A circuit designed to generate and maintain a constant magnetic
flux is presented by using a sample-data control system, instead of a
continuous control system.
A Hall generator is used as the magnetic sensing element, and
is operated with a pulse bias to allow a large output. The output of...
It is often necessary in communication systems to detect very
small signals that are buried in noise. One device used to accomplish
this is a lock-in amplifier. Initially the theory of operation is considered.
Then the circuit design of a low cost lock-in amplifier is
given. The amplifier, employing linear...
In this paper the characteristics of multi-conductor transmission
lines have been investigated for a variety of termination conditions
by using the differential equations and matrix methods.
Equations showing the characteristics of traveling waves along loss-less
multi-conductor systems are derived.
Line parameters were evaluated by experiments and by calculations.
The results...