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  1. Alec_t

    what's this component??!!

    Welcome to EP! Several components are shown. Which one, and why do you think it is broken?
  2. Alec_t

    Short Circuited Pond Pump Guidance

    Reckon so. It looks well and truly cooked. The electrolytic capacitor top left may have spilled its guts too. Welcome to EP!
  3. Alec_t

    Absorption detector.

    Does the sensor have to be remote from the ice/water, or can the sensor be in contact with it?
  4. Alec_t

    New apartment getting shocked on light switch screws.

    No prob ..... :D:D
  5. Alec_t

    Some Help With Volt Scale Reversal Needed For An Idiot.

    Here's a 3914-based circuit I designed a while back for a guy who was modifying a fuel gauge. Pull-up resistors in conjunction with resistors R11,12 inside the gauge provide a non-linear response to the input signal. Perhaps you could play with their values to get the response you want for your...
  6. Alec_t

    Woo-Woo Small Generator Homemade, Created In Educational Purpose Lighting E 27 230 V Led Bulb

    Why would a lot of people want to invest time and money to do that when one person (you) could provide any details requested and so save a lot of people wasted time and effort?
  7. Alec_t

    Temperature Controller for Oven

    An element like that would be controlled by switching it on and off with a variable duty-cycle. Considering the element's high thermal inertia, the switching could be done either by phase angle control or by whole cycle counting.
  8. Alec_t

    Current Regulator

    The link doesn't work.
  9. Alec_t

    Current Regulator

    What battery chemistry? Lithium batteries are very fussy about their charging regime. A dedicated battery charge control IC might be better/safer than just a constant-current source.
  10. Alec_t

    Current Regulator

    By 'current regulator' do you mean a controllable constant-current source or a current-limiter?
  11. Alec_t

    long distance cell phone detector

    As has been explained on another forum, that circuit won't work.
  12. Alec_t

    Some Help With Volt Scale Reversal Needed For An Idiot.

    Point taken. Thanks.
  13. Alec_t

    Wire up my skirting boards for surround sound

    Are your surround sound speakers passive, or do they require mains power?
  14. Alec_t

    Some Help With Volt Scale Reversal Needed For An Idiot.

    That is the case if the LM3914 is in dot mode, but I don't see how it would work, regardless of the resistor values, because all ten outputs sink the same current. The IC needs to be in bar mode instead, so that an increasing number of current sinks become active as the IC input voltage rises...
  15. Alec_t

    Questions resect plastic of electronics

    UV light will make many plastics brittle in time.
  16. Alec_t

    Repairing An Organ

    Googling "smps schematic" brings up several schematics. Take your pick.
  17. Alec_t

    Reducing 14.8Vdc to 12Vdc

    The simplest way to drop the voltage would be to use 3 silicon diodes in series, dropping ~2.1V to 3V depending on current. Any idea how much current your alarm system draws? A low drop-out regulator would be a better solution.
  18. Alec_t

    Repairing An Organ

    Can't find an exact equivalent, but it's a controller for a switch-mode power supply (SMPS), so perhaps you could just use a ready-built cheap SMPS (plenty advertised) instead?
  19. Alec_t

    Some Help With Volt Scale Reversal Needed For An Idiot.

    Sounds like an opamp could be used to invert and DC offset one of the signals. However, an NTC temp sensor is non-linear, so if the pressure sensor is linear you would have to put up with one or other readout being inaccurate. A micro with an ADC feature might be a better way, with all the...
  20. Alec_t

    Servo control of Outboard Motor Gearshift with 3 Switches

    The Geniuno looks more than capable. Even a smaller micro would do the job, since monitoring three switches and a pot and outputing appropriate signals to two servos in no particular hurry doesn't seem too demanding :) . The software will need to cater for safety features, such as not allowing...
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