This 1975 tachometer for cars with platinum can serve as an idea for new projects. The components are from the era and a modern equivalent operational amplifier can be used.
This circuit was found in an ancient American documentation. The integrated circuit is of the time...
Found in an older Radio Craft, this circuit covers the aerial band from 118 to 136 MHz. No...
This amplifier was found in a Radio Electronics of the 90s. The circuit uses unusual operational...