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hirochiamaru
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I have a data acquisition device that outputs 3 volts if the sensor is activated. My relay only activates when a 5 volt source is put across the coil. What is the easiest way to step up the 3 volt control signal.
hirochiamaru said:I have not tried a relay driver IC but the transistor method looks promising. I just have a couple questions.
I got the relay at radio shack.
http://www.radioshack.com/product/i...&sr=1&origkw=relay&kw=relay&parentPage=search
# Maximum switching current of 0.5 A
# Maximum initial contact resistance of 150m ohms
1. My data acquisition device can't supply more than 20ma at 3.2V. Can a 2n2222 NPN transistor work for the same circuit in
http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Relay-Interfacing.html"
2. How do you choose what kind of pull up resistor to use? would a 10k resistor be fine instead of a 4.7k?
Radio Shack said:Maximum switching power of 10 (watt/VA)
Maximum switching voltage of 60 VDC, 120VAC
Maximum switching current of 0.5 A
Maximum initial contact resistance of 150m ohms (150 milliOhms)
hirochiamaru said:Thanks, I have it working now. I used a 1k Ohm resistor between the logic drive input and the base of the NPN transistor as suggested and it works. I'm just wondering how you're supposed to choose what resistor to use on the base?(How did you know to use a 1k Ohm instead of the 4.7k Ohm.
On the back of the box of transistors i grabbed it has a section of Maximum rating:
Vce: 30V
Ic: 800mA
Power dissipation: 1.8W
How do you relate these ratings with the 1k Ohm resistor?
To convert a 3 Volt control signal to a 5 Volt control signal, you can use a voltage regulator or a level shifter. A voltage regulator will step up the voltage from 3 Volts to 5 Volts, while a level shifter will translate the signal to match the 5 Volt logic levels.
The purpose of converting a 3 Volt control signal to a 5 Volt control signal is to ensure compatibility between different devices or components. Some devices may only accept 5 Volt control signals, so converting a 3 Volt signal allows for proper communication and functionality.
You will need to convert a 3 Volt control signal to a 5 Volt control signal if the device or component you are trying to control only accepts 5 Volt signals. You can check the specifications or datasheet of the device to determine the required control signal voltage.
There are typically no major risks or limitations when converting a 3 Volt control signal to a 5 Volt control signal, as long as the conversion is done correctly. However, it is important to note that converting the voltage may introduce some noise or distortion to the signal, so it is important to choose the appropriate conversion method and make sure the signal remains within the acceptable range for the receiving device.
No, it is important to choose a voltage regulator or level shifter that is specifically designed for the task. Make sure to check the specifications of the device to ensure it is compatible with the voltage levels and signal type you are working with.