arts]

Neumann W492 equalizer DIY project
« Reply #65 on: July 14, 2008, 04:33:21 AM »
never mind, they look very similar.
take whatever is cheaper.
Elma is availabe in single orders from Farnell and Schuricht, but they are expensive there :roll:

Neumann W492 equalizer DIY project
« Reply #66 on: July 19, 2008, 11:03:54 AM »
12 units built & tested. All work fine! (Actually I have one more than I need so it is possible that i sell it.)

Some measurements (all filters off):
THD: 0,002% @ 1 kHz
Noise: -95 dBu (BW=20 kHz)
Frequency response: -0,1 dB (20 Hz - 20 kHz)

I will soon write some intructions how to adjust the 4 trimmer resistors.

Neumann W492 equalizer DIY project
« Reply #67 on: July 20, 2008, 02:21:41 AM »
New document added about adjusting the trimmer resistors:

http://audioxxx.googlepages.com/W492_trimmer_adjustment.pdf

fantomas

Neumann W492 equalizer DIY project
« Reply #68 on: July 20, 2008, 03:27:17 PM »
any chance to put the PCB image to etch my own boards¿

Neumann W492 equalizer DIY project
« Reply #69 on: July 21, 2008, 01:04:21 AM »
Talked before.

Boards are double sided with plated holes, so it is practically impossible to make them at home.


kazper

Neumann W492 equalizer DIY project
« Reply #70 on: July 23, 2008, 02:47:18 AM »
Any chance we could go through Omeg on the pots. ECO line?
Intentionally left blank

Neumann W492 equalizer DIY project
« Reply #71 on: July 23, 2008, 03:23:14 AM »
You can use any conductive plastic potentiometer. Manual wiring is of cource needed with those types that don't fit mechanically on the pcb. Carbon potentiometers are not recommended. They start to scratch quite soon because the circuit is dc coupled.

Purusha

Neumann W492 equalizer DIY project
« Reply #72 on: July 24, 2008, 07:55:18 AM »
What kind of toroid do I need for this project?
Regards as always, Purusha

Purusha

Neumann W492 equalizer DIY project
« Reply #73 on: July 24, 2008, 04:05:31 PM »
What toggles we need for this project SPDT or DPDT?
Regards as always, Purusha

Neumann W492 equalizer DIY project
« Reply #74 on: July 25, 2008, 02:57:32 AM »
Transformer can be quite small. Current consumption of the eq is about 70 mA per channel.

Switches are SPDT (simple one pole on/off switches). See the wiring diagram.

king-rb

Neumann W492 equalizer DIY project
« Reply #75 on: July 25, 2008, 04:03:49 AM »
"conductive plastic potentiomenters" where can i get some in germany=? its okay if they dont fit on the pcb..

Michael Tibes

Neumann W492 equalizer DIY project
« Reply #76 on: July 25, 2008, 04:15:34 AM »
RS components should have them, I think most of their range is conductive plastic. Don't know if they're the cheapest though.

Michael

Neumann W492 equalizer DIY project
« Reply #77 on: July 26, 2008, 02:39:38 PM »
Does someone know of a company that stocks and sells the sfernice p11 with the special request for inter liniarity?

kazper

Neumann W492 equalizer DIY project
« Reply #78 on: July 26, 2008, 03:51:59 PM »
Any one look into Omeg for the pots?

Conductive plastic track giving a life of 20x103 cycles (or over twice the life of carbon tracks) I think they will work.

http://www.omeg.co.uk/pce16brc.htm



http://www.omeg.co.uk/e2ge16bc.htm



Kevin
Intentionally left blank

Rossi

Neumann W492 equalizer DIY project
« Reply #79 on: July 26, 2008, 04:20:40 PM »
Would wire wound pots do? Reichelt has 10k 4W wire pots @ € 2.50 apiece. No duals, though.
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