Topic: Plans for small batt powered pre?

[markdc70]

I've seen a few plans and kits for this, but not exactly what I want.  I need plans for a small battery powered, stereo, unbalanced mic preamp that has gain pots and clip leds.  Maybe max of 45 db gain.  Does anybody have any suggestions?  There is a lot of knowledge on this board, hopefully someone can point me in the right direction!

[Alchemy]

I am interested in this as well. 

[Church-Audio]

I've seen a few plans and kits for this, but not exactly what I want.  I need plans for a small battery powered, stereo, unbalanced mic preamp that has gain pots and clip leds.  Maybe max of 45 db gain.  Does anybody have any suggestions?  There is a lot of knowledge on this board, hopefully someone can point me in the right direction!

There are many designs its best to start with something like a simple two stage preamp with a small fet in the front end and a opamp like a 5532 or opa2227pa something like that. Let me know if I can help you out in any way.

[Alchemy]

Come to think of it, I do remember seeing a specific kit for sale on the web. I can't remember where it was, but I will try to find it again. I remeber it had the clipping led, the adjustable gain..etc... It wasn't the "project 66", or something like that.

edit: doesn't have it

[Alchemy]

found it:

http://www.cs.usm.edu/~jmneal/preamp1.htm

[Church-Audio]

found it:

http://www.cs.usm.edu/~jmneal/preamp1.htm

That preamp can only really do 20 db then you get into distortion if you try and make it do more.

[Alchemy]

found it:

http://www.cs.usm.edu/~jmneal/preamp1.htm

That preamp can only really do 20 db then you get into distortion if you try and make it do more.

I didn't think it could do much, considering it looked too simple.
What is it missing?

[Church-Audio]

found it:

http://www.cs.usm.edu/~jmneal/preamp1.htm

That preamp can only really do 20 db then you get into distortion if you try and make it do more.

I didn't think it could do much, considering it looked too simple.
What is it missing?

A fet front end  check this link out. http://www.record-producer.com/i/ina217-large.gif although not a fet front end a very simple preamp with about 30-40 db of gain very few parts.

[tapasboy]

cooll !!!!!!!!!!!!!!!!!!!!!!!!!!   


can someone describe that flat me with a plug 3.5mm and as river 9v battery?

thanks

[Church-Audio]

cooll !!!!!!!!!!!!!!!!!!!!!!!!!!   


can someone describe that flat me with a plug 3.5mm and as river 9v battery?

thanks

What? I dont understand what your saying

[tapasboy]

sorry :-(

Here is a XLR plug ... for normal small plugs of the microphone... Is the there same? Is there a guidance with test specification a battery? (9V)

Church : does the guidance look good? Will then learn to build...

[Alchemy]

found it:

http://www.cs.usm.edu/~jmneal/preamp1.htm

That preamp can only really do 20 db then you get into distortion if you try and make it do more.

I didn't think it could do much, considering it looked too simple.
What is it missing?

A fet front end  check this link out. http://www.record-producer.com/i/ina217-large.gif although not a fet front end a very simple preamp with about 30-40 db of gain very few parts.

Apparently that one is meant for XLR.  I need 1/8th.
I'm probably going to build the 12v version of this one:

http://sound.westhost.com/project13.htm

and then move into more complicated things like an opamp.

[tapasboy]

I need also:    3.5 mm   /  it´s in amerika 1/8" ....      (3.5 mm it´s in Germany...Europe)   and the plan with a 9V battery...