Hello, to all.
I have a transducer with a very large output resistance, more than my multimeter can measure ( >>1Mohm).
I want to connect it into an absolute value circuit, presumably it (also) needs an amplification..
My question is:
Is there an easy/specific way to make a low noise amplifier of high input impedance to "link" the transducer to the absolute value circuit?
Can anybody suggest a schematic?
(I am looking for a cheaper solution to the one an "instrumentation amplifier" can provide..)
And what are the main problems when the amplifier does not have an appropriate input resistance? (i.e low signal...anything else?!?)
PS:The transducer is of a condenser material, similarly-working as a condenser electret capsule;
yet it does not have a factory-build FET amplifier to it, so it cannot be easily linked to other circuits.
Hope somebody can help,
regards,
xmat.
I have a transducer with a very large output resistance, more than my multimeter can measure ( >>1Mohm).
I want to connect it into an absolute value circuit, presumably it (also) needs an amplification..
My question is:
Is there an easy/specific way to make a low noise amplifier of high input impedance to "link" the transducer to the absolute value circuit?
Can anybody suggest a schematic?
(I am looking for a cheaper solution to the one an "instrumentation amplifier" can provide..)
And what are the main problems when the amplifier does not have an appropriate input resistance? (i.e low signal...anything else?!?)
PS:The transducer is of a condenser material, similarly-working as a condenser electret capsule;
yet it does not have a factory-build FET amplifier to it, so it cannot be easily linked to other circuits.
Hope somebody can help,
regards,
xmat.