Door Bell circuit using UM 66 IC
Description
Here is a simple and east to build doorbell circuit using IC UM 66.The details of UM 66 is given in the older post “Melody Generator using UM 66″. This is a slight modification of that circuit.In the previous circuit you have to keep the switch pressed for making the IC play the full music.Here if once the push button is pressed C1 is charged and the transistor Q2 will keep the IC playing the music till it ends.The time for the IC to play depends on discharging time of C1 which can be set by R1.Set R1 to select your time ,whether full tone or a part in one press.Transistor Q2 drives the speaker.
Circuit Diagram with Parts List
Notes
- Do not give more than 4.5 V to UM 66.
- POT R2 is not necessary and can be bye passed .But if included you can set the loudness.
Good Info , thanks for sharing..!
this circuit has very low sound…!
\do have any solution
have you adjusted the potentiometer R2??
door bell
i feel there must be description over the diagram for better understanding. if it is their i didn’t find.
I am building a doorbell for deaf people.A device will be tied to the deaf person’s hands…When the doorbell rings the device should vibrate so that the person knows somone is ringing the bell .Could u tell me a solution for this
I can’t find UM66 in Singapore. I’d appreciate your recommendation of an equivalent chip that can simply replace it in the same circuit. Thanks in advance.
HOW DO I WIRE THIS BELL SYSTEM. “A” BELL “AB” BELL “BC”BELL “A” PUSHBUTTON “AB” PUSHBUTTON “BC” PUSHBUTTON ONE MASTER PUSH BUTTON WHEN PRESSED TO RING ALL THREE BELLS.
am to get a project for my final year. i need a suggestion of what kind of project i can make am studying a diploma in Telecommunicatiun Engineering can anyone help pliz
I need some explanation of the circuit. As far as I know the output of the IC UM66 is from 3rd pin but it is taken from 1st pin. So pls provide some explanation. Pls…
Hi Nishanth you are right Pin no1 common, 2 supply and 3 output.
http://pdfdata.datasheetsite.com/web/24921/UM66T.pdf
This IC is a basic CMOS ROM with built in melody, which is prefixed and cannor be changed.