EEVblog

Fundamentals Friday. A tutorial on Zener Diodes. Avalanche breakdown, zener breakdown, zener effect, knee voltage, power dissipation, differences from regular diodes, calculating dropper resistor value, voltage regulation, clipping, clamping, transient surge overvoltage protection, characteristic curve, forward and reverse characteristics. Forum HERE Podcast: Download

Rocking straight out of 1989, what makes the Sony GV-9E Video Walkman a marvel of engineering, yet ultimately a flop? Manual HERE What’s on the tape VIDEO Glass delay lines VIDEO Forum HERE Podcast: Download

More Mailbag Forum HERE SPOILERS: Amateur HAM Radio Study Guides from Dan Romanchik PCBite professional PCB holder Accurate panel meter Valve Bonanza Turns your PSU into a USB charger OP.A FM Synthesiser Arduino Shield Flip Dot Displays Lumintop TD16 1000 lumens Tactical Flashlight Torch: Worm AAA Keyring Torch Worm Brass …

Dave screwed up and now he has to fix it. What went wrong with the vintage Hewlett Packard HP85 personal computer? Forum HERE Podcast: Download

1979, a screaming 613KHz clock, killer graphics, and it’s a Hewlett Packard, it doesn’t get much better than this! Dave powers up the the classic HP85 Scientific / Engineering Professional Personal Computer and has a play around. Forum HERE Teardown VIDEO Repair VIDEO User Manual Pocket Guide Documents: Collection Manuals …