Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The circuit uses a rectifying bridge that can be replaced by 4 common diodes.
We found this circuit in a Texas Instruments application manual. The circuit provides a...
We present a comparator with signal resolution in the submicrovolt range. The matched pair of...
Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output...