555 Timer Tester v1.0

Simple circuit for testing a 555 timer IC

Melvin van Kalsbeek

Following Follow project

Liked Like project

Become a Hackaday.io member

Just one more thing

To make the experience fit your profile, pick a username and tell us what interests you.

OK, I'm done! Skip

Public Chat

Similar projects worth following

View Gallery

Public Chat

Description

This is a simple circuit and PCB design for testing a 555 timer IC by blinking an LED. It is set up in astable mode with a known frequency of 0.48HZ with 1.386s time HIGH output and 0.693s LOW output. The circuit is designed for 9V input.

The circuit can be improved upon, but this is a fully functional first version.

Details

Specifications

Parameter	Value
Input Voltage	9V DC
Frequency	0.48 Hz
Duty Cycle	66.67 %
Time HIGH	1.388 s
Time LOW	0.694 s

Used Resources

Description	Link
555 Timer Astable Oscillator Calculator	https://www.allaboutcircuits.com/tools/555-timer-astable-circuit/
Methods for reverse polarity protection	https://www.edn.com/protecting-against-reverse-polarity-methods-examined-part-1/

Future improvements

Input voltage range testing
PCB redesign with holes for screw/standoff mounting
PCB redesign with horizontal C1 capacitor to allow for enclosure mounting

Files

555 Tester v1.0.zip

KiCad project files (schematic and pcb design) for the 555 Tester v1.0

x-zip-compressed - 33.64 kB - 04/14/2024 at 10:06

Download

Components

1 × J1 DC Barrel Jack Connector DC Barrel Jack connector for a 9V adapter (positive terminal center)
1 × U1 DIP-8 IC Socket Socket for a NE555P timer IC
1 × C1 100uF Electrolytic Capacitor Charge/discharge capacitor for the astable configuration of the 555 timer
2 × R1, R2 10 kΩ resistor Resistors for triggering and discharging in the astable configuration of the 555 timer
1 × R3 470 Ω resistor Current limiting resistor for the LED