Modernizing a laptop bench power supply @ZakKemble

Zak Kemble posts on Zak’s Electronics Blog:

Many years ago (September 2009) I made a simple bench power supply using an LT1083 7.5A linear regulator with adjustable output voltage designed to be used with a 19.5V 3.42A laptop power supply. It still works fine after years of abuse, but my choice of output power connectors was poor (3 pin headers, the sort used for PC fans), it’s made on strip board and cooling was sometimes a problem, so time for an upgrade!

The old power supply also had a selector jumper for 6 voltage ranges; 3V, 5V, 7V, 9V, 12V and 19V. I think I’ve only ever used the 5V, 12V and 19V ranges, so that’s all the new power supply now has.

The new supply uses modern components while still keeping true to the simplicity of the original supply.

See the post for all the details.


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