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  1. B

    Circuit failure indicator

    neon will glow whenever coil is energised.
  2. B

    Peltier cooler

    Many sources of energy loss.
  3. B

    LM317 2N3055 Variable Circuit Problems

    Most leds need at least 1.7v to turn on.
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    I found a cheap and great way to get rid of Rosin off of a PCB.

    Guess you missed the point... o_O
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    testing electrical equipment

    Can you point towards the type of test equipment used. I'm guessing it was an "appliance tester" of which there are many type available these days. Operation of these devices do not inject 2 to 3 kv that I am aware of, more like 500v which is the standard insulation test voltage for 240v...
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    16 Volt DC conversion to 12 Volt AC

    Perhaps mod one of these.... good starting point. http://www.ebay.com.au/itm/DC-AC-Inverter-12V-to-220V-110V-150W-Boost-Step-UP-Power-Module-Transformer-R2A7-/142091193324?hash=item21154b8bec:g:5E0AAOSw0UdXtvZJ
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    Faulty power supply

    I'd start by testing the output of the transformer.
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    I found a cheap and great way to get rid of Rosin off of a PCB.

    Compared to the amount one uses, you've probably contaminated the Earth 10 fold posting your comment.:confused:
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    Generating a DC supply from the attached circuit

    One could get hung by the authorities if this "generated" low voltage was brought out into the real world without approved isolation.
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    Faulty power supply

    A 240V input power supply with adjustable output in 1 volt increments Output voltage variable by rotary control knob up to 13V Continuously rated output of 8.5A, AC or DC Note on the bottom of the unit ....... The internal transformer is protected by a thermal trip. This will not operate in...
  11. B

    HELP: project not working

    10K seems high for the bc108 base and the LED resistor.
  12. B

    I found a cheap and great way to get rid of Rosin off of a PCB.

    I.ve always used a bit of mineral turpentine.
  13. B

    fluorescent ballast replace question

    Balasts do fail and will either go open circuit or short out, the latter causing tube elements to blow clean out. Depending on tube size, balast resistance should be somewhere around 40R.
  14. B

    How do I adjust the Voltage for an immersion heater?

    Or a rather large diode(20A) for approx. 1/2 power Have you thought about a simmerstat also? Used on cooker elements.....supply full grunt for small amounts of time. Time on depending how far you turn the dial. Regulation (switching action) is supplied from an internal set bimetal contacts.
  15. B

    fluorescent ballast replace question

    Economically, it's better to get the whole fitting replaced. 20years is a pretty good run.
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    LM317 2N3055 Variable Circuit Problems

    Maybe you should take up knitting instead. :)
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    Water level sensor

    Are you looking for water level (as in heading) or conductivity (as in description)...?
  18. B

    Burned a solenoid with a relay timer, and I don't know why

    AC and DC coil solenoids are different in the core of the solenoid and the armature. One is not interchangable with the other. Get it a-about and it will cook. When you said you had the coil opening /closing for 2 minutes, I took it (in English) to mean you were cycling over a short period on...
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    Burned a solenoid with a relay timer, and I don't know why

    Ed, Your diagram shows AC on the timer coil but it could be also a DC unit. I don't believe the Op really said which.
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    Burned a solenoid with a relay timer, and I don't know why

    Doesn't work like that. Coil will draw only what it requires. What may be of concern is the spec says it requires voltage within 10% of rating ( this case 12V ) so if the voltage is dropping due to small cabling, long cable run etc. this will stop the solenoid engaging properly and draw larger...
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