Month: July 2006

DIY Sound level indicator

DIY Sound level indicator

Audioguru writes – “This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB […]

The Trackball telescope

The Trackball telescope

A ton of Makers sent this telescope in, it’s called the trackball telescope and it’s public domain, Jerry writes – “…I searched the U.S. Patent and Trademark Office database, and came up blank there, too. As near as I can tell, I have come up with a new design for a mount that not only […]