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Gear / Technical Help => Battery Boxes, Preamps, Mixers, ADCs, and Processors => Topic started by: pridix on February 28, 2012, 10:51:48 AM

Title: Battery Box or Preamp schematics!
Post by: pridix on February 28, 2012, 10:51:48 AM: Hi!

I'm finishing my studies about Telecommunications Engineering this year and I have a few subjects about electronics and circuits and I wanted to do some real projects about it. As I'm starting taping I'm really curious about sound-related things. As I haven't had nor a battery box or a preamp yet I thought could be great to start my electric projects with something like that. Does anyone have preamp schematics? I want to use it with microphones ended in minijack.

Thank you so much
Title: Re: Battery Box or Preamp schematics!
Post by: LikeASong on March 12, 2012, 02:24:28 PM: I shamelessly bump this topic asking for the same thing: some schematics of a decent preamp. There's some on the internet but they're whether too simple (for a mono input) or too complicated. I would like to build a simple. ChurchAudio-like stereo preamp.

Thanks in advance!
Title: Re: Battery Box or Preamp schematics!
Post by: hi and lo on March 12, 2012, 02:50:29 PM: If you're both looking for an educational project, I might recommend starting simple with a CMOY headphone amp. It's not a perfect apples to apples comparison to microphone pre's, but will get you started down the right path.
Title: Re: Battery Box or Preamp schematics!
Post by: pridix on March 12, 2012, 02:56:46 PM: Thank you so much, hi and lo
Title: Re: Battery Box or Preamp schematics!
Post by: LikeASong on March 12, 2012, 03:05:55 PM: Quote from: hi and lo on March 12, 2012, 02:50:29 PM
If you're both looking for an educational project, I might recommend starting simple with a CMOY headphone amp. It's not a perfect apples to apples comparison to microphone pre's, but will get you started down the right path.
Thanks for the suggestion, but I'm not following the educational path. I am proficient with the soldering iron and pretty knowledgable in electronics -if I might say so- , so I would like to build a mic preamp directly, without simple starts. I've done similar things before and they all are working after years of use, so I think I could get decent results building a preamp. It's just that I need a good schematic for it.
Title: Re: Battery Box or Preamp schematics!
Post by: kirk97132 on March 12, 2012, 03:27:39 PM: Quote from: LikeASong on March 12, 2012, 03:05:55 PM
Quote from: hi and lo on March 12, 2012, 02:50:29 PM
If you're both looking for an educational project, I might recommend starting simple with a CMOY headphone amp. It's not a perfect apples to apples comparison to microphone pre's, but will get you started down the right path.
Thanks for the suggestion, but I'm not following the educational path. I am proficient with the soldering iron and pretty knowledgable in electronics -if I might say so- , so I would like to build a mic preamp directly, without simple starts. I've done similar things before and they all are working after years of use, so I think I could get decent results building a preamp. It's just that I need a good schematic for it.
http://www.fivefishstudios.com/diy-kits
Title: Re: Battery Box or Preamp schematics!
Post by: hi and lo on March 12, 2012, 05:09:56 PM: Quote from: LikeASong on March 12, 2012, 03:05:55 PM

Thanks for the suggestion, but I'm not following the educational path. I am proficient with the soldering iron and pretty knowledgable in electronics -if I might say so- , so I would like to build a mic preamp directly, without simple starts. I've done similar things before and they all are working after years of use, so I think I could get decent results building a preamp. It's just that I need a good schematic for it.

Gotcha... fire up SPICE and design your own circuit then! Kirk poitned out the fivefish stuff which I completely forgot about and there are all kinds of kits for home discrete and tube amplifiers, but you're not gonna find too many published circuits for small 2-channel preamps. Jensen's website might have a few good ones as will some op amp publications.
Title: Re: Battery Box or Preamp schematics!
Post by: DigiGal on March 12, 2012, 06:28:05 PM: Kirkd pointed out Five Fish Audio kits an excellent choice.

A Less expensive alternative for a student budget is a kit from PAiA...

http://www.paia.com/phantom.asp

(http://www.paia.com/prodimages/phantsch.gif)
Title: Re: Battery Box or Preamp schematics!
Post by: pridix on March 12, 2012, 06:36:20 PM: Great!!! Thanks for the answers everyone!
Title: Re: Battery Box or Preamp schematics!
Post by: Church-Audio on March 12, 2012, 07:01:06 PM: There is no circuits out there. The best way to start is looking at product data specs and sample circuits and start from there. Simple also invest in a bread board. Sprice is nice but reality is better. Some things that work in spice dont work in the real world.

bread board and some parts is where I started I also helps to have some really REALLY smart friends who can help you when you are lost.

Chris
Title: Re: Battery Box or Preamp schematics!
Post by: pridix on March 12, 2012, 07:18:10 PM: Thanks for the tip Chris, your replies as well as the others are always welcome. I use to do all my projects on a protoboard before doing them in a real pcb and soldering. It's a great way to try ;D
Title: Re: Battery Box or Preamp schematics!
Post by: illconditioned on March 12, 2012, 08:56:40 PM: The is a Yahoo "group" called "micbuilders". Lots of folks out there build circuits and also modify mic capsules.

A whole lot of fun/diversions over there.

Richard