This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two...
Avago Technologies (www.avago.com) suggests the circuit in Figure 9 for amplifying signals of...
This circuit can be used as a buzzer from 3 different locations, allowing you to identify where it went...