This circuit powered by photovoltaic cells was found in the November 1998 issue of Electronics Now magazine. The circuit uses two motors and can follow a line thanks to its sensors.
We found this oscillator in a documentation for radio amateurs from the 1970s. The circuit can use...
Many oscilloscopes have high impedance inputs that make it difficult to observe high frequency signals...
This is the receiver for the previous circuit we found in the December 1992 Radio Electronics...