A very high quality stereo FM transmitter circuit , thoroughly time tested ,highly reliable, crystal controlled PLL based for zero frequency drift is reviewed below. The main circuit uses a very popular IC -KT0803L ,to develop two channel stereo audio modulated FM signal from76 MHz to 108 MHz covering the FM band of 88 MHz …
Optocouplers are used mostly in power electronics circuits to isolate the fatal mains utility voltage to that of the low dc voltage that the control circuit works. Therefore some call it optoisolators. They find use in control circuits feeding Thyristors,MOSFETs,IGBTs. Submitted below an audio visual for better understanding.
Controlling AC power by delayed firing angle control is a very old and traditional method. Simple example is our electronic fan regulator. But this has one major drawback that it generates a lot of harmonics (62%THD)as compared to a chopper(2%THD). Presented below a chopper that is much more efficient. . Please watch the video