Topic: DIY preamps

[Nick's Picks]

http://sound.westhost.com/project66.htm

anyone ever build this?
looks cool.  i'm tempted to try.  its over my head, but I like a good frustration from time to time (outside of my wife)

[cmoorevt]

I only scanned it quickly, but I saw mention of a 15v power supply which might not be ideal.  I've also been toying with making my own for a while, but haven't quite found the right schematics.  Plus my EE skills suck.  I'd love to make something small and portable(aerco like) that I could run off 9v batteries.

[lordbelial]

I only scanned it quickly, but I saw mention of a 15v power supply which might not be ideal.  I've also been toying with making my own for a while, but haven't quite found the right schematics.  Plus my EE skills suck.  I'd love to make something small and portable(aerco like) that I could run off 9v batteries.

Yep!

You can try the small preamp from "poorlycondictioned".

[Nick's Picks]

you and your crazy ass chaulk board!

[Chuck]

http://sound.westhost.com/project66.htm

anyone ever build this?
looks cool.  i'm tempted to try.  its over my head, but I like a good frustration from time to time (outside of my wife)

The TLO7x op-amp is outdated. There are better chips out there now. The bi-polar power supplies adds unneccessary complexity. My next homemade pre will be transformer based with small rechargable batteries providing the phantom power. All I need is time    and money  . Not easy things to come by lately... 

[lordbelial]

http://sound.westhost.com/project66.htm

anyone ever build this?
looks cool.  i'm tempted to try.  its over my head, but I like a good frustration from time to time (outside of my wife)

The TLO7x op-amp is outdated. There are better chips out there now. The bi-polar power supplies adds unneccessary complexity. My next homemade pre will be transformer based with small rechargable batteries providing the phantom power. All I need is time    and money  . Not easy things to come by lately... 

Could you suggest a small schematic with a better chip? Or a better chip/opamp for this schematic? I'm not going to buid it aroun the TL07, but if you could tell me a better opamp, I'll try t build it then!

I'm gonna build the small pre with a LM833 and another one with NE5532 and see what happens. I've a small metal candy box and the budget will fit into perfectly. It will be a small and weird preamp as well... XD

[poorlyconditioned]

http://sound.westhost.com/project66.htm

anyone ever build this?
looks cool.  i'm tempted to try.  its over my head, but I like a good frustration from time to time (outside of my wife)

The TLO7x op-amp is outdated. There are better chips out there now. The bi-polar power supplies adds unneccessary complexity. My next homemade pre will be transformer based with small rechargable batteries providing the phantom power. All I need is time    and money  . Not easy things to come by lately... 

Could you suggest a small schematic with a better chip? Or a better chip/opamp for this schematic? I'm not going to buid it aroun the TL07, but if you could tell me a better opamp, I'll try t build it then!

I'm gonna build the small pre with a LM833 and another one with NE5532 and see what happens. I've a small metal candy box and the budget will fit into perfectly. It will be a small and weird preamp as well... XD

I think NE5532  is a good economy choice and OPA2134 is, supposedly, a bit better.  I couldn't tell the difference though.

I'm currently working an a circuit based on INA217 or INA103.  This chip requires a dual polarity power supply.  I'm planning to make this using a single Walmart (9V) battery and an LT1054 inverter/multiplier chip.  I'll post here (another blackboard pic!) if I get it working!!!

To the other folks out there.  Get over to that workbench and then post your results when you do.

  Richard

[Chuck]

Op-amp notes I have:

INA163   V3 and Mini-Me (According to Grace this chip has better consistency in manufacture than INA103)
INA103   V2

SSM2017   DMIC-20
INA217   A (better?) pin for pin substitute for the SSM2017
 
AD8620   A (better?) pin for pin substitute for the NE5532
AD712   A Grace Design like, musical substitute for NE5532 according to Doug Oade.
LM6172     A more Apogee like sounding alternative to the NE5532 according to Doug Oade. (video sounding op-amp)

BTW, the stock UA-5 is full of NE5532's. Most people think it's not the greatest sounding op-amp chip for microphone pre-amplifiers.

This is a thread on the Oade board that has some of Doug's thought on this issue:

http://www.oade.com/Tapers_Section/Forum/dcboard.php?az=show_mesg&forum=100&topic_id=104&mesg_id=104&listing_type=search

[lordbelial]

Op-amp notes I have:

INA163   V3 and Mini-Me (According to Grace this chip has better consistency in manufacture than INA103)
INA103   V2

SSM2017   DMIC-20
INA217   A (better?) pin for pin substitute for the SSM2017
 
AD8620   A (better?) pin for pin substitute for the NE5532
AD712   A Grace Design like, musical substitute for NE5532 according to Doug Oade.
LM6172     A more Apogee like sounding alternative to the NE5532 according to Doug Oade. (video sounding op-amp)

BTW, the stock UA-5 is full of NE5532's. Most people think it's not the greatest sounding op-amp chip for microphone pre-amplifiers.

This is a thread on the Oade board that has some of Doug's thought on this issue:

http://www.oade.com/Tapers_Section/Forum/dcboard.php?az=show_mesg&forum=100&topic_id=104&mesg_id=104&listing_type=search

Hi!

Thanks for the info.

Since i'm building the chip into a socket, I can build the preamp based in the NE5532 and then, if the samples of the different chips are sent to me, switch them in and out to see how they work.

Thanks dude!

[Lil Kim Jong-Il]

Chips are taken.

[mmedley.]

The chalkboard pic is too funny. 

+T

[poorlyconditioned]

I've got a couple INA103 I won't be using if someone wants them for a project.

Hey, I would *love* to get those 103's.  I've got some 217's now, but I'd like to try the 103's as well.

Please PM me.

Thanks,
  Richard

[Busman Audio]

Op-amp notes I have:


BTW, the stock UA-5 is full of NE5532's. Most people think it's not the greatest sounding op-amp chip for microphone pre-amplifiers.

http://www.oade.com/Tapers_Section/Forum/dcboard.php?az=show_mesg&forum=100&topic_id=104&mesg_id=104&listing_type=search

The UA-5 does not use NE5532s it uses the NEC 4570 pos. There are so many great op amps out there now that if you want your own sound for a pre do a lot of research and comparison.

[Chuck]

Op-amp notes I have:


BTW, the stock UA-5 is full of NE5532's. Most people think it's not the greatest sounding op-amp chip for microphone pre-amplifiers.

http://www.oade.com/Tapers_Section/Forum/dcboard.php?az=show_mesg&forum=100&topic_id=104&mesg_id=104&listing_type=search

The UA-5 does not use NE5532s it uses the NEC 4570 pos. There are so many great op amps out there now that if you want your own sound for a pre do a lot of research and comparison.

Opps... 

My bad. The AD-1000 is full of NE5532's.

Carry on...

[poorlyconditioned]

Op-amp notes I have:


BTW, the stock UA-5 is full of NE5532's. Most people think it's not the greatest sounding op-amp chip for microphone pre-amplifiers.

http://www.oade.com/Tapers_Section/Forum/dcboard.php?az=show_mesg&forum=100&topic_id=104&mesg_id=104&listing_type=search

The UA-5 does not use NE5532s it uses the NEC 4570 pos. There are so many great op amps out there now that if you want your own sound for a pre do a lot of research and comparison.

I'm going to try to trace the UA5 when I get a chance.  I've got some OPA2134 (TI samples!).  Either that, or I'll use AD712/AD8620 that Oade recommends.  I just have to find out what ones to replace.  Perhaps just one or two on the mic pre inputs.  Has anyone dissected one of Oade's mods?

For now I'm going to build a homemade pre based on INA217 or INA103 (Thanks, L'il Kim!!).  I'll post a "chalkboard" if I get anything working...

  Richard