This article is from the May 1958 issue
of "Radiotronics", the in-house publication of the AWV applications laboratory.
It gives a useful but condensed summary
of the design fundamentals of vibrator power supplies.
AWV (Amalgamated Wireless Valve) was the
valve making subsidary of AWA (Amalgamated Wireless Australasia).
[Note that Australian
made Oak vibrators (manufactured by AWA under their MSP brand) operate
at 100c/s. The reference to 115c/s is due to these notes
being based on
literature from the U.S. based Mallory company.]
[While the information
pertaining to the selection of timing capacitor is correct, there is more
to it. If it was merely a matter of arc suppression, the value of capacitor
would not be critical.
The timing capacitor
controls the rate of polarity reversal of the collapsing magnetic field
in the transformer, so that minimum current is flowing when the contacts
are opening and closing.
Maximum current
is timed to flow only when the contacts are actually closed. By this means,
not only is sparking prevented at the contacts, but so is contact material
transfer between the
contacts.]
Mallory Fundamentals of Vibrator Power Supply Design.
