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In standby mode (when the smps is ON)that sound is normal
It can be rectified if you can apply a signal to the shutdown pin while on standby Or put some minimum load always
Dear Kryptone
can we go systematic
There is some problem in your DC DC converter let us rectify that problem first before proceeding to H bridge
1 Disconnect the H bridge from circuit power on the DC DC converter and check output voltage
2 connect 180V 50w load and measure output DC voltage...
1) thermistor1 pulled up to 5V because maybe the other end of thermistor is grounded . so that they form a voltage divider
2) it is good to use capacitor in all the three circuits and has nothing to do with thermistor 1,2,3
3) The opamps are used as Buffer unity gain to prevent loading of the...
Series pass transistors Dissipate too much heat and efficiency is very poor. use top switch
Normally in top switch voltage feedback is used. Instead of that, sense the output current and give feedback and set the required current, also use a over voltage sense at the output to shut down the Top...
In that circuit regulated voltage is 50V so 36 plus 11 plus voltage drop in 4n25 LED makes near 50 and thus regulated. 510 ohm resistor is for current limiting to the LED portion of opto 4n25
If the file is in desktop you would have surely got it by doing as above in the search, I think the file is missing or corrupted. What was the OS on the laptop?
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