Vectronics VEC-1500K - Manual (Page 19)

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Transformer Powered Soldering Station: Transformer-powered soldering
irons run on low voltage. Typically, a transformer unit enclosed in a separate
bench-top control box converts 110-volts to 24 volts. Irons plug into a socket on
the front panel of the box, allowing for rapid substitutions. Virtually all
transformer-powered stations use three-wire AC cords and provide grounded
iron tips. Grounded tips bleed off electro-static discharge (ESD) that might
otherwise build up on the iron and damage sensitive electronic parts during
construction.
Two kinds of temperature control are popular, depending on the solder station's
model and manufacturer. One method uses magnetic-thermostat switching with
a temperature-sensitive element built into the iron's tip. The type of tip you
install controls temperature. The classic "Weller Soldering Station", an industry
mainstay for over 30 years, uses the magnetic thermostat design.
Other soldering stations use an electronic thermostat that provides continuously
adjustable temperature control. All thermostatically-controlled irons apply
element power on demand to maintain a more constant tip temperature. This is
an important feature not found on lower-cost unregulated irons.
TEMP
PWR
ON
800
700
600
Transformer Unit
Thermostat Control
Mini-Irons: With the advent of surface-mount technology and increased
miniaturization, a smaller version of the conventional soldering iron has gained
popularity. Light-weight "mini-irons" (or soldering pencils) outfitted with ultra-
fine tips reach into tight spots where other irons can't reach. Mini-irons are
available in both unregulated and thermostatically-controlled models.
Min-Iron
Alternative Soldering Irons: For field work or quick bench jobs, many people
prefer to use a "no-plug-in, fast heat" alternative to the traditional iron. The
most common energy sources for these irons include internal rechargeable NiCd
batteries and liquid butane fuel. Portable types may not deliver the power and