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(mis) Adventures in Hi-Fi

Tag: power

Amplifier soft-start and low voltage illuminated on/off switch – H9KPXG

Posted on 24 September 202026 September 2020

Regular DIYAudio contributor Mark Johnson has kindly released this project into the public domain. The impetus behind the project was the desire for the designer to safely use a low current, front panel switch of the anti-vandal type in power amplifiers. The board incorporates inrush current limiting, wiring for the on/of switch and an auxiliary…

DC Splitter for Bench PSU

Posted on 7 July 202026 September 2020

There is often a need for a dual voltage supply when dealing with audio (op amps often require dual supplies for example) but there may not be a suitable one at hand. There is, however, usually a single supply, a wall adaptor, bench supply etc. and, at its most basic, all that is required to…

Headphones Dummy Load

Posted on 17 May 202017 May 2020

A dummy load simulates your headphones by presenting the amplifier with an impedance as close to that of your headphones as possible, using high wattage resistors. There are a number of reasons you may wish to use this – but primarily you are able to protect your headphones and your hearing. You can use higher…

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