This simple circuit to monitor the frequency of the power grid uses an analog indicator. The adjustment trimpot can be 4k7 and the indicator is 100 mA full scale.
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...