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Guide By:
hmale
Review Date: 12/12/02 |
Many of us are familiar with the concept of using a relay to automatically
power on a peripheral device e.g. pump, fan, or other A/C powered
component. While there are many companies that will provide a tailored
solution that will accomplish this, their devices are usually expensive
and limited to powering only one component. The
following guide will allow the user to power on multiple peripherals in a
cost effective manner.
To put it in the simplest of terms, a relay acts as a switch. Relays
typically have a D/C voltage side and an A/C voltage side. When a D/C
voltage is applied to the relay, the A/C side is activated and power is
applied to the components connected to its circuit. Relays are rated in
terms of volts and amps. When choosing a relay, the average user will
observe that the relay is rated for 12 V operation; to match the power
supply's output. The current rating refers to the maximum amps that
the relay can safely manage. It is important to ensure that the sum of the
current requirements of the components that will be connected to your
circuit be less than the relay's current rating, in amps.
In order to power multiple peripherals, we will be using a multi-outlet
surge protector. The following wiring diagram illustrates how the relay
and surge protector will be connected.
The parts that we chose for this guide are
as follows:
| Part Description |
Radio Shack Part# |
Crimp on Quick
Disconnects
DPDT Plug-in Relay (rated at:12V/10 Amp)
2' length each of red and black 18 gauge wire
Crimp on Telephone/Alarm Connectors
4" X 2" X 1" Project Enclosure
Surge Protector of Choice |
64-3134
275-218
N/A
64-3057
270-1802
N/A |
The parts and tools we used are pictured
below:
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