Electromagnetic Telephone Ringer Circuit helps us know when call comes an when there is no need connect to phone line. This circuit is useful when there is no access or do not want to touch phone line. It works by sensing electromagnetic field from ringing signal and then buzzer turns ON. The circuit can run […]
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Tone Generator Doorbell Circuit using Dual IC 555 Timers
This tutorial is about Tone Generator Doorbell Circuit using Dual IC 555 timers. This circuit is simple and works well when button is pressed. One IC works in astable mode and other in monostable mode. It is very important for making sound to run a 8Ω speaker. The circuit needs 9V DC power and makes […]
9V Battery Powered Transistor Intercom Circuit
Intercom system is device for talking at short distance. 9V Battery Powered Transistor Intercom Circuit uses 9V battery which is good for home or office talk. It uses only transistors which is easy to understand and works well. The circuit has mic and small speaker as sound. BC547 transistors make sound loud and 2N2222 transistor […]
Designing a UJT-Based Audio Tone Generator Circuit
Designing a UJT-Based Audio Tone Generator Circuit is easy and fun. It makes music sound like small instrument. It use UJT as relaxation oscillator. Push buttons change frequency with different notes. Sound goes to speaker after amplifier. Press button, tone change and w UJT 2N2646 will make right frequency. Transistor boost the sound from speaker. […]
Canary Bird Chirp Generator Circuit
Canary Bird Chirp Generator Circuit is fun and easy circuit. It make sound like real canary bird chirping. Works like audio oscillator to copy bird sound. Circuit is used in toys, sound gadgets or DIY projects. It runs on 9V battery so anyone can use it easily. Circuit Working: Parts List: Component Specification Quantity Resistors […]
Jet Engine Sound Generator Circuit using IC HT2844P
Jet Engine Sound Generator Circuit using IC HT2844P is fun and learning project. It makes jet engine sound using simple parts. It uses IC HT2844P sound chip to make real jet noise which is good for model fans, school work or DIY fun. Circuit needs 3V power and keeps under 3.3V or else circuit may break. […]