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Independent Power Supply for (9 Volt) Digital Panel Meters CX101A
1 1
+9VDC
To digital meters
Bridge rect.
LED
~ V+ and V-
+
L2
9 Volt
+
12 vac
_
_
120 VAC
|
_
+
12 vac 1000uF 820
_
~
To Meter 1 To Meter 2
12 V. Relay
9 Volt
+
_|
+
To Power
2 1 Ohm/25 Watt 2
supply
Red
V in +
To binding
Power
V in +
V in -
supply out
Volt meter posts
Amp meter
V in -
Black
The CX101 digital panel meters will not operate from the same
voltage they are measuring. They need an independent power
source. Used together in this circuit they did not operate properly
3 3
from the same independene power source. Therefore, I used a 9 volt
battery for each meter and switched them on with a relay. The
laj 2011
relay would not be needed if a 3PST switch is used to turn the main
power supply and the 2 meter power source circuits on.
The Volt meter and the Amp meter are both CX101A digital volt
meters. For volts the meter is set for 200 volt max and for the
amps the meter is set for 20 volt max (across the 1 Ohm resistor).
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