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  1. J

    A diode for my heating/hot water?

    Well I am confused because all systems I have worked on don't use a timer. I get what your saying, but I don't understand why anyone would want to do that and as you have stated, makes temperature control less efficient because your wasting energy on unused hot water by being forced to run the...
  2. J

    A diode for my heating/hot water?

    I'm still not sure how the thermostat is working in this instance. Can you take a picture of the thermostat wiring and label the picture so I can draw a mental picture. This system seems ass backwards to all the ones I have worked on so maybe my opinion is not correct. Let's just assume for the...
  3. J

    A diode for my heating/hot water?

    Well because quite rightly you don't explain anything. I assumed your HW controller was not a timer. If you call a timer a HW controller, then that is my confusion. As stated by duke, you can not run the relay coil in series with the pump. So that will need be in parallel. Thirdly, your...
  4. J

    A diode for my heating/hot water?

    I understand this and it should be valid if the OP is in the UK. But where I live you can make any modification you want to any system in an existing structure (occupied) without having it approved by code enforcement (electrical, gas, water, waste.) The only time it would matter is when you are...
  5. J

    A diode for my heating/hot water?

    Parallel? If I remember correctly you can buy multiple zone controllers, one thermostat per zone, but why not use one thermostat with a two zone controller. Just tie the thermostat to both zones on the input. The output of the CH controller is probably not mains voltage, but the OP says it is...
  6. J

    DC Power Supply (5V 10A) - Questions

    If you look around you might be able to find a switchmode IC circuit that would only require a few external parts.
  7. J

    A diode for my heating/hot water?

    Here is what I had in mind. The relay will be energized when the CH pump comes on, this is why the coil of the relay is in series with the CH controller and the CH pump. Then on the other side of the relay, the NC (normally closed contacts) will be in series with your HW timer and the HW boiler...
  8. J

    A diode for my heating/hot water?

    You still haven't answered my question. Does this system have a domestic hot water supply? Your drawing labels "HW Boiler". This confuses me, because most boilers I know of don't have storage tanks. You are not using a hot water tank as a boiler (for your central heating) and a domestic hot...
  9. J

    multi direction dc motor

    http://www.adafruit.com/products/81 Or just buy a L293D
  10. J

    A diode for my heating/hot water?

    So leave the HW on 24/7 and then use a relay that is triggered by the valve power to control (turn on, 'NO' side of the relay) the HW power. Done deal and it shouldn't cost you an arm and a leg. A relay will not draw that much extra current to close under mains voltage so I wouldn't worry about...
  11. J

    Question on step motor control

    Can you take a picture of the board? It is probably the driver for the stepper.
  12. J

    Question probably gets asked a lot but, where do I start?

    start to look up circuits that come with helpful explanations. Find simple circuits and study them, it will become clear when you try to modify a small circuit to suit your needs. That is when you can turn theory into practice. You could always try out a legend, reading is slightly advanced...
  13. J

    Death by electricity

    coulombs is the electrical charge present, which we measure as the Ampere. Joules is coulombs of charge over a time period. Watts is unrelated as it is the measure of power which is volt * amps. Again. it is the current that fibrillates the heart. It is this action that will stop the heart...
  14. J

    Death by electricity

    Recently I been rewiring main disconnects and running new wires from the meter box to the main disconnect while the incoming wires are still hot. There is no better advice when you are working around un-fused mains. Yes, 240V does hurt like hell. I got nailed being a novice working on an...
  15. J

    resistor should be renamed lol

    resist not only sounds better but it describes the physical nature of the resistor to the electron. AFAIK resistors oppose the flow of electrons which in turn cause a voltage drop and produces heat as a bi-product. The electrons aren't confined or limited in anyway and they do not disappear.
  16. J

    One switch two light bulbs.

    Did you actually read anything besides the title?
  17. J

    will gfci work on ungrounded circuit?

    I am certainly not the foremost expert, so my advice is just that. Ground Fault Circuit Interrupt trips the power when the current through the hot side of the circuit does not match the current through the neutral side of the circuit. This is an indication of a ground fault. (IE from the hot...
  18. J

    LED problem

    like this
  19. J

    Fire alarm RF interference susceptibility

    out of curiosity have you turned the transmitter back on without anyone knowing it to verify the issue still persist. Some always try to find fault whether it exist or not. Could have just been a big coincidence though unlikely.
  20. J

    AC to transistor in tuner circuit

    The microphone would be producing DC current I believe, it is the voltage that would be fluctuating from max Volts to 0 volts. If that is the case you could use a small amplifier to increase the signal voltage to operate the rest of the circuit properly if needed. As I don't believe the power...
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