DIY Doorbell With 555 Timer + UM66T Chip

The 555 timer ic and the UM66T are a perfect couple! Not only is this circuit great for beginners, but can actually be used in daily life. As a real functioning doorbell! The doorbell is running on standard AA batteries but all of the components can be purchased for less then $7.00!

Step 1: Making This Circuit on a Breadboard!

This circuit is very simple to build on a breadboard. You will need the following components though:

1x 555 Timer IC
1x UM66T 19L
1x BC548 Transistor
1x Tactile Momentary Switch
1x10K OHM Resistor
1x 18K OHM Resistor
1x 100 OHM Resistor
1x 1000uF Capacitor
1x 4.5V AA Battery Pack
1x 0.5W 18OHM Speaker
1x Breadboard

Follow the schematic diagram attached!

Step 2: PCB Circuit

Using Fritzing I turned my breadboard design into a PCB layout! I then proceeded to download my GERBER files and went to https://jlcpcb.com and 10 boards cost me only $2.00!!!! The Boards only took 48Hours to make then they were shipped!

Step 3: Receiving the PCB's

Within 5 days my PCB's arrived! I inspected each individual PCB's and they all looked great! Very impressed!

Step 4: Soldering!

I soldered all of the necessary components to the PCB board! starting with the biggest components and then finishing with the external components! When i connected power and pressed the button, The circuit worked!