Recently doing a 5 v level control ten ErFu voltage on off problem, first take two triode to do a transfer failed, finally intends to use the relay control, but I don't know how to drive, which a great god give a circuit diagram

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If it is with relay switch, then drive is very easy, now has a 5 v relay module directly with high and low level control is, why should use ULN2803? What also do not need circuit, just enter the discretion of the appropriate level of control can be achieved.

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Open leak to drive 7 relay ULN2803 collector? The positive can relay ULN2803 output and power supply,

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The relay input by the height control out of the high and low

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Is supposed to now of electronic components of the flexible, would not have made less than the triode switch!

CodePudding user response:

A single relay with triode ok, 5 v relay, use a triode can also, or use darlington tube, it is not necessary to use ULN2803A.

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To learn, driver amplifier

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reference 1/f, the wise know already should good karma response:

if it is to use relay switch, then the driver is very easy, now has a 5 v relay module directly with high and low level control is, why should use ULN2803? What also do not need circuit, just enter the discretion of the appropriate level of control can be achieved.

5 v relay drive current is not very big

CodePudding user response:

Just a 5 v relay ordinary triode literally dozens of ma can realize how difficult?
As a circuit designers, for a variety of devices and clear in mind, follow one's inclinations, with easy, a piece of cake, design a triode switch circuit what no good?
Design of light coupling can not achieve a total drive switch are common;
What's more, buy relay module designed the somebody else all the high input impedance, as long as the input in high and low level can control relay,
Of the 12 v power supply control take 1 or 2 triode transistor of darlington can control, is easy to realize, and not a total control,
Did not need any circuit, in the heart have figure: assuming a MCU IO mouth drive light coupling light ends, light coupling on the other side resistance will drive after darlington, both P and N type transistor can easily implement,

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Above can relay as load, also can be seen as a relay drivers,