I need to interface a Piezoelectric transducer sensor which will pick up frequencies up to 1000Hz. It was advised to me to use a JFET source follower circuit. The piezo transducer is simulated here as a AC source in series with a capacitor (10nF), as I understand the Piezo needs a very high input impedance so I haven't connected a RG across the input of the JFET since that would effectively bring down the input impedance of the circuit.
When simulating this circuit, the output gives me 0V and I assume that the biasing is not right; placing a resistor across the gate brings down the signal to 0V DC but the output is still 0V. Now, if I get rid of C3 and R2 and I measure from the source, I get a signal with lower amplitude than the input and with a DC offset. Any suggestions??
When simulating this circuit, the output gives me 0V and I assume that the biasing is not right; placing a resistor across the gate brings down the signal to 0V DC but the output is still 0V. Now, if I get rid of C3 and R2 and I measure from the source, I get a signal with lower amplitude than the input and with a DC offset. Any suggestions??