A PLL system can be used to implement an FM demodulator. When a PLL is locked on an FM signal, the VCO tracks the instantaneous frequency of that signal. Since the VCO output tracks the FM signal, and the VCO input voltage is proportional to the VCO output frequency, then the VCO input will be [...]
This instrument is very useful for radio frequency (rf) engineer and hobbyist, especially when he/she has to adjust the final rf transmission. Setting up an antenna impedance matcher is one of the example. Here is the schematic diagram of this rf meter circuit: The circuit use only one transistor (MPSA18) as the active component. The [...]
LM 2576 is a simple high efficiency step-down (buck) regulator. The function of this circuit is similar with Simple regulator circuit using LM7805, but with more regulator features and output current up to 3A. The features of LM2576 are wide input voltage range, output voltage 5VDC high output current (up to 3A), only requires 4 [...]
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