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Old 9th January 2008, 03:23 PM   #1
nigejin is offline nigejin  China
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Default who have a sch for mic amps ,

i have finished one with s5532,very simple one,it work well,i now want to do a batter one.i evern seem a classic one with chip and transistor,but canot find it,please Recommended some,thanks
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Old 9th January 2008, 06:03 PM   #2
Minion is offline Minion  Canada
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Why not look into the TI INA217 Mic preamp IC?? They are extremely low noise and Very high gain and have ballanced inputs and low impedance unballanced outputs....

The data sheet has a schematic for the mic preamp.....


http://focus.ti.com/lit/ds/symlink/ina217.pdf


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Old 10th January 2008, 12:28 PM   #3
gootee is offline gootee  United States
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You might also want to download Section 6 of Walt Jung's "Op Amp Applications Handbook", from Analog Devices Inc, at http://www.analog.com/library/analog..._handbook.html . There are some good mic amp schematics, in there.
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Old 10th January 2008, 06:19 PM   #4
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If you don't mind something more complicated, look here:

Prodigy Pro Forum: Mic Preamp list

Here are some nice hybrid discreet/op amp designs:

Mic Preamp Schematic Collection

The Valley People model 400 is another hybrid design:
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Old 17th January 2008, 06:18 PM   #5
ppa is offline ppa  Italy
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there are two mistakes in the schematics , the positive input and the negative input of the both op amp 071 are inverted.
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Old 17th January 2008, 07:23 PM   #6
ppa is offline ppa  Italy
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the + and - in the op amps are inverted but the pin n is correct.


this preamp is critic , there are a world famous mic preamp designed by Mr. Neve:

http://www.gyraf.dk/schematics/Amek_2500_micamp.gif
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Old 17th January 2008, 07:47 PM   #7
ppa is offline ppa  Italy
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I forgotten I have designed a mic preamp using my discrete op amp but it's exspensive to realize.
In Italy, very important studio recording think It's a top level preamp and they prefer it to ams neve 1073.
It's for international market and will cost 1800 euro.

Also I have designed a mic preamp using integrated op amp, it's cheap and not critic. I could give you the schematic, I haven't realized it but I have simulated it only, and it runs well.
There are not trimmers or regulations in the circuit.

Another solutions are the THAT IC preamplifiers

http://www.thatcorp.com/1500desc.html

in the datasheet you can find a very simple, trimmerless, cheap, and good sounding mic preamp.
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