Maker Pro
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preamp project.

D

Dope mcSmoke

Jan 1, 1970
0
Hi.
I'm into building a simple preamp for recording guitar straight into my
soundcard.
Has anyone here ever done something like that? First a buffer to get the
impedances right, then maybe some amplification and filtering to somehow
simulate a guitar amp.

Would you suggest OP's or transistors for a project like this?
Im more familiar with OP's but many people don't like their audio
capabilities..

Thanks
/Johan
 
J

Jupitersally

Jan 1, 1970
0
Dope mcSmoke said:
Hi.
I'm into building a simple preamp for recording guitar straight into my
soundcard.
Has anyone here ever done something like that? First a buffer to get the
impedances right, then maybe some amplification and filtering to somehow
simulate a guitar amp.

Would you suggest OP's or transistors for a project like this?
Im more familiar with OP's but many people don't like their audio
capabilities..

Thanks
/Johan

Seems like a simple solution to develop :)
National semiconductor has a very wide range of audio amplifiers that
can be easily deployed. Get one that has the lowest THD and highest
SNR that will fit your budget.
Another option might be to design a dual band op-amp circuit. Any JFET
input op-amp (LF 411/2 or LM 358) should do, since the sound card has
only a 44.1kHz band width. If you want lower THD, you can go in for a
precision op-amp (like OP-07 or OP-27 derivatives) In this case, it
might be also possible to tweak around with the frequency bands.
About using transistors... my advice don't even try to build a circuit
with them. Anyway at 44.1 kHz, op-amps will perform equally well as
transistors or tubes.

Aditya
 
D

Dope mcSmoke

Jan 1, 1970
0
Thanks.

SNR-> Sound/noise ratio ok
THD-> ???

If i were to build it on 741 or TL072 or other cheapo OP's would there be a
noticeable difference in sound/noise and such?
(well, your examples was cheap too, are they audio specific amps?)

My idea so far is mainly:
Input buffer - Voltage follower (possibly w gain)
(some distorsion stage w/ bypass)
2nd order bandpass w OP @ 300 Hz and 10 kHz (gain?)
passive filters @ 150 Hz and 15 kHz
output level pot

/Johan
 
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