The operational amplifier of this circuit can be the 741. The circuit has very low consumption and can be powered by two 9-B batteries. Low voltage amplifiers can be used.
The filter shown in the figure, suggested by National Semiconductor, only allows frequencies above...
This high sensitivity sensor was found in a 1967 General Electric SCR manual. The circuit admits...
With this circuit it is possible to use the same antenna to receive signals from conventional...