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Scott Dorsey wrote:
Imagine if you will a group of design engineers sitting around trying to figure out how to make equipment more annoying for broadcast folks. "I know, we can put the power supply all at the bottom so you have to pull all the channel strips out to get to it, making it impossible to test under load." "Great, and then we can use output capacitors that fail into intermittent shorts so that the supply has to be loaded to find them!" I didn't know you'd ever worked at KCSC-FM. Regulators with failure modes that involve smoking the full-wave bridge. Capacitors that explode. Leaking tantalum capacitors that eat the traces off the boards. Leaking batteries ditto. UPS battery chargers adjusted so that the "float" voltage is about 10% too high, so that the batteries outgas, leak, and die. Ground-loop city. A plate capacitor on the ttransmitter's final that turns out to be a strip of PTFE wrapped around the final tube, above the HV lead, and which gets punched through about once a month. A grounding hook with a broken resistor in it. The idea is to discharge the HV PS capacitors "gently". That's fine, as long as the resistor maintains continuity and discharge to "safe" levels (0 VDC for me, TYVM) doesn't take a week. -- The official state religion of France is Bureaucracy. They've replaced the Trinity with the Triplicate. (David Richerby) |