We found this circuit in a 1973 publication. The circuit lets frequencies below 480 kHz pass through with an output impedance of 1k. The circuit can be implemented with current operational.
This circuit was obtained in an Argentine publication in 1976. It consists of a series voltage...
This circuit uses a small photocell to trigger an auxiliary flash. The circuit is from a 1991 PE...
We can obtain the voltage multiplication using all six inverters of a 4049 integrated circuit, as...