This bargraph circuit is from an ancient American documentation. It indicates the charge state of a set of 4 batteries from 9.6 to 5.2 V.
The purpose of this circuit is to extend the range of frequency meters (typically up to 30 MHz) to...
This basic configuration of an astable multivibrator was found in a publication of the year 1968....
The frequency of TTL square signal is divide by 5 with this circuit. Power supply is 5 V and the...