By Composite Design
The Composite
Design Lamp Test Circuit Assembly provides an easy means to test up to ten lamp/annunciator circuits.
As the hub of annunciator circuitry, it is
connected in-line between the warning switches & senders found in most aircraft
and helps to organize the wiring by centralizing connections to and from the board.
Functions can be marked on the white
tabs by each terminal.
The circuit is
programmable such that there is a setup switch for each channel. These switches are set according
to the
type of sender used for each channel so that when the unit is activated
it will provide the proper stimulus to the lamp or
annunciator
being used.
Both LED's and small incandescent lamps can be used with the assembly.
Each channel has an integral current limiting
resistor for LED use which can be easily bypassed if lamps are used.
This circuit consumes NO current when in normal
operating (non test) mode.
Some examples:
* A 'PUMP ON' lamp, connected to an electric
fuel pump, will light when
power is on to the
fuel pump & other end of the lamp is to ground.
The switch for that
channel will be set to SENDER TYPE = HI
* A 'LOW OIL PRESSURE' lamp usually has
one end connected to +12V and
is turned on when
the sender on the engine provides a GROUND path...
The switch for that
channel would be set to SENDER TYPE = LO
The power required when in test mode is
less that 1/4 Amp, not including power for the lamps or annunciators. Each
channel
can handle a load of 1/5 Amp, or about 2 Watts maximum!
Each channel is wired
with ~330 ohm series resistor for driving LED's. If a lamp or other type of annunciator
is to be used,
short that resistor with a short length of solid wire
soldered into the extra pads that are found by the end of each resistor.
Dimensions: 5.6"L x 4.0"W x 1"H
Price:
$150 ($160
for 28 Volt System). International Shipping Available,
6% Sales Tax For Units Shipped Within The State
Of Florida.
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