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| Re: Those pesky 74LS00 and 74LS01 chips! / Re: Track Detectors (872450) | |||
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Re: Those pesky 74LS00 and 74LS01 chips! / Re: Track Detectors |
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Posted by SelkirkTMO on Mon Dec 14 17:05:00 2009, in response to Re: Those pesky 74LS00 and 74LS01 chips! / Re: Track Detectors, posted by Robert King on Mon Dec 14 16:20:02 2009. Never went with the 75 series, was too comfortable with 74 ... built lots of routing switchers with those bad boys, and CMOS switches for the matrices. Sadly though, like Grass Valley of yore, I prefered 2N4124's and 2N4126's galore so I could do +/- amplifier circuits to make video clamping happy. I had this obsession with no overshoots or spikes on sync clamps and flat out to 50 MHz in the amplifiers.In some ways though, I'd agree with the foamers and railway engineers. Stuff that shorts out when they see 10 volts on an input aren't such a great idea if there's the remote possibility that 600 volts might appear some day. Though if I could assure myself that I would never be riding on top of electric traction when that occurred, I might consider designing it. :) |
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