start up aid for pcs


Posted on Feb 6, 2014

The older PC that concerned did have a standby state, but no matching BIOS set-ting that allows it to start up unattended. Although a +5 V standby supply voltage is available, you always have to push a but-ton for a short time to start the computer up again. Modern PCs often do have the option in the BIOS which makes an automatic start after a pow


start up aid for pcs
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er outage possible. After building in the accompanying circuit, the PC starts after about a second. Incidentally, the push-button still functions as before. The circuit is built around two golden oldies: a NE555 as single-shot pulse generator and a TL7705 reset generator. The reset generator will generate a pulse of about 1 second after the supply voltage appears. The RC circuit between the TL7705 and the NE555 provides a small trigger pulse during the falling edge of the 1 second pulse. The NE555 reacts to this by generating a nice pulse of 1. 1RC. During that time the output transistor bridges the above mentioned push button switch of the PC, so it will start obediently.




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