Description
This is a peripheral board with 4 relais, rated at 5A/250V each. The board has a ML10 output connector for connection with the AT2313 Project board. It has also 4 LED's for indication which LED is on.
Hardware
The circuit is simple, it consists of no more then an ML10 connector, a ULN2803A, which contains eight open collector darlington transistors, four of them amplifies the signals that come from the microcontroller. The IC has build in protection diodes, so no external diodes for driving the relais are needed. There are also foeur LED's with current limiting resistors to indicate if a relais is energized, each output of the relais goes to a 2-pole screw connector.
1 comment:
Why use relais? You'd be better off with opto-couplers and triacs.
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