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What else can I help you with?
Is there a transistor that turn on when there is no current on base and turn off when there is no current?
Yes, a transistor can be configured to operate in such a manner using a specific circuit design. A common example is a relay driver circuit with a normally closed relay, which can be designed to turn on without base current and turn off when base current is applied. Additionally, certain types of bistable multivibrator circuits can achieve similar functionality by utilizing feedback to maintain their state until an external signal is applied.
How do you interface a 4017 counter to a relay?
To interface a 4017 decade counter to a relay, connect the output pin of the 4017 (e.g., Q0 to Q9) to the base of a transistor, which will act as a switch. Use a resistor to limit the base current, and connect the transistor's collector to one terminal of the relay coil, while the other terminal connects to the power supply. Also, add a diode across the relay coil to protect against back EMF when the relay is de-energized. Finally, ensure the relay is rated for the load you intend to control.
How do you interface a relay to a microprocessor type 89C51?
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
What economical device - varistor - transistor etc can you use to supply power to a relay until the voltage drops to 10.5 volts?
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.
What is Si transistor?
A silicon transistor is a transistor made of silicon.
What is a driver transistor?
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
Is there a transistor that turn on when there is no current on base and turn off when there is no current?
Yes, a transistor can be configured to operate in such a manner using a specific circuit design. A common example is a relay driver circuit with a normally closed relay, which can be designed to turn on without base current and turn off when base current is applied. Additionally, certain types of bistable multivibrator circuits can achieve similar functionality by utilizing feedback to maintain their state until an external signal is applied.
How do you interface a 4017 counter to a relay?
To interface a 4017 decade counter to a relay, connect the output pin of the 4017 (e.g., Q0 to Q9) to the base of a transistor, which will act as a switch. Use a resistor to limit the base current, and connect the transistor's collector to one terminal of the relay coil, while the other terminal connects to the power supply. Also, add a diode across the relay coil to protect against back EMF when the relay is de-energized. Finally, ensure the relay is rated for the load you intend to control.
When using an arduino controlling a relay- why are resistors used with the transistor to activate the relay coil?
Because without the resistor, there would be a short from the base to ground, and sometihng would smoke.
Where is the fuel pump relay located for a 1992 corvette?
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
How do you troubleshoot an un-triggered or locked status LED on a legacy DS3800NHVM High Voltage Board when its corresponding isolation relays fail to actuate?
The DS3800NHVM Low-Horsepower High-Voltage Board uses localized status LEDs to give field technicians visual confirmation that specific high-voltage loops are energized and that the logic commands are reaching the board. When an isolation relay fails to actuate and its status LED stays locked or un-triggered, you must trace the breakdown between the low-voltage logic side and the high-voltage load side. Troubleshooting Strategy: Check the Driver Transistor Circuit: Each relay on the DS3800NHVM is driven by a localized transistor that amplifies the low-voltage control signal coming from the main rack. Using an oscilloscope or digital multimeter, check the base voltage of the driver transistor. If the logic signal arrives at the transistor but the transistor fails to saturate, it cannot complete the path to ground to switch the relay coil. Measure Relay Coil Continuity: If the logic driver circuit drops low (completing the path to ground), measure the voltage directly across the relay coil pins. If nominal activation voltage is present but the relay remains open, the coil winding inside the relay has failed open. Isolate the Status LED Loop: The status LEDs on these legacy cards are typically wired in series or parallel with a current-limiting resistor directly across the coil path. If the relay switches mechanically but the LED stays dark, the LED itself has burned out or the current-limiting resistor has cracked due to thermal fatigue. If the LED is locked on but the relay never fires, the driving transistor has likely failed in a permanent shorted state. Out-of-production systems like the GE Mark IV require deep bench expertise to repair and support. World of Controls features specialized testing rigs specifically engineered to simulate legacy Speedtronic logic environments. WOC tests every single component on the DS3800NHVM high-voltage board—from individual resistors and transistors to the mechanical relays—ensuring your classic turbine controls respond flawlessly to every command.
Where is the horn relay located on a 1993 Silverado?
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
Name the device that receives a signal and retransmit it at a higher level of higher power?
A relay or repeater. EDIT: The bipolar junction transistor
How do you interface a relay to a microprocessor type 89C51?
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
What economical device - varistor - transistor etc can you use to supply power to a relay until the voltage drops to 10.5 volts?
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.
How many flasher relay's do you need for full function in a 1979 camaro?
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.
Where is the flasher on the 1985 Toyota pickup?
Flasher Relay is located Front seating area, driver side, under dash, driver side of steering column, mounted in relay bracket.
