This circuit is a standard way of driving Small Power Relays
from Control Signals generated by Logic or Opamp Circuits.
and Automation - 02
C2 and R5 form a snubber which improves the life of the metal contacts, the contacts can erode due to sparking when switching inductive or even big loads. reduces EMI_RFI.
of Switches in Electronics
The Electromagnetic Solenoid Coil is rated by Volts and Ohms. If you choose 12V ensure a stable 12V is provided, more voltage will heat coil, less voltage will cause sparking or will drop out the magnetic holding.
A high coil resistance is better as the heat will be less and
power consumption of your design is low.
R3 and C1 is a dampener for the signal so that quick relay
operations can be avoided, this is important if your relay is
driving a three phase contactor which runs a huge Motor. C1 can
be increased if required.
20th May 2020
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