Can I Replace at&t Router With My Own
In this mail service we discuss the method of correctly replacing a BJT with a MOSFET, without affecting the final outcome of the circuit.
Introduction
Until MOSFETs arrived in the field of electronics, transistors or BJTs to be precise ruled the power switching circuits and applications.
Though fifty-fifty Bipolar Junction Transistors (BJTs) can not be ignored due to there immense flexibility and low cost, MOSFETs also have certainly become hugely popular as far as switching heavy loads is concerned and due to the high efficiency associated with these components.
However even though these two counterparts may look similar with their functions and style, these two components are completely different with their characteristics and configurations.
Divergence Betwixt BJT and MOSFET
The main difference betwixt a BJT and a MOSFET is that, a BJT operation depends on current and needs to be proportionately increased with the load, whereas a mosfet depends on voltage.
Only here the MOSFET gets an edge over a BJT, because voltage can be hands manipulated and achieved to the required degrees without much trouble, in contrast increasing current means greater ability that'south to be delivered, which results in bad efficiency, bulkier configurations etc.
Another big advantage of a MOSFET against the BJT is information technology's high input resistance, which makes it possible to be integrated with any logic IC directly, no affair how big the load may exist that's being switched by the device. This advantage also allows us to connect many MOSFETs in parallel even with very depression current inputs (in mA).
MOSFETs are basically of two types, viz. enhancement mode type and depletion mode blazon. Enhancement type is more frequently used and is the prevalent one.
The N-type MOSFETs can be turned ON or activated by applying a specified positive voltage at their gates while P-blazon MOSFETs will require just the reverse that is a negative voltage to get plow ON.
BJT Base of operations Resistor vs MOSFET Gate Resistor
As explained to a higher place, a the base switching of a BJT is current dependent. Significant its base electric current needs to exist increased proportionately with increment in its collector load current.
This implies that the base resistor in a BJT plays an of import role and must be correctly calculated to ensure that the load is optimally switched ON.
However, the base voltage for a BJT does not affair much, as information technology tin exist as depression as 0.6 to 1 volts for a satisfactory switching of the continued load.
With MOSFETs it's just the opposite, you tin switch them ON with whatsoever voltage between 3 V and fifteen V, with current equally depression as 1 to 5 mA.
Hence, a base resistor may exist crucial for a BJT but a resistor for the gate of the MOSFET may be immaterial. That said, a low value gate resistor must be included, just to safeguard the device from sudden voltage spikes and transients.
Since voltages above five V or up to 12 Five are easily bachelor from most digital and analogue ICs, a MOSFET gate can be quickly interfaced with any such signal source, irrespective of the load electric current.
How to Replace a Transistor (BJT) with a MOSFET
In general nosotros can hands replace a BJT with a MOSFET, provided we take intendance of the relevant polarities.
For an NPN BJT, nosotros may supplant the BJT with a correctly specified MOSFET in the post-obit fashion:
- Remove the base resistor from the circuit considering we don't typically need it anymore with a MOSFET.
- Connect the gate of the N-MOSFET straight to the activation voltage source.
- Keep the positive supply continued to one of the load terminals, and connect the other concluding of the load to the bleed of the MOSFET.
- Lastly, connect the source of the MOSFET to ground.......Washed, you have replaced the BJT with a mosfet within minutes.
The procedure will remain as above fifty-fifty for a PNP BJT to be replaced with a P-channel MOSFET, you lot will demand to simply reverse the relevant supply polarities.
Compatible Pinout Replacement Diagram for PNP BJT with P-Channel MOSFET
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Source: https://www.homemade-circuits.com/how-to-replace-transistor-with-mosfet/
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