
Circuit Diagram
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MHz lock LED colour switch board
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The
new circuit uses a 5mm tri-colour LED driven by a transistor switch.
When Q111 on the RF unit PB-1526A is turned on (unlocked) the red
LED is on. This turns on the first BC184L transistor, holding off
the second BC184L and the green LED. When Q111 is turned off
(locked), the red LED is off. This turns off the first transistor
switching on the second BC184L and the green LED. The new circuit is
built up on a small piece of plain matrix board and soldered into
position using two terminal pins. Before the 5mm tri-colour LED can
be fitted, an extra 1mm hole must be drilled in the PB-1390 PCB at
the position shown in the photo. |
Parts
List |
Component
Type |
Value |
Quantity |
Resistor |
470R 0.25W |
1 |
Resistor |
100k 0.25W |
2 |
Ceramic Capacitor |
0.1uF (104) 50V |
2 |
LED Red/Green |
5mm
tri-colour
LED Data pdf |
1 |
Transistor |
BC184L |
2 |
Circuit Board |
Plain Matrix Board |
1 |
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MHz lock LED board PB-1390 |
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