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  1. Y

    How is transformer impedance selected here:

    I've seen a speaker (4 ohms) connected to a 4: 25,000 ohm input transformer . The 25K side is in series with a 500K pot which the center tap feeds the grid of a 6AV6 tube/valve. This is for an intercom circuit. I'm wondering how the transformer ratio and pot values were...
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    Mains Timer off delay

    http://www.digikey.com/catalog/EN/partgroup/7000-agastat-series/26424?WT.srch=1&mkwid=sq28JzMIj&pcrid=62954599395&pkw=_cat:relays&pmt=b&pdv=c
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    Mains Timer off delay

    I typically use Agastat brand Electropneumatic timers. When power is applied to the coil the plunger moves to charge a pneumatic cylinder. Timing is adjusted via a variable orfice. The compressed piston of the cylinder, pushes against an opposing spring attached to the...
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    Wanting to build a rectifier circuit for my lawnmower.

    It sounds like the charging circuit is not working. Possibly the clutch coil has a shorted winding, drawing too much DC (current) discharging your battery faster than it can be charged. The rectifier could be shorted, delivering some AC to the clutch coil: it could be...
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    Fallout Relay - Redneck Varistor

    480VAC single phase with a 100V voltage drop is very bad. 10-15% is pushing the limits. Do you not have 3 phase power available? On 3 phase systems I've seen Bassler Phase and voltage detector relay used. Used on transfer switches between purchase power and Gen-set...
  6. Y

    stranded wire max.current

    For Stranded or Solid Standard Single Conductor PVC insulated tinned -copper wire, passes UL VW-1 Vertical flame test, CSA Certified, 300 VAC(UL 100701569): 26 AWG 5A 24 7 22 10 20 13 18 18 16 24 14 33 12 45...
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    Confused about antenna balun

    The indoor, set top, antennae you have is a dipole type, with a transformer or resistor network to match a nominal 75 Ohm to 300 Ohm. The cable coming from the housing appears to be 300 Ohm balanced line. *The use of balanced (symmetrical feed) or unbalanced (unsymmetrical feed)...
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    How to safely wire or utilize a switch

    Sorry But your wrong. A GFI works by measuring current in only the current carrying two legs: L1 and L2. It does not use the safety ground for operation. It uses differential measurement. This is what makes it perfect for the application above.
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    How to safely wire or utilize a switch

    One goood way to prevent shock would be to buy an inline GFI (Ground Fault Interupter)., and install at the plug end of your appliance.. You see thjese on Mains powered pressure washers, and other equipment used outside and/or around water.
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    Help with heater

    I have a similar heater. Mine has two settings 600W and 900 W. The heating elements are switched so you can have either or both. ( In parallel.) and then in series with a thermostat. I replaced the two push switches with heavy duty toogle switches., making sure they...
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    Cathodic Protection

    I agree. Inside the tank an anode provides current through the electrolyte to the inner lining. On the outside an anode in the ground provides current through the soil (electrolyte) to the outside of the tank. This is the best I can explain it:; hopefully I'm right...
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    Wiring a fan

    IMHO and most all of us have one, burning one's house down due to a simple branch circuit overload isn't likely if your service is adaquately protected by fuses or circuit breakers . While this is true in most of the United States, other parts of the world may not hold true...
  13. Y

    Wiring a fan

    I used the term return conductor instead of grounded return condutor, because that what it is in this case (ungrounded). I hate the tern neutral, designated as the letter "N". It normally carries current and is live. The ground conductor is for safety and shouldd never...
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    Cathodic Protection

    Yes, I can see that. But what would be the difference whether protecting the inside or the outside (common wall) tank. We could attach to the outside to an anode . If we are replenishing electrons to the metal ; isn't the same metal on the inside as the outside? (just that...
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    Wiring a fan

    LMAO! No offense taken. Makes me go back and think, as I said in my first post, maybe he mistakenly is replacing a 220 V fan with a 110 model. Then a neutral (or return current conductor) would apply. On the right side of the terminal strip if you connect the blue...
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    Question for BNC terminator.

    I'm lucky if I can see the pin at all.
  17. Y

    Wiring a fan

    Could be deadly, but not in this case. The motor does not care since it is 220v impeadance protected and not referenced to ground. Glad we agree to disagree. I'm done.
  18. Y

    Wiring a fan

    Very Good Gentlemen. If you read my reply I suggested he check the voltage with a meter. trying to help this guy with limited information. These are the steps i suggest , as i would do my self. I am not a licensed Electrician in Austraila, but I am familar with their...
  19. Y

    Wiring a fan

    I understand where your coming from. When I moved into my current 150 year old house I discovered all the wall outlets were surface mounted on the baseboard with #20 zip cord. As for answering the prevous post. Even a licensed electrican will have to make some...
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    Question for BNC terminator.

    There are physical dimensional differences but not to my naked eye. I recently ordered both 50 and 75 ohm connectors and they have manufactuer's type numbers engraved on each piece. This is the only way I can tell them apart. There are many ddiffernt part numbers so I...
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