sakbd.2010 Posted October 28, 2010 Report Share Posted October 28, 2010 Hi,Power line fluctuation is very common in my country, so was looking to build a Hi/low cutoff circuit for my power inverter which do not have one.I hv found this circuit that looks nice,http://www.free-circuits.com/circuits/power-supplies/221/high-and-low-voltage-cut-off-with-time-delayorhttp://www.elecpod.com/powerinverter/2010/06243261.htmlI hv built some circuit before and can breadboard one if needed. But the one I'm interested in uses LM741 op-amp, but I got one LM393(comparator) available with me, so can someone please help me convert above circuit to use LM393(Comparator) Instead of LM741 op-amp.I have already got the linear supply as was in above circuit detail. I was hoping to simplify the circuit with a single ic LM393 Instead of two 741's.Also, I cannot find SL100 NPN transistor, But got some 2n2222a and BC547's, will they work instead of sl100 ?Please help me build this circuit, as I need the inverter and hi/low protection for it, in fact writing this without line power i.e. backup power from the inverter.My power line 230VAC 50 HzI have got one more question, How to protect the power supply circuit and transformer when the power line goes beyond 270(some times it does) any ideas ?? .... Quote Link to comment Share on other sites More sharing options...
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