Hybrid 312 PCB

[imo]

double post

 

[imo]

500 series indeed. I made a homemade pcd from the 312 card layout, but using that layout is pretty backwards, especially if you use the 150/600 wiring for the cinemag in. I have a lot of components crossing eachother, and it is probably too wide as it is to fit. I have been trying to think it through layout wise so that it makes more sense. It seems like there would be a demand for it.
Ian

 

[mitsos]

wow, looks real nice.

About the XLRs, Give a call to Joseph Electronics. www.josephelectronics.com
They don't have much in terms of online sales that I can see... The CA store is closer to you, but George at the Niles store has helped me out on a number of occasions with some very good discounts. Anyway, they've been much cheaper for Neutrik, Switchcraft, Canare, and Belden than anywhere else I've seen.

hope that helps..

 

[Bluzzi]

[quote author="Miska"]

I'm waiting for somebody to do the 312 in a 500 series format

...same here. [/quote]

I believe 3nity is working on one at the moment.

jim

 

[okgb]

Fabio's 312 , although hard to get at the moment contains servo options
, 3nity's seemed in the spirit of the B.A. making them easy to get 4 in a 1ru

Rob [ handcrafted tone ? ] made a straight 312 card style for those who
want authentic and or basic .

As soon as someone figures a way to make 500 racks for a decent price ,
demand for the modules should increase ...................any moment now !

 

[Bluzzi]

My beef with 500 style is mainly case cost and power supply stuck at 1 voltage. I know you could use DC to DC converters but that increases complexity and cost. Not that circuits operating at +-15 or +-18 vdc (I forget which is API spec) don't sound great but +-24vdc would have been a better choice. All the pres I like run at 24vdc or higher (GR, NEVE, John Hardy).

To be fair the idea of 1 Power Supply does make a lot of things easier and cheaper. I guess its mainly the case that has to be more affordable...for a cheap bastard like me!

The world is going 500 crazy!


jim

 

[Rogy]

Hi Bob,

What input bias correction schematic did you use?

I breadboarded and tested a 312-style pre but with a discrete opamp similar to Samuel Groner's SGA-SOA and used the bias compensation scheme from the Hardy M1, but that did not allow for a good and stable compensation.

I'll try the circuit provided in Samuel's SGA-SOA documentation to see if it's more succesful in my application.

Thanks,


Rogy

 

[okgb]

SSL tech offers a voltage arguement on the eisen / diode thread
and i agree +/- 18 v is not so bad , but one could have a
" high voltage " rack and a " vintage " rack , of course once
we figure out the ecomony of scale for building these

 

[bobschwenkler]

[quote author="Rogy"]Hi Bob,

What input bias correction schematic did you use?

I breadboarded and tested a 312-style pre but with a discrete opamp similar to Samuel Groner's SGA-SOA and used the bias compensation scheme from the Hardy M1, but that did not allow for a good and stable compensation.

I'll try the circuit provided in Samuel's SGA-SOA documentation to see if it's more succesful in my application.

Thanks,


Rogy[/quote]

I used the M1 schematic. I still need to run further tests on the PCB, but it seemed to be working properly, with no input offset.

 

[bobschwenkler]

Hi all, just an update to this thread. I'll be placing an order for a run of boards this evening!

Check for details at www.bicyclerecordings.com/312

 

[okgb]

Does anyone think it practical or possible to design a circuit board
that has two opamps and servo but could be configured for a single
version so to go from 312 to dual if desired ?

I think you'd really have something there , best of both worlds

Sorry not to jack the thread from your board offering

 

[bobschwenkler]

Just thinking off hand and not very deeply about it it seems possible.

 

[mrc]

10 please
mrc

 

[bobschwenkler]

For anyone following this thread who's interested in these boards, they're now available for sale!

www.bicyclerecordings.com/312

 

[kato]

Bob, just visited your page - you recorded someone named Jenny Jenkins?

I wonder if she knows the song: Jenny Jenkins - as covered by Lisa Loeb.

 

[bobschwenkler]

Oh, that's funny! I'll have to pass that on to her. I've never heard the song...

 

[pacorro]

anybody knows something about this guy?
I paid for a couple of cards some weeks ago and I don't know nothing about the stuff. He's not asking my emails now :-\

 

[okgb]

This is an old thread , did you talk to him first ?
He had sold a successful run of boards here, not sure when he was last active
but no problems at THAT time .