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Audio and Amplifier Projects

Music Power Level Indicator Circuit using IC LM3915

Last Updated on May 15, 2026 by Swagatam 9 Comments

level2Bmeter2Bcircuit

In this post I have explained a  LED music power level indicator for indicating a subwoofer bass power range, which can be also modified as an effective dancing Electroluminescent Wire light show. The idea was requested by Mr. David. Technical Specifications Here’s an idea or suggestion for your projects or what ever lol My son […]

Filed Under: Audio and Amplifier Projects Tagged With: Indicator, Level, LM3915, Music, Power

Simple Musical Door Bell Circuit

Last Updated on May 15, 2026 by Swagatam 35 Comments

doorbell circuit

A very simple musical door bell circuit can be built and installed in homes, the design features a replaceable music chip option, and an adjustable ringtone duration, as per the user preference, we’ll learn the entire circuit procedure through the following article. Today we can find a huge range of door bells in the market […]

Filed Under: Audio and Amplifier Projects Tagged With: Bell, Door, Musical, Simple

Music Triggered Amplifier Speaker Circuit

Last Updated on May 15, 2026 by Swagatam 8 Comments

buzzercoil

The circuit idea I have explained below enables a power amplifier loudspeakers to switch ON only when there’s an input music available, otherwise it makes sure that the loudspeakers remain shut off. The idea ws requested by Mr. David Alda. Technical Specifications Your site is just awesome. I’m hoping you can post a tweak to […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Music, Speaker, Triggered

Modify Human Speech with this Digital Voice Changer Circuit

Last Updated on May 15, 2026 by Swagatam 24 Comments

voicechangercircuit

In this post I have explained a voice modulator circuit which will change or transform an individuals unique voice into a completely new form. The new voice will be different to the original voice tone and unrecognizable. The Circuit Concept The characteristic tone of  every individuals voice is specifically unique in all circumstances. How often […]

Filed Under: Audio and Amplifier Projects Tagged With: Changer, Digital, Human, Modify, Speech, Voice

Make this Simple Music Box Circuit

Last Updated on May 15, 2026 by Swagatam 12 Comments

musicboxcircuit

This simple circuit can be used to emulate the operation of a music box. The number of notes may be limited to 10 at the most, and therefore is capable of generating a simple melody. By: Akanksha Rathode Circuit Operation The circuit uses two popular integrated circuits: The timer 555 and 4017 decade counter Operation […]

Filed Under: Audio and Amplifier Projects Tagged With: Music, Simple

Extended Telephone Ring Amplifier/Repeater Circuit

Last Updated on May 15, 2026 by Swagatam 2 Comments

telephoneringrepeatercircuit

The discussed phone repeater circuit can extend the range of your land line ring sound from the phone such that one is able to make a call heard in another room or even in another house. By: R.K. Singh Circuit Operation The circuit can be connected with an attached buzzer, the buzzer with a driving […]

Filed Under: Audio and Amplifier Projects Tagged With: Amplifier, Extended, Repeater, Ring, Telephone

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