Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz. The input impedance is in the order of 1 M ohm.
This circuit can be powered from 4 to 12 V sources. Pin 6 is the positive supply. See more about...
In the figure we have the configuration of a logic switch with the TTL 7400 circuit. The...
The circuit shown in the figure consists of a low voltage drop (LDO) regulator for 200 mA using the...