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Building a DIY Digital Microscope That Transforms My Electronics Workbench

Hi, I'm Bill. I'm a software developer with a passion for making and electronics. I do a lot of things and here is where I ...

Non-invasive quantum spin sensor can detect digital pill signals without skin contact

A research group from the Graduate School of Engineering at Tohoku University has developed a noninvasive means of detecting ...
EDN

A digital frequency detector

I designed the circuit in Figure 1 as a part of a data transmission system that has a carrier frequency of 400 kHz using on-off keying (OOK) modulation. I needed to detect the presence of the carrier ...