Named after its creator, the theremin originated in the Soviet Union in the beginning of 1920's. This comprised of a container installed with a couple of antennas. It did not have any keyboard to … [Read more...] about Digital Theremin Circuit – Make Music with your Hands
Cup Full Indicator Circuit for the Visually Challenged
This circuit basically is a fluid level alarm indicator intended for alerting visually impaired individuals regarding the liquid level in a container such as cup, glass or bowl. The unit can be … [Read more...] about Cup Full Indicator Circuit for the Visually Challenged
LM4862 Amplifier Circuit – A Better LM386 Alternative
The LM386 based amplifier is still very popular as one of the smallest sized amplifier chips. However, the LM386 is not perfect and has a few drawbacks and limitations. As shown below, the LM386 … [Read more...] about LM4862 Amplifier Circuit – A Better LM386 Alternative
IC 555 Oscillator, Alarm and Siren Circuits
In this post we will learn how to build and optimize basic IC 555 oscillator circuits, whose waveforms can be further enhanced for generating complex sound effects such as warble alarm, police siren, … [Read more...] about IC 555 Oscillator, Alarm and Siren Circuits
Laughter Sound Simulator Circuit
As the name suggests, this device generates electronic sound, resembling human laughter. BASIC DESIGN To enable the circuit start the proposed operations, it must have a fundamental sound … [Read more...] about Laughter Sound Simulator Circuit
Electronic Touch Organ Circuit
An electronic touch organ is an intriguing musical device which produces very pleasant musical notes in response to finger touches on special touch sensitive electronic pads or buttons. Modern … [Read more...] about Electronic Touch Organ Circuit