This circuit, found in a publication of the year 1968, uses a MOSFET at the input to increase input impedance. Voltage gain is about 1 000 and the bipolar transistor can be replaced by modern types.
This circuit, found in a publication of the year 1968, uses a MOSFET at the input to increase input impedance. Voltage gain is about 1 000 and the bipolar transistor can be replaced by modern types.
