Design idea that appeared on "Circuit Ideas" of Electronics World Magazine in November 2000 and won £50. The idea is to provide crowbar protection on a power supply with adjustable output voltage. The crowbar circuit is temporary disabled when user trying to adjust the output voltage and re-establish with the correct tripping level once the user had finish adjusting the output. The idea was later voted best in the second round of contest and won me a 4-1/2 digit digital multimeter worth £500.
Schematic and circuit description of a switching supply (old new stock) bought from GreenWeld U.K.
Schematic of a in-car switching supply for mobile phone use/battery charger
Schematic of a sealed switching supply for CD player or digital camera
Schematic of an isolated voltage input for computer
