audioguru Posted August 17, 2006 Report Share Posted August 17, 2006 i just wan to know the use which pin to connect to the pin Q and inverted Q of cd 4047?Sorry, I had the pin number of the clock for the CD4047 wrong. I fixed it.Connect the pin 13 and pin 10 to one gate of a CD4011 which drives the 1st Mosfet. Connect the pin 13 and pin 11 to another gate of the CD4011 and it drives the 2nd Mosfet.how about i add LM358 amplifier to increase the output current from the CD4047 in order to increase the efficiency?At only 50Hz or 60Hz, I don't think the switching speed makes any difference. If it was 50kHz or 500kHz then a lot of current is needed to charge and discharge the high gate capacitance of the Mosfets for them to switch quickly so they don't get hot. An LM358 is about the slowest opamp that is made, even slower than an old 741 opamp. It would be lousy for driving Mosfets. Quote Link to comment Share on other sites More sharing options...
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