Relay Driver - All About Circuits
Oct 17, 2020 · Hi: I have a 5 volt relay that requires 70mA of current in order to energize the coil. I am trying to get a driver to work using a 2N3904 transistor, a 1N4148 diode for the flywheel and a 1KΩ resistor on the base. The emitter is grounded. I …
CAN Bus Relay Driver - All About Circuits
Apr 30, 2020 · The relay driver will have five outputs and each output will provide +12V for controlling a single relay. Each relay in the fuse box will also have a button wired in parallel with the relay driver allowing an override in the event of an issue.
FET as relay driver not working - All About Circuits
Nov 21, 2009 · Rotational Magnetic Field Driver for Three Reed Relay Coils: Analog & Mixed-Signal Design: 6: Sep 12, 2023: I: Getting electric shock from relay driver: General Electronics Chat: 22: Feb 23, 2022: T: 12 volt relay driver curcuit: Analog & Mixed-Signal Design: 8: Sep 30, 2021: F: Relay Driver Circuit: General Electronics Chat: 18: Mar 16, 2021 ...
PWM for efficient relay circuit: some questions!
Nov 27, 2016 · Seems like I recall a simple circuit to allow full voltage for relay pull-in and a reduced voltage for hold. It consisted of a parallel resistor and electrolytic capacitor placed in series with the relay coil. When power is applied that capacitor appears as a dead short across the resistor, giving full voltage to the relay.
2n2222 for relay switching - All About Circuits
Jun 22, 2014 · With the transistor saturated, you should have a voltage at the collector of ~0.3V, meaning that the relay should get 5V-0.3V= 4.7V. An logic-level NFET would be a better choice for a relay driver. Last edited: Jun 22, 2014
555 timer Relay driver with TTL input | All About Circuits
May 22, 2020 · I wish to drive a 12v relay off a 555 timer after being triggered by a 12v PIR sensor. The sensor has a 3.3V TTL output which goes HI when the sensor is triggered. Once the sensor turns off the TTL output returns to 0V.-I want the Relay to turn on for 3 minutes (can be adjustable) after being triggered.
Relay Driver Circuit - All About Circuits
Mar 16, 2021 · Rotational Magnetic Field Driver for Three Reed Relay Coils: Analog & Mixed-Signal Design: 6: Sep 12, 2023: I: Getting electric shock from relay driver: General Electronics Chat: 22: Feb 23, 2022: T: 12 volt relay driver curcuit: Analog & Mixed-Signal Design: 8: Sep 30, 2021: J: Watchdog relay driver chip or circuit: Digital Design: 7: Sep 6 ...
LED driver circuit - All About Circuits
Oct 9, 2024 · The second relay box is for a V8 engine so the 4.2l engine is, apparently, a replacement. As for sequencing the LED's to limit power consumption I do not have access to the separate circuit boards without making a hole or holes in the cast aluminum housing to run wiring into the fixture and timers are not really the kind of sequencing I was considering. The circuit I …
Need a transistor for driving a relay? | All About Circuits
Apr 8, 2022 · So for you relay application: Maximum current: 20mA Maximum voltage: 5.7V (5V supply + the forward voltage of the back-EMF catching diode across the relay coil) Power dissipation: P = I*V so 20mA x 0.65V (the ON-state voltage) = 13mW So, looking at a 2N2222A (for example) the data sheet says:
Relay Driver help for Automotive HVAC app | All About Circuits
Apr 13, 2011 · Rotational Magnetic Field Driver for Three Reed Relay Coils: Analog & Mixed-Signal Design: 6: Sep 12, 2023: I: Getting electric shock from relay driver: General Electronics Chat: 22: Feb 23, 2022: T: 12 volt relay driver curcuit: Analog & Mixed-Signal Design: 8: Sep 30, 2021: F: Relay Driver Circuit: General Electronics Chat: 18: Mar 16, 2021 ...