Components

CD40110 Counter/Display

Combined up/down counter with built-in 7-segment display driver used for the V1 speed count.

74LS192 Up/Down Counter

Synchronous BCD up/down counter that increases or decreases the speed count.

CD4029 Counter

CMOS presettable up/down counter used for the speed count in V3 and V6.

CD4511 Display Driver

BCD-to-7-segment latch/decoder/driver that drives the speed displays in V6.

7447 / 74LS47 Display Driver

BCD-to-7-segment decoder/driver for common-anode displays.

74LS90 Decade Counter

Classic decade counter cascaded for the two-digit display in the completed V7 system.

74LS85 4-bit Comparator

Compares the current speed with the selected set speed to trigger the cruise warning.

NE555 Timer

Astable oscillator that flashes the red warning LED when the cruise speed is reached.

LM35 Sensor

Analog sensor producing a voltage proportional to the simulated speed input in V4.

TC7107 Display IC

ADC and display driver converting the analog sensor voltage to a digital readout.

2N3904 Transistor

General-purpose NPN transistor used for LED driving and switching stages.

LEDs

Green (0–5), yellow (6–9), and flashing red (set speed reached) indication.

DIP Switch

4-bit set-speed input for the 74LS85 comparator in the completed V7 system.

Push Buttons

Manual count-up / count-down and reset inputs for the counter stages.

Resistors & Capacitors

Timing networks for the NE555, current limiting for LEDs, and debounce filtering.