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D1, LED, T1-3/4, Red or Green or Other
LED for power-on indication, hole diameter: 0.711 mm (.028")
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1 |
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D2 or D3, LED, T1-3/4, Green or Red or Other
LED for discontinuity/continuity indication, hole diameter: 0.711 mm (.028")
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1 |
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R1, Resistor, Axial, ~1/4W, 50-1000 Ohm depending on power supply, LED
Current-limit resistor for D1
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2 |
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R2, R3, Resistor, Axial, ~1/4W, 470-20000 Ohm, noncritical value
Pullup resistors
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1 |
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R4, Resistor, Axial, ~1/4W, 50-1000 Ohm depending on power supply, LED
Current-limit resistor for D2/D3
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2 |
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S1, S2, Switch, Toggle, SPDT
Board hole diameter: 2.1 mm (.083"), pin spacing 4.7 mm (.185”)
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1 |
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U1, IC, ULN2003A, Darlington Transistor Array, DIP16 Package
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1 |
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O+/O-, Beeper/Buzzer, DC input compatible with power supply voltage
Board-mount pin spacing: 7.62 mm (.300"), hole diameter: 0.9 mm (.035")
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1 |
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I+/I-, Tester Inputs, Banana Plugs or Other
Remotely mounted -- wired to the PCB
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1 |
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V+/V-, Power Supply
5 V (3-12V), wired to the PCB
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