This small amplifier with the fraction-watt LM4862 was found in the November 1999 issue of Electronics Now. The power supply is low voltage.
The frequency depends on the coil and is not found in the original documentation but should be...
This is a device for those who need to show that they know how to use digital electronics but have...
Using an operational amplifier with FET, this circuit from a 1977 publication can generate...