Preamplifier's universal input board building info/support

« **on:** January 24, 2009, 04:09:19 PM »

Hi to all, here's another usefull thing...
No need to talk much, just see schematics and pictures.

http://i251.photobucket.com/albums/gg291/diy33609/in_di_assembled.jpg
http://i251.photobucket.com/albums/gg291/diy33609/in_di_pcb.jpg
http://i251.photobucket.com/albums/gg291/diy33609/pre_in_pcb.gif
http://i251.photobucket.com/albums/gg291/diy33609/pre_in_sch.gif

Kit contains:
-PCB, switches, input Jack, transistors, relay.

http://i251.photobucket.com/albums/gg291/diy33609/P1000157.jpg

Ordering:

http://www.groupdiy.com/index.php?topic=29771.0

« **Reply #1 on:** January 24, 2009, 05:00:14 PM »

Looks better suited for the Black Market.

Please split into ordering (BM) & building-info/support (here in The Lab).

Regards,

Peter

« **Reply #2 on:** January 24, 2009, 10:20:38 PM »

sorry for the newbie question, but, what is this?is it based on something?

« **Reply #3 on:** January 25, 2009, 08:07:50 AM »

@ Peter: Agreed!

@pedroplanet: say, you cloning 1272 and need input board with
pad, phase, phantom and HI-Z DI discrete circuit
before input transformer...here it is.

« **Reply #4 on:** February 11, 2009, 08:28:24 AM »

so..........does it works with this project:

http://www.groupdiy.com/index.php?topic=22828&start=0

neve 1073 preamp......

if its ok, how to connet it?

excuse me foe my newbie question........

niko

« **Reply #5 on:** February 11, 2009, 08:36:26 AM »

Well it says universal! it fits any front end preamp!
but to answer your question yes it will work!

wiring its very simple you wire the mic where it says mic, the preamp from where it says pre.
you need to feed this with 24V and 48V where its marked.
look at this image:

« **Reply #6 on:** February 11, 2009, 12:25:47 PM »

ok, thanks 3nity
and excuse me for my newbie question......

« **Reply #7 on:** February 19, 2009, 04:30:59 PM »

hi Igor, could you give us the cut size for the front panel please, i would to buy some kit but i need to know if it's possible to add it on my front panel.
thanx

« **Reply #8 on:** February 20, 2009, 09:00:21 AM »

Here's the measures.

You can use it as drilling template, resolution is 300dpi.

http://i251.photobucket.com/albums/gg291/diy33609/in_pcb.jpg

« **Reply #9 on:** February 20, 2009, 11:51:31 AM »

thanx Igor

« **Reply #10 on:** March 17, 2009, 10:22:53 PM »

is it similar to the JLM go between?

« **Reply #11 on:** March 18, 2009, 06:15:44 AM »

Same purpose, but bit different idea, different schematic. Just compare by schematics etc.

« **Reply #12 on:** May 23, 2009, 05:03:26 AM »

Igor,

do you accidentally have a source for the gain knob on the ba-33 amplifier as shown right at the picture?

thanks!
christoph

« **Reply #13 on:** August 09, 2009, 08:35:26 AM »

Hi...I assume D3,4,5,6 are 4148 correct??
Do not know what D2 is...914 , is it swapable with another # ?

Regarding C3 , what do you meant by "C34,5x11" ??

Edit : 1N914 eg:[email protected]

« **Reply #14 on:** August 09, 2009, 11:40:11 AM »

Hi, all diodes are 1n4148 or 1n914.
4.5x11 came from Eagle package, it is measures, don't relate to this.

« **Reply #15 on:** August 10, 2009, 01:23:15 PM »

Thanks for the reply,
"22utant" makes me wonder if it should be a tantalum cap?
The one on your pic seem to be polarised lytic...What should I do please ?

Also , I've had short search about 520R , seems hard to find (Banzai , Selectronic...)Would 510R do the trick?

« **Reply #16 on:** August 10, 2009, 01:27:51 PM »

Some times yoyu can use lytics in place of tants...and vice versa..

« **Reply #17 on:** August 10, 2009, 01:31:48 PM »

Great!Thanks 3nity!

« **Reply #18 on:** August 15, 2009, 08:28:19 AM »

Hi
what voltage should the 1uf and 22uf tantalum capacitor be? I have 22uf 16v can i use that?

/Taz

« **Reply #19 on:** August 21, 2009, 09:37:13 AM »

would this work with +18 instead of +24? Maybe a voltage drop resistor & a 12 volt relay.... this would open it to use with other preamps that do not use +24V.
Does the JFET DI really need +24, or would it work fine with +18? It seems like an 18 volt swing into a mic pre would be plenty.....
What are the board dimensions?

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