I have a circuit design that I believe will work, but I need to change the transistor from a BJT to a FET for lower on resistance. Can anyone help?
The circuit is very simple.
It is a transistor PNP with a diode placed between the base and emitter. A rechargeable 12V battery is placed from gnd to the emitter. The base is supplied with 14V and the collector has 12V on it.
Normally the transistor is off and the battery is charged via the diode. When the supply drops out the 14V and 12V supplies go to ground. The battery then turns the transistor on and supplies the power.
I need a fet in place of the transistor to lower the on voltage drops.
The circuit is very simple.
It is a transistor PNP with a diode placed between the base and emitter. A rechargeable 12V battery is placed from gnd to the emitter. The base is supplied with 14V and the collector has 12V on it.
Normally the transistor is off and the battery is charged via the diode. When the supply drops out the 14V and 12V supplies go to ground. The battery then turns the transistor on and supplies the power.
I need a fet in place of the transistor to lower the on voltage drops.
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