Four-lamp bar display
Source: InternetPublisher:fbBYFnDne Keywords: monitor Updated: 2025/12/05
Circuit diagram:
Component:
R1_____________500K 1/2W Fine-tuning ceramic or carbon film resistor
R2______________47K 1/4W resistor
R3, R5, R7, R9 ______ 4.7K 1/4W resistors
R4, R6, R8, R10 ___ 470R 1/4W resistors
C1_______________1µF 63V Polyester or electrolytic capacitor
C2_____________220µF 25V electrolytic capacitor
D1-D4__________Yellow Super Bright LED
Q1, Q2, Q3, Q4 ___ BC337 45V 800mA NPN transistor
IC1____________7555 or TS555CN or TLC555CP CMOS timer integrated circuit
IC2____________4017 is a decimal counter integrated circuit with 10 decoded outputs.
IC3, IC4________4013 Dual D-type flip-flops
SW1____________Single-pole single-throw switch, suitable for any type of vehicle.
Battery_________12V vehicle battery
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