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    Variable Voltage Lab Power Supply Using PSU

    To be honest I can't see how you intend using your DIY device. This does not help anyone wishing to suggest improvements. One thing I'd suggest is you allow for case ventilation if you intend operation for more than 10 mins or so at a time.
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    Long duration timers - Notes for beginners

    "Notes for beginners" Not so sure this is an adequate set for the beginner. I had to read all the comments, which I found rather more helpful, particularly the general view that a micro controller provides a low cost & optimal solution. I would still like to know which mc meets those requirements.
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    HP8165A Cooling Fan Direction?

    Mostly the posted advice is sound. My earlier contribution was not as carefully worded as it should have been. I meant to say that "air leaks" which result in reduction of the air flow are to be avoided. It should be clearly understood that the flow rate of air in & out must be very nearly...
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    HP8165A Cooling Fan Direction?

    Generally it just does not matter. It may be obvious when you have the replacement fan, screw hole placement can be a guide for example. What matters is that you don't "leak air". In other words be sure 90% at least of the cooling air is actually flowing into or out of the compartment to be...
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    What kind of Diode is this?

    I recognise the type. A typical spec for a diode of similar appearance can be found: Vishay BYV26A - "Ultra fast avalanche sintered glass diode" (Case SOD-57). Average forward current 1 amp, reverse voltage max 600V. In this case the diode was installed within a washing machine motor controller...
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    Hello, Welcome! (Introduce yourself)

    Hello everyone, I've visited many times & learnt a lot but until now I have not posted. I gather here is the place for new posts for those in my position. So recently our Fisher & Paykel domestic washing machine stopped working with a bang & blew the house RCD breaker. I investigated &...
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    Hand solder of small SMT components

    I have just read a thread here on this very subject but then lost it. Anyway I wanted to ask more questions, The component I wish to solder to a prototype board is a 36 contact IC 5mm x 5mm. Linear LT3651 IUHE-4.2#PBF. The contacts are not visible from the top which surely presents a special...
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