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Why should a JFET be operated with only reverse bias on the gate?
If the gate-channel junction of a JFET was not reverse biased the JFET would just act as a forward biased diode across that junction and the gate would cease to have any control over the channel conductance. For the same reason in a MOSFET the substrate-source/channel/drain junction must remain reverse biased. The MOSFET could not act as a MOSFET.
Can you use resistance in place of diode in clipping circuits?
no we not use resistance in place of diode.
Which diode does not use negative resistance in its operation?
Backward diode
Why fet operated in reverse bias?
you want to keep the channel electrically isolated from the gate (jfet) or substrate (mosfet) so that it operates as a fet, don't you? if it was forward biased it would just be a diode with no field effect.
How do you connect a motor to a picaxe 18M?
It depends. If you only want to turn the motor in one direction, then you could simply use a medium power mosfet (eg:IRF530) connected to an output pin on the PICAXE, and with a backward diode around the motor. If you need to change direction, it's best to use an L293D, which allows independent bidirectional control of two motors.
