This filter, with a cut-off frequency of approximately 1 kHz, has a high Q and employs two operational ones. The power supply must be symmetrical.
This simple signal injector oscillator was found in a 1981 documentation. The coil can be made...
September 2017 - Würth Elektronik High Power Ultraviolet LEDs can be obtained from Mouser...
This circuit works as a variable transformer that measures the power applied to a 110 V load (and...