This circuit was found in the May 1984 issue of Radio Electronics magazine. It analyzes the exhaust gases emitted by a car. The circuit uses a special gas sensor from that time.
We can obtain the voltage multiplication using all six inverters of a 4049 integrated circuit, as...
Using the LM358 from Texas Instruments, this circuit uses LED indicators and can be powered with...
This preamplifier is recommended by Sanyo and uses its LA3160 integrated circuit as a base. The...