DIY cable tester

In this blog I will show you two ways to make a cable tester. The 1st way uses a arduino (software controlled). The 2nd way uses a decade counter chip(CD4017) and a flashing LED. I am going to order the Dual RJ45 jack to screw terminals from eBay. The other connectors are from parts-express. I …

De Sauty’s Bridge

This bridge is good for measuring Capacitors. What you do is hookup high impedance headphones to the output(V2 in the NL5 Circuit). Then adjust the resistor(s) , you can use the calculator below to find a suitable resistance for the resistors. This works like a Wheatstone bridge except one side has capacitors. The calculator calculates …

$32 dollar isolation transformer

Here’s a simple easy to build Isolation Transformer that you can buy from All Electronics. Here’s what you need: 1x 120VAC Output transformer 1x outlet connector 1x power cord You can add a 1/2A fuse that goes on the output of the transformer


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