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




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

50 Watt Amplifier ICL8063
Radio Commercial Zapper Circuit
switching
Controlling DC Motors Robotics Tutorial
Frost Alarm
Atmel 89C2051 prototype board
FM Crystal Controlled Transmitter DPT
PPMC and stepping motor driver IC dedicated connection circuit
TDA6106Q having a feedback factor of the test circuit diagram 1 116



Top