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Maybe.Hi
If i supply 12v for 741 will that work ok?
If you don't need the minimum ON resistance from the transistor, such as for a high impedance audio circuit, 5V Vgs may be sufficient to turn on the MOSFET sufficiently for the circuit requirements. For example Figure 2 in the Fairchild data sheet for the bs170\mmbf170 shows a nominal ON resistance of about 1.5 times minimum at Vgs = 5V at low currents which gives a 7.5 ohm maximum ON resistance. This is low compared to most audio circuit impedances.Hi
Here is a circuit that i found on the net that use mmbf170 fets to switch audio from
the detectors to the audio amp.
The gates are fed from a pic (direct).
How can this be ?, When the bs170\mmbf170 has a VGSS Gate-Source Voltage ± 20 V.
you will need about at least 10 volts on the MOSFET gate to turn it fully on?
Why not use a modern opamp that is guaranteed to work with a 12V supply?
Then you can tell your teacher where to go.