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Recent content by Chris Hill

  1. Chris Hill

    For Sale: Free to a good home: ETI magazines

    Hello, I'm having a bit of a clear-out and have decided it's time to find a new home for my copies of Electronics Today International (ETI) magazine. I have the following issues: 1979 December 1980 August, September, November 1981 February, March, April, June, August...
  2. Chris Hill

    R/C Relay Driver

    If you have concerns about the op-amp's ability to drive the transistor, why not replace the bipolar transistor with a small MOSFET? A 2N7000 should work, and has the advantage that it doesn't need continuous IB to remain switched on. You would need to take the gate connection direct to pin1 of...
  3. Chris Hill

    Interfering circuits

    I agree with Audioguru and Alec_t. The bipolar version of the 555 (which I think is the one you are using) is notorious for "crowbaring" the power supply when its output changes state. In other words, when the output changes from high to low or vice versa, the device can instantaneously draw a...
  4. Chris Hill

    Link to personal blog in signature?

    Well, since you ask... http://www.learningmicros.blog The blog is mainly about my attempts to learn embedded programming. However in the "Pages" section on the right I am also posting various other bits and pieces which might be useful. I think the Laplace stuff might definitely be of...
  5. Chris Hill

    Newcomer to handling MOSFETS....

    I was a MOSFET Application Engineer for 20 years, and I would largely agree with what *steve* says above. Most general-purpose, non-automotive MOSFETs actually don't have built-in gate protection, but the larger ones tend to be very robust anyway. Susceptibility to static damage tends to be...
  6. Chris Hill

    Default Prism Orpheus Interface with High Pitched noise and hum from SMPS PSU any help?

    It's likely the transformer core is slightly loose or damaged and is vibrating in sympathy with the switching frequency. If that is the case then your only options are a) replace it if you can (could be difficult) or b) live with it. Not sure how capacitors could be causing the problem, unless...
  7. Chris Hill

    Link to personal blog in signature?

    That's fair enough, and I can understand your wish to avoid such behaviour. Not trying to nit-pick here, just getting a clear idea of what is and isn't acceptable.
  8. Chris Hill

    Link to personal blog in signature?

    OK, thanks, that's clear. How about a link to a blog post or page in answer to a specific question?
  9. Chris Hill

    Link to personal blog in signature?

    As the thread title says - is this allowed. I run a personal blog, no commerical advertising, on which I post things which might be of interest or use to others interested in electronics. Is it OK to put a link to this blog in my regular signature?
  10. Chris Hill

    Hello from the English North West!

    Encroyable!
  11. Chris Hill

    Hello from the English North West!

    Thanks, and I hope so - certainly seeing a diverse range of topics already.
  12. Chris Hill

    Hello from the English North West!

    Hello, Interested in all things electronic since an early age, and spent most of my adult life in the electronics industry, one way or another. My professional experience up until now has been mainly analogue (that's how we spell it over here), with particular emphasis on power semiconductors...
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