The circuit shown in the figure is from a time base that generates 60 Hz rectangular signals.
This small FM transmitter can be powered by solar cells in the range of 1.2 V to 6 V. Its range...
Found in a Hands On Electronics of the 80s, this circuit makes use of an integrated circuit of the time...
When the input voltage exceeds the value set in R4, the LED lights up, indicating this. The...