This simple 4093-based audio peak detector from December 2004 monitors music and turns on a small light when the sound gets ...

One of the problems encountered thus far with 3D-printing circuits with conductive filament is that it doesn’t really bond to anything, let alone solder, so how does one use it? [mikey77] wrote an ...

This is a diy simple stun gun circuit showned only for learning! In No Way Do I Recommend Building these Stun-Guns or the actual use of them for any purpose what so-ever. We will present more stun gun ...

A very simple DIY crystal oscillator circuit which use a quartz for frequency stability and a good rf transistor. Use a 2-nd or 3-rd harmonic crystal, for example if you want 100MHz use a 50MHz or ...

As STEM learning becomes more mainstream from elementary to high school, more products that are STEM-specific are hitting the market. One such product started off on Kickstarter, and after being ...