Using a common crystal diode and a 741, this circuit can be used to detect microwaves. The circuit is from old documentation and the switch selects the gains.
This circuit from the 40's is a conventional analog multimeter with several scales. Its accuracy will...
The integrated circuit used in this project is no longer very common, but if found it can result in...
This switched regulator configuration was found in Motorola's 1969 documentation. The integrated...