1. Detect logic signal input When there is no logic signal input, LED2 emits yellow light, and when there is a logic level signal, LED2 does not emit light. 2. Determine the type of logic signal If it is the high logic level of the input, LED1 lights red, if it is the low logic level, LED3 lights green.
PCB mark
Name
Package
Quantity
R10-R13
2k resistor
0805
4
R1
10k resistor
0805
1
R2
10M resistor
0805
1
R3, R9
4.7M resistor
0805
2
R5
18K resistor
0805
1
R6
6.8K resistor
0805
1
R4
27K resistor
0805
1
R8
1M resistor
0805
1
R7
1.5M resistor
0805
1
C1
101 capacitor
0805
1
Ca, Cb, Cc, Cd
103 capacitor
0805
4
LED0, LED1
red LED
0805
2
LED2
yellow LED
0805
1
LED3
green LED
0805
1
J1
Power port
1
IC1
LM324
SOP-14
1
VD1-VD4
IN4148 Diode
4
Package included:
1 x Logic Level Tester Electronic DIY Kit
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