a transistor circuit for driving the coil of a magnetic relay.
you cannot directly interface a relay to a microcontroller, you need a buffer circuit in between the two, you can use a NPN transistor BC 547, connect the controller pin directly to the base of the transistor (since there is an internal 10k pull up resistor inside the controller no need of any base resistor). Connect the transistors emitter to the gnd & the collector to the relay coil, the another end of the relay coil goes to the supply, check this link for complete information http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Relay-Interfacing.html
A zener diode, a transistor, a rectifier diode, and a few resistors. A 10.5V zener diode will conduct until the voltage across it drops to below 10.5. If the relay is small enough, a zener diode is all you need. However, more than likely the current draw of the coil would burn the zener out. Use the zener to drive a transistor, and use the transistor to trigger the relay. V+ | |_______________________ | | _|_| _____|___ |/ \ 10.5V | | /___\ | 3 Relay | __|__ 3 Coil | / \ 3 0---------- /___\ 3 | | | 3 \ \ 4.7K | | / 2.2K / |____ ___| \ \ | / / | | | B | / C | |________|/ | |\ 2N2222 | | \ | | E |______________________| | _|_ \\\ When the voltage is above 10.5V the zener will conduct ant turn on the transistor. The transistor will power the relay. When the voltage drops below 10.5V the zener will stop conducting, shutting off the relay. The rectifier diode absorbs transients caused by the field breakdown in the coil, protecting the transistor. Just a plain resistor will do it or you may follows suggestion and use a computer to do that. The last time i used those ancient devices i find out they operate as a current device like minimum pull in current source. So a passive resistor in series will insure the minimum pull in source however it could be higher then the 10.5 v you need.The above designi just plain silly.
A silicon transistor is a transistor made of silicon.
Similar to a 2N3906 PNP transistor
I believe that is resistor transistor technology TTL transistor transistor logic
dirver transistor is added in a circuit so as to provide required voltage at an operating current which can not be provided by the microcontroller
Because without the resistor, there would be a short from the base to ground, and sometihng would smoke.
Primary Relay is located: Seating area, center, behind dash, driver side of stereo receiver, mounted in relay block. Secondary Relay is located: Seating area, driver side, behind dash, driver side of steering column, above lower dash panel, mounted in relay block
Front seating area, driver side, behind dash, driver side of steering column, mounted in relay block . To the right of the flasher, If you pull that relay and check the diagram on the relay you can shoot power directly to the horn from the hot side of relay terminal
A relay or repeater. EDIT: The bipolar junction transistor
UNDER THE DRIVER SEAT
the Fuel pump relay is inside the driver's front wheelwell to the right
The starter relay is on the driver's side fender behind the battery.
the relay fuses are in the engine compartment on driver side with the mini fuses
Flasher Relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in relay bracket.
Front seating area, driver side, behind dash, driver side of steering column, mounted in relay block
It has 2. The turn signal flasher relay and the Hazard flasher relay. Hazard signal flasher relay is located: Front seating area, driver side, driver side of steering column, under dash, mounted in upper left corner of fuse panel. Turn signal relay is located: Front seating area, driver side, driver side of steering column, behind dash, mounted on lower right corner of fuse block.