One of the two Megawatts I was expecting showed up and sadly it was not "Jim in Denver's". That has to wait until I go north for doctor leechwork and have UPS Store tear their inventory down.
The Whiffie is getting new low ESR Panasonic capacitors and highly reflective shielding between the upright ceramic resistors and the Panasonic caps. The Whiffie's output regulation was getting flaky.
New transistors and Arctic Silver compound. And a new Whole Gale grade 120 mm fan blowing down on the chokes and heat sink. I am triggering the fan for 125F. Either on or off. no soft start. The Whiffle will remain open chassis. It's going to end up doing duty for the Lifeline 31 2-story battery.
I LOST THAT PRICELESS PHOTO AND WRITTEN STORY ABOUT WHICH RESISTOR TO REPLACE WITH A POT. My Wal-Mart El-Cheapo HP blew a fart a week after I downloaded that wonderful piece. My new USB flash drive arrived a week after that. WHOMEVER sends a replacement story, gets a gratis battery circuit de-spiker when I go north in August. It isn't cheap. An MR2535 Motorola avalanche rectifier, a 16-volt TVS device, capacitor and MOV all mounted and sealed on a tiny circuit board. Yes the components are fused with a 2-amp Rice Grain board fuse. This thing laughs at the WORST 12-volt transients like those generated when a chassis AC compressor clutch unloads or when an on-board generator starter is enabled. A transient hits 16.5 volts for a nanosecond and it gets chopped off at the knees. And yes, batteries should be disconnected before they are equalized.
If an online deal "goes through" I should be taking possession of some 5Kw 180 volt bi directional TVS devices that will save a refrigerator board much misery when a 120vac heater element blows open. They are NOS and Norcold or Domestic would have a stroke if they thought they had to include something like this in their board circuitry.
I spent last night analyzing a Dodge and a Ford ECU control assembly. They both had a surprising (to me) number of transient voltage suppression devices laid out in their circuitry. What is missing is the suppressors are far more effective the closer they get to the offensive emitter. Chassis AC clutches and engine and generator starter motors are the worse offenders. OEM uses 200 watt rated devices. I choose 1,500 watt or higher, and 16.5 or 17 volt devices not 25 volt.
Idle Hands Are The Devil's Workshop
