Efficient small relays for High-Risk Applications
Reliable small relays Designs for Commercial and Industrial Applications
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Raising the voltage or using the very small input I have to trigger a greater flow would be great. And is there a simpler way to increase voltage or make a transistor switch than learning about transistor biasing and stuff like that? Ideally I want the fewest number of extra pieces I need to add to the circuit.
And got the following answer:
You need a power source with enough voltage to operate the relay, either a battery or a plugin power supply. You can find lots of relays that operate at 6 or 12 volts. If your input is at least a volt or so, you can use it to turn on a transistor, and the transistor can turn on the relay. There is not a lot of theory involved, just Ohm's law calculations. The input would go through a resistor to the base and emitter of the transistor, and the power supply would go through the relay to the collector and emitter. Positive to collector for an NPN transistor, negative for a PNP. It's a good idea to put a diode across the relay (in the direction that it doesn't normally conduct), so that it will absorb the voltage spike you get when the relay turns off. The relay will require somewhere around 50 to 100 milliamps to turn on, so if the transistor has a gain of about 100, you only need about 1 milliamp from your input. You can make the input resistor fairly high, possibly 5,000 to 10,000 ohms, so that you won't load down the input very much.
The small relays operate really nicely with unique applications that happen to be precise to power distribution and protection. The relays include wide adjustment ranges using a scale that is simple to read either in 3 or 4 digits as outlined by the model. These small relays support in escalating the flexibility of the applications, reduce the all round power and maintenance fees. There are actually relays which are utilized for common purposes which are available in trustworthy designs with swift replacement options. And you will discover models which might be utilised for industrial applications and heavier duty applications that operate on significant loads. These merchandise are made to meet the lifetime industrial manage wants of your applications.
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