T
Tom
Hi group,
I must put together a single channel low-voltage (~2v) balanced mic
compatible preamplifier in order to interface a
dynamic/balanced/moving coil mic to a host circuit that was designed
to operate with for a 2-wire 'phantom' powered electret capsule (ECM)
My circuit must operate on the small power that the host would
otherwise provide to the ECM. I've measured this and ascertained that
it supplies circa 1.5 - 2.1v via 1k8 so my dynamic mic pre-amp will
need to be quite low power.
So, my plan is presently to use one of National Semi's electret
pre-amps (Ref1) in a modified configuration to amplify my dynamic mic,
single-ended but interface with a 2-Wire ECM powering configuration.
Has anybody come upon any suitable circuits that might save me some
design time?
Tom
Ref1:
National Semi LMV1032
http://www.national.com/mpf/LM/LMV1032.html#Overview
National Semi LMV1012
http://www.national.com/mpf/LM/LMV1012.html#Overview
I must put together a single channel low-voltage (~2v) balanced mic
compatible preamplifier in order to interface a
dynamic/balanced/moving coil mic to a host circuit that was designed
to operate with for a 2-wire 'phantom' powered electret capsule (ECM)
My circuit must operate on the small power that the host would
otherwise provide to the ECM. I've measured this and ascertained that
it supplies circa 1.5 - 2.1v via 1k8 so my dynamic mic pre-amp will
need to be quite low power.
So, my plan is presently to use one of National Semi's electret
pre-amps (Ref1) in a modified configuration to amplify my dynamic mic,
single-ended but interface with a 2-Wire ECM powering configuration.
Has anybody come upon any suitable circuits that might save me some
design time?
Tom
Ref1:
National Semi LMV1032
http://www.national.com/mpf/LM/LMV1032.html#Overview
National Semi LMV1012
http://www.national.com/mpf/LM/LMV1012.html#Overview