Found in a 1990 Hobbyst Handbook this circuit has an output power of a few tens of watts and serves as reinforced for the car's sound. The speaker can be 2 or 4 ohm.
Found in an American amateur radio documentation by the name of “antennascope” this circuit is...
This circuit was obtained from a 2005 Linear Technology manual. It is based on company components...
This circuit is from a 1968 publication. Here we have several types of resistive sensors with...