This circuit can be used to obtain a zener voltage from a common zener of another value, adjusting in a multimeter. The circuit is from an American documentation of the 1970s.
This simple standing waveform (ROE or SWR) meter is used to adjust antenna matching with...
The 4046 consists in a PLL with na internal oscillator controlled by voltage (VCO). Figure bellow...
This microtransmitter operates at a frequency between 3.5 MHz and 10 MHz determined by the...