LED Field Strength Meter - Component Identification

For the Field Strength Meter to work it is vital for the right components to be in the right place, and the right way round.

IC Socket Identification:-

1 off 18 Pin socket & 1 off 8 Pin socket.

Pin 1 is at the cut-out end of the socket.

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Resistor Identification:-

R1 = 220R Red - Red - Brown

R2 = 22k Red - Red - Orange

R3 = 4.7k Yellow - Violet - Red

R4 = 4.7k Yellow - Violet - Red

R5 = 3.9k Orange - White - Red

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Capacitor Identification:-

C1 = 10uF, 16VW

**(Make sure that the negative (-) lead is connected to the ground plane)**

C2 = 100pF

C3,C4,C5,C6 & C7 = 0.1uF (Either Blue or Yellow Case)

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Diode Identification:-

D2 & D3 = 1N4148

**(These 2 diodes are taped together- do not separate them until they are to be fitted into the PCB)**

**(Make sure that the diodes are the right way round. Cathode lead has a ring on the case)**

D4 = 1N4001

**(Make sure that the diode is the right way round. Cathode lead has a ring on the case)**

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Zener Identification:-

D1 = 5.1V Zener Clear glass diode that looks similar to D2 & D3.

**(Make sure that the diode is the right way round. Cathode lead has a ring on the case)**

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LED Identification:-

LED 1 = Green High Efficiency (Looks clear)

LEDs 9-10 = Red High Efficiency

**(LONGER lead (anode) goes to SQUARE PCB pad)**

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