Logic PSU with Overvoltage Protection


Posted on Jun 27, 2012

The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC`s are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but requires several hundred milliseconds to respond. This circuit will react in a few microseconds, triggered when the output voltage exceeds the limit of the zener diode.


Logic PSU with Overvoltage Protection
Click here to download the full size of the above Circuit.




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