This is the circuit diagram of electronic hearing aid featured with sensitive sound detection and energy saving, so this hearing aid will work in the […]


This is the simple spring reverb guitar effect circuit that can be built low cost and just requires a minimal amount of electronic parts and […]

This is the schematic diagram of Infrared (IR) cordless headphone. Maybe it also can be called “wireless headphone”, but it use infrared as sound signal […]

Here is the circuit diagram of stereo digital volume control. This circuit could possibly be applied for upgrading your manual volume management within a stereo […]

This is the circuit diagram of USB powered stereo computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, […]

This is an easy, low cost and easy built circuit of an electronic horn which is designed close to quadruple op-amp IC LM3900 (IC1). IC […]

Here the low cost and easy build circuit of ticking bomb sound generator. This circuit generates a sound matching to a loud clicking clock. The […]

Here the cheap hearing aid to help people who have hearing loss. Commercially available assistive hearing devices are quite expensive. This is a cheap hearing […]

This is the circuit diagram of mic condenser amplifier. The low-cost and compact mic condenser audio amplifier described right here is deliver good-quality audio of […]