Preamplifier's universal input board building info/support

Help Support GroupDIY:

Igor

Well-known member
Joined
Jul 17, 2006
Messages
2,193
Location
Israel
Hi to all, here's another usefull thing...
No need to talk much, just see schematics and pictures.

P1000134.jpg


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
 

Igor

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Joined
Jul 17, 2006
Messages
2,193
Location
Israel
@ 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.
 

nikonet

Member
Joined
Nov 17, 2008
Messages
19
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
 

3nity

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Joined
Dec 30, 2005
Messages
3,526
Location
MTL, CANADA
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:
pre_in_pcb.gif
 

Igor

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Joined
Jul 17, 2006
Messages
2,193
Location
Israel
Here's the measures.

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

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

Igor

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Joined
Jul 17, 2006
Messages
2,193
Location
Israel
Same purpose, but bit different idea, different schematic. Just compare by schematics etc.
 

crisotop

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Feb 22, 2007
Messages
710
Location
Linz / Austria
Igor,

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

thanks!
christoph
 

RedNoise

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Joined
Jan 12, 2008
Messages
1,411
Location
France
Hi...I assume D3,4,5,6 are 4148 correct??
Do not know what D2 is...914 , is it swapable with another # ? :p
Regarding C3 , what do you meant by "C34,5x11" ??



Edit : 1N914 eg:[email protected]
 

Igor

Well-known member
Joined
Jul 17, 2006
Messages
2,193
Location
Israel
Hi, all diodes are 1n4148 or 1n914.
4.5x11 came from Eagle package, it is measures, don't relate to this.
 

RedNoise

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Joined
Jan 12, 2008
Messages
1,411
Location
France
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?
 

nielsk

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Joined
Nov 12, 2004
Messages
1,570
Location
Megapopulas, Florida
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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