Whats is mpf102 datasheet

mpf102 datasheet

I don't know how to convert the FET resistance changes to actual voltage sensed by the gate. The FET resistance is about the same as the other resistors in the bridge, 220 ohms. The FET is simply acting as a voltage controlled resistor in the bridge. When I read about using FETs in amplifier circuits they talk about having a much larger Vds than the 1.2 volts I have, and, as I said, I've found that increasing Vds or Id makes the "noise" much worse. The power supply is giving me 14.6 volts and is capable of supplying 1500 mA but I measure a current of only 9.91 mA through the bridge so the circuit is not underpowered. I have an idea for making a bridge consisting of 4 FETs connected so that they all change resistance appropriately with the sensed voltage thus giving me a signal up to 4 times stronger.
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