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    controlling 220v

    Well, I certainly agree with the undesirability of burying a relay in the garden, but why would you have to do that?  Wouldn't the relay be located at the controller in your house, rather than in the garden?  Would you care to explain more about the details your application? awright
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    controlling 220v

    Why don't you want to use a bistable relay?  Seems like a natural for your application. If you had the skill to design a 24 volt control system, why can't you do the same for a lighting system?  Both require steady on controller power.  Can't you use the same sensing of the 6V controller...
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    Power freq 50hz or 60hz issue

    The answer used to be a simple yes, but no longer.  High efficiency clothes washers like the new front-loaders often use switched reluctance motors instead of induction motors because switched reluctance motors driven by sophisticated electronics can provide easy reversability and a wide range...
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    Transformer question

    I haven't gone back over the entire thread to remind myself of how we got to this point, but I think that Gazza"s analysis is a little simplistic.  I also do not claim to be a transformer engineer. Pin = Pout ignores the losses in the transformer which can become significant for a small...
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    Power freq 50hz or 60hz issue

    The answer is complex and requires some knowlege of the nature of the specific equipment you want to change power frequency on. In general, induction motor driven equipment will be OK with higher than design frequency power, but not lower, but you have to check what the increased speed of a 50...
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    Transformer question

    I have to disagree with Gazza.  Since the voltage ratio rockazella inquired about is the same for both input voltages and both are below the voltage rating for the transformer, it will be fine for stepping 120 volts down to 60 volts, as Ldanielrosa said.  You don't need and couldn't use a tap to...
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    flickering sound activated light

    You are describing a LIGHT ORGAN.  This is a device that modulates the power to one or more lights in response to audio input to the device.  While the basic components of such a device are relatively simple and straightforward, I believe that your best bet for getting one up and running by...
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    Stupid observation

    Well, Kevin, since millions of people use wrist straps with series resistors in the belief that the resistor will protect them from injury resulting from accidental contact with line voltage while wearing the strap, can you provide a little more fact-based analysis of why the protection is not...
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    Transformers

    The second transformer will either saturate immediately or will not saturate.  It is a magnetic, not a thermal phenomenon.  It may overheat, also, depending upon loading and possible saturation. Well designed transformers applied within their ratings are among the most efficient items of...
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    Veronica PLL

    Oh.  Thanks for the info. awright
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    Veronica PLL

    But, Audioguru, isn't the pre-emphasis just a simple RC network that could easily be added to the Veronica? awright
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    Veronica PLL

    Well, the link opened for me, but the schematic there is impossible to read unexpanded and if you expand it you can only see a small portion of the schematic, making it difficult to read
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    Help!!!

    microzone, an opto-interrupter is simply a matched pair of light emitter and detector facing each other in a plastic molding that provides a slot through which an opaque object can pass to block or "interrupt" the light path from emitter to detector.  Just think of it as a matched pair emitter...
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    how to build my own buzzer? (or other noise maker)

    Glad to see young people developing an interest in electronics, Sarah.  Hope it's not too late for a few suggestions. You have probably seen the novelty caps with a small solar cell powering a fan blowing air into the cap.  Consider using a small, low power motors like that with beaters or...
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    Stupid observation

    Why do you say the resistor in the wrist strap will not protect you "one iota" around "high voltage"?  How high is the voltage you are working around?  Assuming the strap has a typical resistor of at least, say, one megohm, current would be limited to a couple of hundred microamps if you...
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    Microwave transformer

    77710, the voltage doubler is built into the oven circuit, as shown in the schematic you posted along with the picture of the transformer.
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    Help!!!

    As Tedyp said, you don't have to limit yourself to IR if the interior of the coin drop area is adequately shielded from exterior light, although IR would work fine. Do you have to detect coins of many sizes, or just one size?  If one size, then a simple opto-interrupter module should work...
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    Hey all. New member ere. A little help please??

    Why would you want to reduce the temperature of the coil?  Isn't it there with the intention that it get hot to aid in ingition of the charge in the engine?  Are you getting preignition or some other malfunction related to the temperature of the coil? And no, there is no electrical heat sucker...
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    Battery Voltage distribution Help Required--!!!

    shaiqbashir, 5AH means 5 Amp-Hours, and is an indicator of the total energy capacity (NOT capacitance) of the battery, that is, the total energy that the battery can supply under specific, ideal, conditions.  (Well, it's not really an ENERGY rating because the Amp-Hour rating does not take...
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    what is capacitor function

    Well, the schematic is very difficult to read and I don't know the characteristics of the output line on the IR receiver, but the capacitor, in combination with the variable resistor, will slow down the response of the relay to either turning on or turning off, reducing chatter or excessive...
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