This circuit for the 60 kHz range was found in 73 magazine and published in 1995. The circuit uses a ferrite rod. Note the direction of the coil windings.
We found this circuit in the magazine Eletcronics Now of July 1994. The power supply is according to...
This circuit uses the 7815 regulator to obtain a voltage for motor control num shield for PC. The...
This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is...