@cnwdon posted:Thank you. The location principle is now understood. Sorry, but my brain is in “concrete” rather than abstract mode with the above questions, so I’m still unsure about the practical application and packaging-in-the-TIU nuts and bolts.
1. Follow the leads from the track outputs internally within the TIU to their outputs from the board, and install both of these "devices" across the hot and neutral outputs at that location or as close (well under 1 inch) as we can get it packaged in there. One could create a package of the primary TVS and the beefy clamp, with a shared terminal point at each end, so as to have just one soldered connection to the board outputs? Use of a low wattage soldering pen, low melting point solder, safest least corrosive flux, heat sinks, etc are familiar skills.
2. Are you saying the "beefy clamp" is two pairs of 1n4148 diodes, each pair "nose to nose" with say positive sides facing each other and negatives at each end, these two pairs installed in parallel beside each other? I’m trying to translate your description of this in the post above.
Again, thanks
1. There's a doodle in the original thread about where to solder the TVSs too that provide good protection nice and close to the drivers. The beefy clamp rectifiers can be further away since they only kick in for sustained events, and don't need to respond quickly (by scaling 10ns is 10")...
2. So the TVS voltage we used is 9.2V. Then the Beefy clamp is two parallel branches of 13 series 1n4148s so you get an effective forward drop of 0.7V X 13 = 9.1V. This is what you want, the beefy clamp to have a slightly lower turn on voltage, so that in longer pulses, the sustained current is handed over from the TVS to the rectifiers.
