A little something different for today’s article, and maybe something to play around with if you have some time this weekend. I’ve found you all some circuits and construction information for Video Transmitters, a 5V power supply, and a GPS tracker. (more…)

The Everyday Practical Electronics (EPE) Magazine is the number one hobby electronics and computer projects magazine in the UK. Their focus is on practical circuits and projects, and the magazine features a number of smaller useful circuits in addition to those featured on the front cover. (more…)

GSM Trackers are great low-cost tracking devices, but they will only give you the location of the tracker within a 100 metre radius. So if you’re tracking something in an urban area, a 100 metre radius is a very large area indeed. A great way to solve this is to use a localised transmitter to track down the device within this radius. Think of a GSM tracker as being a coarse tracking device, and a localised transmitter as a fine tuning tracking device. (more…)

You know the films in which there is some devious labyrinth of laser beams which some hero has to get through in order to steal something of great value or to save the day (such as Mission Impossible or Entrapment), well how about making your own laser tripwire system? (more…)

While looking around on MAKE Magazine, I found a useful little circuit for a telephone bug. I know how much you guys love circuit diagrams! (more…)

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In a recent article, I discussed the difference between parallel and series telephone taps. In this article, I present a very simple and reliable parallel phone tap circuit useful for recording telephone conversations onto a tape recorder. (more…)

In a flash of inspiration, I thought visitors to SpyReview might appreciate circuit diagrams for various surveillance circuits. Therefore I have started a new category of posts on the site called “Circuits” (duh!). (more…)