microcontroller 12V relay circuit converted to 5V relay under uC control


Posted on Feb 5, 2014

The BC547B has Vcbo=50V, Vceo=45V, Vebo=6V, where-as the BC548 in original circuit has Vcbo=30V, Vceo=30V, Vebo=5V, rest of the parameters being pretty same as per datasheet (hFE:220-450). 1HP Water pump (220VAC, 800W) - One thought is to use higher current rated (e. g. 30A) relay. But, I think I need to worry about EM feedback which might cause arcing and destroy the EM relay.


microcontroller 12V relay circuit converted to 5V relay under uC control
Click here to download the full size of the above Circuit.

Q3) Right now I am making this on a veroboard (el-cheapo phenolic kinds). While I understand that this may be sufficient for the lamp/fan control, I am wondering if I need something better for higher loads, s. a. the Water-pump control What is the minimum gauge wire to be used for this purpose What kind of connectors (terminal blocks) could be used




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