Effective 12v relay 5 pin configuration for High-Risk Applications
Reliable 12v relay 5 pin configuration Designs for Industrial and Industrial Applications
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12v relay relay 5 pin configuration
- This will solve LED related turn signal problems such as rapid flashing, not flashing, or bulb burnt out warning on dashboard.
- The LED flasher does not replace all flasher relay. Before ordering, please make sure the 3-pin configuration is the same as your vehicle's.
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cool asked About Operational Amplifier?
Hi, I connected UA741 IC to the typical non inverting output config. The amplification seems to be fine. When I give an Input signal of 5 volts I get an out put of 14v. But the problem comes when I bring the input signal to zero the output doesnt fall to zero it remains at about 7 volts. Seems like the amplifier just adds another 7 volts to the input signal. But, according to the opamp equations ie., for the non-inverting configuration Vout=Vin(1+R1/R2) so theoretically when Vin =0 Vout should also become zero , but this doesnt happen. I need to connect the microcontroller output amplified by UA741 to control a 12 v relay , but since I cant get 0 o/p I am not able to control the relay. Please tell me why the Vout remains stuck to 7 volts instead of turning 0.
And got the following answer:
First of all, the last way you'd ever want to drive a relay that is being controlled from a microprocessor would be from an opamp. Only reason I could see is if you already had a dual or quad op amp package in your design with an extra amp that was unused. Even then, I would avoid using to drive a relay. Again, unless this is a specific classroom assignment to use the op amp as a relay driver just to learn from it, do not do it!.. Use the op amp when you need to amplify some kind of ac signal or need to get gain or a high impedance input for a measurement or instrumentation circuit, like an input stage for one of the analog inputs that you might find on a microcontroller. What you might be seeing is related to the output that you are driving the op amp with. Most logic outputs never go to zero volts, and you might even see somethong around 1.4 or more volts at the output. This output is probably whats driving the opamp to a higher than expected output when you have the logic ouput in the off state. Also, the 741 is designed to operate with both a positve and negative power supply. Do you have the neg supply pin connected to ground, or to a neg voltage supply?...If its connected to ground, you are seeing what I would expect, zero Volts in should indeed cause you to see half the supply voltage on the op amps output! There are several much easier and less expensive ways to drive a relay. Why not just drive the relay with a single transistor like a 2N3904 or something similar. You could also use an fet, or an opto isolator. Go to this link and you will see avery simple way to do this: http://www.wam.umd.edu/~toh/ElectroSim/relay.html Also, is there a particular reason you are using a 12V relay? There are plenty of relays out there that will drive directly from a microcontroller like one of the Microchip Pics. Most of those can drive 25 ma of current at the Vdd voltage. Another tip, if you drive a relay from a uC output or logic output. place a small diode like a 1n914 across the relay in the reverse bias , in other words cathode to the postive voltage side. This keeps the high voltage spike that a relay or inductor can produce when it turns off from damaging your drive circuit. Good luck!..and feel free to write directly for any suggestions or help.
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