This circuit was published in a recent magazine as a past project. It is a crystal radio from October 1986 Radio Electronics magazine. The article detailed the assembly.
The gain of the operational amplifier shown in the figure depends on the feedback resistor,...
June 2016 - It can be obtained from Mouser Electronics the new gate driver optocoupler from...
Figure shows the basic application of a data selector using the 4051 . The same configuration is...