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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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One for the electronics types.
Been fixing the Lucas ECU on an old Jaguar. Similar to the type used on my
Rover. The fault was on the 5v regulated supply. Being a 50 year old design, all done with discrete components. Now fixed. But looking at the design, one thing I'd like explained. The 5 volt rail, as well as powering internal things, is exported to 'power' the throttle position sensor, coolant temperature sensor and air flow meter. After the regulator, and just to this external 5v feed, there is additional smoothing etc. And between two of the smoothing caps, a diode. Which reduces the 5v to the nominal 4.3 +/-0.2v of the external rail. Any guesses as to the purpose of this diode? -- *Why is it called tourist season if we can't shoot at them? Dave Plowman London SW To e-mail, change noise into sound. |
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