Choosing
the correct Mains Adaptor.
Many
pieces of portable battery powered equipment such as radios,
tape recorders cassette players, personal stereos, calculators
and electronics games offer the ability to be powered from
MAINS power.
There
are four things you need to know to replace your AC/DC Adaptor:
1)
Output Voltage and milli-Amps
2) Output Polarity
3) Regulated (Switching) or Un-Regulated (non-switching)
Output
4) Output plug size
1) Output Voltage and milli-Amps
Usually
the volts and milli-Amps (mA) are printed on the original
adaptor, and often also on the device that uses the adaptor.
Choose
a voltage equal or lower than required
Choose milli-Amps equal or higher than required
2) Output Polarity
This
applies only to adaptors that convert AC to DC. The AC to
DC adaptors will have a negative centre or a positive centre.
To determine the polarity of your adaptor look for a symbol
like this:
This
symbol shows a positive centre. The - and + signs would
be reversed for a negative centre. NEVER choose an adaptor
with the wrong polarity as this can damage the equipment.
AC
to AC adaptors do not have any polarity and so will not
have a polarity symbol.
3) Regulated (Switching) or Un-Regulated (non-switching)
Output
Most
AC adaptors are un-regulated, meaning that they do not have
any way to cause the output voltage to remain constant.
Most electronic equipment have internal circuitry to deal
with this.
Some
electronic equipment such as digital cameras or security
cameras are very sensitive to the input voltage and so require
a Regulated (otherwise known as switching) AC adaptor. A
regulated AC adaptor guarantees that the output voltage
will always be constant.
A
regulated adapter can be used in placed of an un-regulated
adaptor. However NEVER replace a regulated adaptor with
an un-regulated adaptor as this may damage the equipment.
4)
Output plug size
There
are hundreds of different applications that use mains adaptors
and you will note that there are a number of different output
plugs. We offer a range of universal adaptors each supplied
with a range of Jack Plugs that should fit most of the applications.
A plug size of 2.1 x 5.5mm means that the inner diameter
is 2.1mm and the outer diameter is 5.5mm.
Here
is a quick reference quide to which output plugs are supplied
with our universal adaptors:
Ansmann
products
Adaptors
with the product code beginning with AP are Ansmann product
and come supplied with 8 output connectors:
S:
Hollowplug - 0.75mm x 2.35mm x 10mm
J:
Hollowplug - 1.75mm x 4.75mm x10mm
H:
Hollowplug - 1.35mm x3.5mm x10mm
I:
Hollowplug - 1.7mm x 4mm x10mm
D:
Hollowplug - 2.1mm x 5mm x 12mm
G:
Hollowplug - 2.5mm x 5mm x 12mm
A:
Jackplug - 2.5mm x 13mm
B:
Jack plug - 3.5mm x 15mm
Uniross
Products
Uniross
product come with different sets of output connectors for
the different adaptors in their range, the various connectors
available are summerised below.
UO152693
and UO152747 ,
Measurements:
Internal Diameter x External Diameter x Length
