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Posts posted by ante

  1. Hi Guys,

    Today SMPSU’s are found frequently in home electronics equipment. Almost every VCR, DVD players, tuners, TV-sets and similar has got them and so do every computer laptop or other computer. The smaller and lighter SMPSU’s are cheap to make and they save weight and space in the containers shipped form Asia to US and Europe. The cabinets can be made smaller since the temperature rise and the need for cooling is less, and no bulky transformer. However I haven’t seen any in audio power amplifiers for home use yet. Audio power amplifiers for vehicles always got switchers for the step-up voltage converter. Most SMPSU’s run in the 30 – 200 kHz range and should not cause any hum in audio equipment, perhaps the high current demand in a power amp is the reason? But then again today’s computers carry PSU’s up to 700W and more at very high current levels so I’m not sure about that.
    BTW, my lab-PSU (0-40V 0-5A) is a switcher too! ;D

  2. I don’t know anything about the content of the Heath books you’ve got. However the few Heath-kits I have built myself many years ago had some very pedagogical documentation.

    If you are going for test equipment projects I can recommend this one: http://www.uoguelph.ca/~antoon/circ/latching.html
    Very useful in many cases yet simple to assemble!

  3. Hi helluvawreck! (No offence) ;D

    Welcome to our forum!

    You seem to have your hands in almost everything and even wants some more! I know the feeling; it’s nice to be in control of everything if possible or at least try to find out how everything works and interconnects.

    I would buy used test equipment to keep the prize at a reasonable level and maybe get a few extra accessories in the deal too.

    Do you have any special requests for projects or just anything to start with? Have you checked out our projects here on E-Lab? ;)

  4. Hi Herman,

    I do not have Eagle installed in my computer; you can (while Eagle displays the circuit) make a screen dump (Prnt Scrn key) and post it here.  8)
    For the future (wouldn’t have helped in this case but); if you have a file with a suffix not allowed (like .sch) just ZIP or RAR it and it’s possible to post it.  ;)

  5. To power the timer a small PP-3 and a low drop regulator like L4940 or similar would be fine, this will keep the timer run exactly right each time.
    Here are a few examples on CD4060 circuits, of which some are very well explained:

  6. The project's output can be changed a little to drive a transistor that can turn on an alarm when there is an earthquake nearby, if you don't feel the vibrations yourself. It will probably also detect lightning's thunder pretty well. Maybe also kangaroos jumping along? Elephants? ;D

    So we are talking a 7.0 or higher on the Richter scale here?  ;)
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