Found in an Electronic Design from the 90s, this circuit measures the phase difference between two signals using an electronic multimeter. The circuit makes use of components of the time.
The bipolar transistors may be BD136 and BD136 and FET of any type for 1 A current at least. The...
This circuit was suggested by Sprague Electric in an 80's documentation. The circuit uses a...
This circuit appears elsewhere on this site, but from different sources. Using the LM3900, we find this...