Found in a 1980s documentation, this amplifier uses an integrated circuit that is not easy to obtain now as it is of the era. The circuit is intended for FI ceramic filter circuits.
This circuit converts pulse frequency to current, which is indicated on an analog instrument. The...
Found in an Electronic Engineering from the 80's, this circuit makes use of components of the...
With the configuration shown in the figure, a common 12 V lamp lights up when light no longer...