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A typical relay switch circuit has the coil driven by a NPN transistor switch, TR1 as shown depending on the input voltage level. When the Base voltage of the transistor is zero (or negative), the transistor is cut-off and acts as an open switch.
NPN Relay Switch Circuit: A typical NPN relay switch circuit has the coil driven by a NPN transistor switch. When the Base voltage of the transistor is zero, the transistor will be in cut-off region and acts as an open switch.
8 Μαρ 2024 · Below is a relay wiring diagram that shows how to use a relay switch with an NPN transistor. This is useful for when you want to control a relay from things that can’t drive relays, like an Arduino, or an integrated circuit from the 4000 series or 7400 series.
Transistor switches can be used to switch and control lamps, relays or even motors. When using the bipolar transistor as a switch they must be either “fully-OFF” or “fully-ON”. Transistors that are fully “ON” are said to be in their Saturation region.
A relay switch circuit can be designed using NPN transistor.
You can do this with one transistor and a couple 10K resistors, as shown. The circuit will work with 0/3.3V input (anything from a bit over 1V to more than 10V is an acceptable '1', and < 200mV is '0'). simulate this circuit – Schematic created using CircuitLab.
2 Σεπ 2019 · 1. The trick is, when the transistor is "on" the diode will be reverse biased, so you can ignore it. A high voltage is applied at the base, this pulls the collector low as it allows current through the relay coil. Current through the relay coil activates the relay.
