Linear Power Supplies Linear Power
Supplies (often called Linear regulated Power Supplies)
are the term given to power supplies which convert AC mains power
into DC power but using traditional transformer technology rather
than the more recent and more common switched mode technology
which has become more popular with customers looking for lower
cost solutions. Linear power supplies, which have been manufactured
in various formats for over 50 years, are now generally been
considered less acceptable as they are often physically larger
and usually heavier and more expensive than their switched mode
counterparts, but an important factor is that Linear Power Supplies
don't emit high frequency "noise" to the same extent
as the switched mode units so offer an inherent benefit in certain
applications.  Zentro-Elektrik
in Germany are one of Europe's only remaining manufacturers of
Linear Power Supplies as many of the leading traditional Linear
Power Supply manufacturers have dropped their ranges due to reducing
demand and the gradual replacement by switched mode power supply
units. Zentro continue to manufacture these Linear Power Supplies
despite difficulties often experienced in the manufacture of
the integral transformers, for example there has recently been
a worldwide shortage of cold rolled grain oriented steel which
is the raw material used to produce the transformer laminations
resulting in lead times being extended. Sold via simplypowersupplies.com,
Zentro-Elektrik Linear Power Supplies remain amongst the most
reliable units on the market, and a first choice for many discerning
customers.
Linear power supplies are very quiet and are therefore often
the power supply of choice for applications of a sensitive nature,
or those where interference could be a problem, for example radio
transmission stations and similar applications. Linear Power
Supplies come in various mounting styles including; Encapsulated,
Open Frame, Chassis Mounting, Eurocard, Eurocasste, 19 inch Rack
Mounting, or laboratory (bench) style which are often used for
precise research and development applications. With a vast array of different output voltages available,
simplypowersupplies.com offer Linear Power Supplies from 25W up
to 1000W, and in output voltages from 1Vdc to 400Vdc. Should
the situation arise where a required voltage isn't shown within
ranges on the website or within the catalogue, simplypowersupplies.com
specialise in arranging for custom linear power supplies with
either single or multiple outputs to be designed and built into
either a standard or application specific case. What is also
possible is for larger power units to be produced from multiple
smaller units wired in parallel in order to obtain greater power.
In the Linear Laboratory Power Supplies this principle is often
used to easily produce the wide range of variants and power sizes.
A main incoming transformer will supply a number of linear regulation
cards which are connected together to produce a highly accurate
high power output. These laboratory linear power supplies also
offer the ability for the voltage and current to be controlled
remotely using 0-10Vdc analogue signals or via an additional
installed interface card they can be controlled via a PC using
GPIB/IEEE4888.2 or RS232 serial communications. 
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