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In Reply to: Depends on the cartridge impedance. posted by garth on December 2, 2005 at 21:05:15:
The first cartridge has a short circuit output current of 10 microamps, the second has 100 microamps. A voltage amplifier would see tham as almost the same, a transimpedance amplifier sees the second as having ten times the ouput of the first.It's a bit like the difference between a garden hose and a fire hose, both operating at the same pressure. If you just measure the pressure, they are the same. If you measure the flow, they are not.
In this analogy a transimpedance amplifer is like a turbine wheel - it doesn't much care about the pressure, it responds to flow rate.
Mark Kelly
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Follow Ups
- Depends on the cartridge current. - Mark Kelly 21:54:42 12/02/05 (0)