This circuit was found in Linear Technology Applications of 1997, using components of the time. The circuit transmits video signals bidirectionally over twisted pair.
In the figure we have the way to increase the current capacity of an operational amplifier. The...
This different circuit uses a relay as an oscillator, whose frequency is determined by C1, and to...
The circuit presented makes use of the LM340 and a power transistor that can be the 2N2955 or more...