Re: Microphone (3.5mm plug) to an ADC (phono interface)

Well I don't have much choice with using phonos as input as these are
fixed, however I do need to be able to connect microphones to phono
sockets. As you have quoted, the microphones I intend to use are just
low-cost electret based microphones. I haven't quite determined what
type of input the phono inserts are. I need to look into this. I do
have electret microphones that come with power, so given the right plug
converter, this could work.

If you have info on the different types of phono sockets, that would be
helpful.

Best Regards,

Binod


Gerard Bok wrote:
> On 14 Nov 2005 15:16:02 -0800, "binodbista@xxxxxxxxx"
> <binodbista@xxxxxxxxx> wrote:
>
> >Basically I want to connect a microphone which has a 3.5mm end and
> >connect this into a phono input.
> >
> >I was told I need to do something in between as it's a microphone input
> >and it is not as simple as just using a 3.5mmm to phono converter
>
> A phono input applies some frequency corrections, known as RIAA
> correction. Basically, a phono input boosts low frequencies while
> dimming high tones.
> Apart from that correction, 'phono input' does not fully
> describe the type of input. It can be meant for anything from
> crystal to MD to moving coil.
>
> Also important to know is the type of microphone involved. Most
> low-cost microphones are elektret nowadays. Which means, that
> they output a voltage that is OK for a crystal type input but is
> far to high for any other phono input.
> Elektret also requires either some powersupply (not available on
> a phono input) or a high impedance input (available if the phono
> input is suitable for crystal; but most aren't.)
>
> If your microphone is of the 'dynamic' type, the voltage levels
> won't cause any problem if the phono input is meant for MD. (Most
> are.)
>
> All by all: using a phono input to amplify a microphone is not
> the easiest way to go :-)
>
> --
> Kind regards,
> Gerard Bok

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