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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: Church-Audio on September 20, 2007, 01:06:43 PM

Title: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: Church-Audio on September 20, 2007, 01:06:43 PM
I had a request for a mono input preamp with 4 mono inputs and one summed stereo output so this is what I built.

Its got 3 levels of gain per channel with a variable output so that the output can be mixed.. there are two stereo high pass filters for each "set" of inputs. and an on/off switch. When an input is not being used you simply turn it's output level to the off position and it takes the output of that channels preamp out of the circuit to reduce noise. Kinda like a mute switch on a recording console..
Each input has 10 volts of plug in power as well.
This preamp operates on two 9 volt batteries.


Chris Church
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: Tye on September 20, 2007, 02:21:12 PM
Looks nice Chris! thing looks like a tank!
 Do you fabricate the face/case yourself?

 
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: Church-Audio on September 20, 2007, 02:28:08 PM
Quote from: Tye on September 20, 2007, 02:21:12 PM
Looks nice Chris! thing looks like a tank!
 Do you fabricate the face/case yourself?

 
The face was fabricated by me.. But the case is an off the shelf hammond product.. And the cases are very solidly built..
Chris
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: NOLAfishwater on September 20, 2007, 05:45:29 PM
Looks killer. Do you have an ETA on offering these to the masses?  So technically you could run CA cards and omnis into your bit bucket.
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: Church-Audio on September 20, 2007, 06:49:39 PM
Quote from: NOLAfishwater on September 20, 2007, 05:45:29 PM
Looks killer. Do you have an ETA on offering these to the masses?  So technically you could run CA cards and omnis into your bit bucket.


There is no A-D converter on board its simply an analog preamp. I did not really want to offer this to the public but if there is enough interest maybe I will. I did not really want to turn this thread into a "sales" opportunity I just wanted to give you guys a look at some of the things I have done in the last little while.

I hope you dont misunderstand my response and take it as a negative one.. :) I am not trying to be rude.

Chris
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: yug du nord on September 20, 2007, 07:55:44 PM
Pretty sweet...  I bet you could market it if ya want to!!!  Same specs as your 9100?  Or something completely different?  Keep it up!!!
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: blindman on September 20, 2007, 11:17:35 PM
Nice looking preamp.

I bet you might get a market for 4 channel preamps in the next couple years... I bet someone will come out with an R9 sized 4 channel consumer grade deck in the next 2 years.

After reading that MIXY post, that would be another cool product for you... a Church Audio M/S mic with a mini decoder box to match.

thanx for sharing the pic.
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: rowjimmy on September 21, 2007, 08:37:12 AM
Nice looking box, Chris.
Thanks for sharing.
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: Roving Sign on September 26, 2007, 07:39:24 AM
neato  -

One observation - looks like the inputs, knobs and switches are really close together? - might just be the photo...

Chris - what is the feasibility of each channel having its own peak light? - I hate those one light set ups like the old Sony D5 Cassette recorders and the UA5...I mean - how do you know what channel is peaking?
Title: Re: Prototype of a custom preamp.. I thought you guys might want to look at this
Post by: capnhook on October 13, 2007, 11:12:21 PM

I was wondering what would move me from 3 mics to four ----------- niiiiiice, Chris!   ;D  :D :D ;D

BTW -- the ST-20 I got from you eons ago is still running like a champ.


I thought the US and Canadian dollars were at par just *aboot* ten days ago........whut happened??