Birdie electronic Doorbell ringer (one transistor)

Posted by Ilias-Man On Monday, February 6, 2012 5 comments
This circuit is an electronic bell, it produce a tone like a real bird, useful as a doorbell, alarm, or between two rooms, floors like i did.



_ P1 is of experimental value. Start with 220 Ohms or so and modify to suit your needs, you can also change C3,C4,C5 to get more different tones, The transistor is a general purpose kind and is not critical, almost any
small PNP type will work.
_ L1 is a bell-transformer which is usually already present in the house, if you wish, you can use a battery instead of the bell transformer, Just hookup a 9-volt battery (or wall adapter) to The +/- .
_ Diode (D1) is required as a rectifier for use with the bell transformer and to protect the circuit from accidental polarity reversal.
_ L2 can be found in an old transistor radio, they look like miniature transformers and are usually colored red or green, you have to try with different transformers as the sound can vary depending on the winding.
_ The speaker is a 8 Ohm type and must be larger than 200milli-Watt. I used a 2Watt type, but anything over 0.2W will do.

This video shows the circuit working, by changing certain values you get mores sounds...



It really sounds like a bird and when you release the doorbell button the sound slowly fades away. I have used this circuit in my house, and even build the circuit for others.




Remember to have fun!!!
Thanks

5 comments:

Anonymous said...

If you set out to make me think today; mission accomplished! I really like your writing style and how you express your ideas. Thank you.best camera doorbell

Anonymous said...

Interesting Post, It increases my knowledge. Undertakings are a piece of any designing educational modules. Final year projects for Electronics Engineering help understudies to execute what they realized in their four years designing examinations. They likewise help the workforce to comprehend their understudies' execution. Engineers Garage is also the website which is only for Electronics and Electrical Engineers. Where students can find various Projects ideas and tutorials on Microcontroller, Electric Circuits and more. Very Helpful website for Final year engineering students which has innovative ideas for projects in electronics and communication.

Unknown said...

I am happy to find this post very useful for me, as it contains lot of information. I always prefer to read the quality content and this thing I found in you post. Thanks for sharing. wohome blog

Liztek said...


The Liztek wireless doorbell features a wide range extending to 1000 feet in an open area and 500 feet in an enclosed area. So, you will never miss any visitors even if you are several rooms away.

Jhon Walker said...

Wow that's great article. I appreciate your post. If you need suggestion than i suggest you smart video doorbell camera to secure your home premises and monitor any visitors 24/7. It has economical price and easy to install.

Post a Comment

hostgator coupon