Sound: Activated Switches

Adjust the sensitivity of this circuit to control a Relay that can turn on whatever is connected to the contacts of the relay. Very practical circuit for a variety of projects. Turn on a light when your dog barks, or set of a siren when an intruder makes

This mini-VOX - voice operated relay - is based on a circuit published in Silicon Chip, 9/1994, p31.

Easy to build Gun Sound Effects generator kits, also inludes several different sounds and tunes.

Sound turns on the transmitter, which operates in the FM radio band. A neat way to catch a thief in another room or garage. The volume of sound needed to trigger the circuit is adjustable. The two stage transmitter has good range and the circuit powers do

Easy to build sound effect generator kits, inludes several different sounds and tunes.

Three relay-based electronic switching circuits that switch according to light levels.

Easy to build sound effect generator kits, inludes several different sounds and tunes.

Extremely useful electronic circuit capable of producing a variety of cool sound effects.

Easy to build sound effect generator kits, inludes several different sounds and tunes.

An electronic circuit that uses a 556 (Dual timer) IC to produce a two-tone train horn sound effect. Equivalent circuit using two 555 timers (single timers) is given.

This page links to two electronic circuits. Once circuit produces emergency siren noises (police, fire, ambulance), and the other is a chime type sound effect.

This is the Brodcast Warehouse All-in-One PCB 1 Watt FM Transmitter. This item has a built in limiter / compressor & stereo encoder!

A stronger, Mecha-Medusa is a walking robot that operates with the aid of a sound sensor. Clap hands or snap fingers to command this robot to start walking on four legs. Stops automatically after a preset time. Ideal for the hobbyist or budding scientist.

Simple schematic for a doorbell electronic circuit that produces a ding-dong sound when your visitors presses the door-bell button. Based on IC 8021-2.

This circuit will play a tune when light strikes a light dependent resistor, such as when a music box lid is opened.

Dick Cappel's page illustrates an extremely basic small FM transmitter that rebroadcasts sounds using a 1.5 Volt battery. very simple circuit.

Easy to build sound effect generator kits, inludes several different sounds and tunes.

Our Morse Moris code guide shows the Morse code beeps and sounds for the alphabet, which will help you read Morse Code moris code. Also features Alphabetic sounds for Moris Code.

Electronic circuit that connects to phone line and produces and flashing LED and audible sound when there is an incoming call.

Our low cost stereo encoder is the perfect way to transform your radio statio into stereo sound with a low budget.

Our low cost stereo encoder is the perfect way to transform your radio statio into stereo sound with a low budget.