The FETs of this circuit can be the BF245. The circuit is from an old documentation and can be used in the amplification of infrasonic waves, of a sonic attack, for example.
Using a new Maxim integrated circuit (www.maxim-ic.com) the amplifier shown in the figure can be...
This modulator can be used in a data link or other signals up to 200 kHz. Range can be achieced...
Found in a 90s 73 magazine, this circuit uses an unusual component today which is the XR2206. |...