This optically coupled circuit was found in the February 1968 Radio Electronics magazine. The circuit uses an LDR in modulation. Transistors are types of the time.
This circuit is from a 1979 publication. The sensor consists of plates or screens that, when...
This third-order Butterworth filter was found in American documentation from the 1980s. Formulas for...
The purpose of this circuit, which we found in the November 1986 Radio Electronics issue, is to...