I realize this was vanagon related when it began, and I rarely make this observation, but this is the third or fourth time in recent memory that we've had to endure this kind of obscure egg-headery, particularly regarding electronics. If y'all actually solve some need as a result of these discussions, then that's all good, but could you guys please take the discussion itself off-list? It gets pretty dense and wearying after a while. Cya, Robert -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Rocket J Squirrel Sent: Tuesday, September 29, 2009 9:23 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: ARRRGGGHHH Re: Tantalum capacitors to stop blinking temp LED Ah well then -- never mind. -- Mike "Rocket J Squirrel" Elliott 84 Westfalia: Mellow Yellow ("The Electrical Banana") 74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.) Bend, OR KG6RCR
On 9/29/2009 9:03 AM David Beierl wrote: > At 10:48 AM 9/29/2009, Rocket J Squirrel wrote: >> That's not the same as a 0pf capacitor. It's the same as a resistor, and >> if the capacitor is being charged through another resistor until it >> reaches the shutoff trigger voltage, and that capacitor is paralleled >> with >> a resistor to model the internal leakage (or schmutz on the board, the >> proposed "external" portion of the leakage) then you got a voltage >> divider >> which will prevent the voltage at the top of the cap from ever reaching >> blink-o-matic shutoff voltage. > > Mike's talking about removing the cap entirely, so aside from the fact > that the newer level controllers *need* that timed blink, the only issue > would be leakage across the board, which isn't enough to matter by > itself. The current source for the cap would drive the chip high > directly. Of course that might inhibit the blink completely, probably > would I think -- can't remember the circuit well enough. But it's moot > because of the controllers. > > :-) > d > > |
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