Topic: 3 Wire Pre Vs Beyer Dynamic MV100

[poorlyconditioned]

....But the second design you show is typical of most of these small preamps.  I based my design on it as well.  The first design is too simple, and will have higher distortion than the second.

  Richard

Have you experimented with the different opamps in this circuit, Richard? The TL072, LM833 and NE5532 or any other?
Which one would you recommend for which reason?
I"d like to build one and run it with a single 9 Volt battery which excludes the LM833 since it is said to needs 2 batteries. Is the NE5532 best, would a TL062 also do?
Any other important observations that would help?

thank"s

For a cheap unit I recommend NE5532, or the Burr Brown Chips (OPA-2227/2228).  I couln't hear much difference between these.

You might get better sound with some fancier chips, but start simple first.

  Richard

[kuuan]

For a cheap unit I recommend NE5532, or the Burr Brown Chips (OPA-2227/2228).  I couln't hear much difference between these.

You might get better sound with some fancier chips, but start simple first.

  Richard

Thank's Richard,

yesterday I finally had time to build the preamp. I followed Tompolk's board layout, but it did not work and I could not find out yet why.

Before I start to redo all please let me ask:
The publisher of the circuit had later added, quote: now I would use 1uF film capacitors as input and output capacitors.. Therefore I had substituted all 4 pieces 2,2uF aluminium caps with 1uF poly caps. These poly caps have no polarity whereas the original alu caps did have. Is this is why it is not working?

BTW I could not get the NE5532, only the TL072, but I also have a BurrBrown OPA2604AP which I want to try out.

andreas

[Church-Audio]

....But the second design you show is typical of most of these small preamps.  I based my design on it as well.  The first design is too simple, and will have higher distortion than the second.

  Richard

Have you experimented with the different opamps in this circuit, Richard? The TL072, LM833 and NE5532 or any other?
Which one would you recommend for which reason?
I"d like to build one and run it with a single 9 Volt battery which excludes the LM833 since it is said to needs 2 batteries. Is the NE5532 best, would a TL062 also do?
Any other important observations that would help?

thank"s

For a cheap unit I recommend NE5532, or the Burr Brown Chips (OPA-2227/2228).  I couln't hear much difference between these.

You might get better sound with some fancier chips, but start simple first.

  Richard

The major difference between the burrbrown and the TI chips, is distortion the Burr brown has much less. Also better headroom in the same exact circuit. And last but not least much less self noise.

[kuuan]

thank's Chris.

By now the preamp is working, tried it with all the three opamps.

This is the opinion of a newbee and could be an early call:
For recording ambience, audio to use for my videos, I will prefer the project13 preamp simply because it gives more gain, and I foind it very quiet. Using the 'geocities' preamp with my set up I'd have to add gain from the iriver's preamp and that is noisy.
I don't know about distortion and headroom though.

[poorlyconditioned]

thank's Chris.

By now the preamp is working, tried it with all the three opamps.

This is the opinion of a newbee and could be an early call:
For recording ambience, audio to use for my videos, I will prefer the project13 preamp simply because it gives more gain, and I foind it very quiet. Using the 'geocities' preamp with my set up I'd have to add gain from the iriver's preamp and that is noisy.
I don't know about distortion and headroom though.

+T to both you and Chris for keeping the DIY thread alive.  I'm taking a break for a while.  Well, if you can call "double taping" (two venues simultaneously), and running wires in various venues a break .

  Richard

[kuuan]

+T to both you and Chris for keeping the DIY thread alive.  I'm taking a break for a while.  Well, if you can call "double taping" (two venues simultaneously), and running wires in various venues a break .

  Richard

DIY is fun!
Would love to give you a break - during your break - by lending you a hand or two, would be a long desired learning experience, and fun!
enjoy and don't get endangled in wires!

Still trying to learn here:
with the 33k increased to 100k, the 1k5 not lowered, though higher the gain is still lower than the project13's