This is a basic radio circuit that works like a crystal radio but with a booster. It can pick up many strong radio stations nearby with a 10 foot antenna. A longer antenna can help catch more stations, but it might also pick up unwanted ones. These unwanted stations can sound faint in the background […]
Audio Circuits
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Simple Passive Crossover Network Circuit for Loudspeakers
Imagine a conductor sorting instruments in an orchestra. A passive crossover network in a speaker system acts like that conductor, but for sound. Regular speakers have multiple parts kind of like mini speakers, each built to handle different sound tones. Tweeters handle high squeaky sounds, woofers handle deep booming sounds and sometimes there are midrange […]
Simple Surround Sound Speaker Circuit
This circuit shows you how to improve your surround sound system without needing fancy new speakers. It uses a technique called the Hafler circuit invented by David Hafler that simply uses a knob and speaker placement to make the sound coming from the front and back speakers sound more balanced. What is a Surround Sound […]
Simple Musical Doorbell Circuit using IC UM66
Want a doorbell with a twist? This post shows you how to build a musical doorbell that plays a little tune instead of just a buzz! It uses a special chip called a UM66T melody generator IC and only a few other parts. This project is great for beginners because it is easy to build […]
Simple Audio Mixer Circuit using a Single Transistor
This post shows you how to build a simple circuit that mixes two sounds together. This is like a mini DJ mixer, but it only uses one transistor a tiny switch to combine two different sounds into one. This is a great project to learn about how electronics can mix sounds together. Circuit Working: Parts […]
Simple Echo Effect Generator Circuit
This post shows you how to build a circuit that adds an echo effect to your music! It uses a common part called a transistor BC547 to make your music sound like it is echoing in a big space. What is an Echo Effect Generator Circuit: An electrical circuit called an echo effect generator circuit […]