Electronic projects

High-quality modular design. 9V Battery powered - Very low current drawing. Preamp, tone control, mixer - all in one

author: RED Free Circuit Designs
visits: 433

This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components.

author:
visits: 401

Simple add-on module. Switchable "Control-flat" option.

author: RED Free Circuit Designs
visits: 397

author: Andy Collinson
visits: 393

Useful to listen in faint sounds. 1.5V Battery operation. Amplifies only faint and weak sounds!

author: RED Free Circuit Designs
visits: 388

22w audio amplifier built of TDA1554 and some passive components. Can be used in car audio systems.

author:
visits: 364

This 3 channel 15 LED spectrum analyzer is the perfect addition to any audio amp project. It produces fantastic displays on three LED bars that can be individually adjusted for any particular frequency range.

author:
visits: 348

Timer circuit that turns-off your amplifier when idle for 15 minutes. Fed by amplifier tape-output.

author: RED Free Circuit Designs
visits: 345

Simple circuitry suitable for moving-magnet cartridges. Passive high-frequency equalization

author: RED Free Circuit Designs
visits: 344

This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like it’s shown in the table (from 20 W to 80 W RMS).

author: Jacint Chapo
visits: 340