A linear variable power supply with current limiting for the workbench. Features microprocessor voltage and current monitoring and RS232 interface.

I was recently given this old bench multimeter after it sat in a box unused for some twenty or more years. With some modification to the power supply it is now back in service as as worthwhile addition to my workbench.

A variable gain hybrid-cascode amplifier stage followed by separate feedback amplifier stage, as used for amplifying the output from AD9850 DDS module as the basis for an HF signal generator.

A DIY build of VK2BTL's sensitive field strength meter circuit design, using parts from an old CB SWR meter. Ideal for testing antenna, radio control and handheld transmitters.