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  1. duke37

    Video signal amplifier.

    You only need to match cables at the load end to stop reflections, then the cable looks like a resistor at the source Potential energy is mgh where g is 9.81 unless you are on the moon. I think you will need a lot of water high up in the forest canopy to store sufficient energy. Power will be...
  2. duke37

    Need help resistor values

    I would think that the BD140 is not necessary. T2 has to switch 44mA which most small transistors can manage. Look up the data sheets. I do nor remember all the numbers so I go for a 2N2222 which I can remember. Put the relay in T2 collector circuit. If you switch T2 fully on and off you will...
  3. duke37

    Trying to make a circuit diagram from this

    You must have had some sort of instructions to make the spaghetti.
  4. duke37

    current limiting to 2A Input 60V

    If the output vo;tage is above 60V DC then you need a boost convertor. If the output voltage is below 60V DC then you need a buck convertor. If the input/output is AC then you need a transformer.
  5. duke37

    home windmill reconfiguration questions

    1/4 hp = 136W out 115*2.1= 231W in and there is fan inefficiency (30%?) to take unto account. I suggest you do some sums.
  6. duke37

    Inline fusing 12v feed

    I do not think that the relay coil would be likely to take excess current. In my experience fuse failure is because rodents strip the wire insulation and the bare wire then rubs against the chassis.
  7. duke37

    home windmill reconfiguration questions

    You will only capture energy if the wind is blowing. Too little wind means the turbine will not turn, too much and the turbine will disintegrate. Most tubines have horizontal shafts but some have vertical shafts to use wind from any direction. You could try cutting a 40 gallon oil drum down to...
  8. duke37

    CAR LED headlight - load resistor (aka "CANBUS")

    I know very little about powerful leds. When running from a battery the supply will be steady. When the engine is started, the alternator will switch on and off as the battery is charged giving a variable supply. When the battery is fully charged, then the charge rate will be very low and the...
  9. duke37

    12vDC to 24vac module needs modification

    A 12V swing will show as 6V AC i.e. +/- 6V on an analog meter. What is the load? Is it a rectifier which selects the peak?
  10. duke37

    12vDC to 24vac module needs modification

    The two halves of the primary are inductively coupled so when one side is pulled to ground, then the other side rises an equal amount above the supply voltage. The transformer needs low leakage inductance between the two halves. I have used this system to run higher resistance speakers, Not a...
  11. duke37

    12vDC to 24vac module needs modification

    Or take the output from across the whole primary.
  12. duke37

    2 relays with a shared common

    Relays can vary a lot due to the requirements. Medium power relays often have silver contacts because of their high conductivity. Some relays have gold plated contacts for use on low voltage signal circuits, these should switch low voltage circuits only or the gold can be damaged and the relay...
  13. duke37

    220volt (EU socket) drill on 12 volt

    I have an electric drill and a battery charger. Drill B&D H364V-H15 240V 1.6A 370W Battery charger ABSAAR 12V fast setting. 240V in No smoothing. Meter analog 10.5V 0.4A Only runs at a low speed, about 1/sec. Stops with very little torque. There is a slight vibration. To get useful output you...
  14. duke37

    What are these ??

    I see a copper wire around the device so thought it would be a ferrite bead with the wire passing through twice. A closer look seems to see a fine wire wrapped around the RH lead but not soldered. Quite a conundrem, try a magnet to see if it is ferrite.
  15. duke37

    What are these ??

    A guess that the one on the left is a 100nF capacitor. The lower 'diode' looks like a wire wound on a ferrite bead to give a certain, possibly lossy inductance.
  16. duke37

    Fixed interval Jacob's Ladder?

    Yes. Glowworm have closed their production in Belper so I cannot now get details easily. The transformer should be able to stand an open cicuit or a short. It may not be happy to run continuously.
  17. duke37

    Fixed interval Jacob's Ladder?

    As an alternative to the neon transformer, you could try an ignition transformer from a gas or oil boiler. I imagine that these are scrapped when the boilers corrode and leak. Go see a friendly plumber.
  18. duke37

    Stator removal help

    Show a picture of the motor. You may be right and you show a stator but only if the body of the motor turns. There seems to be 16 poles and a commutator will have 16 segments. Where does the wire go that is resting on your hand?
  19. duke37

    Stator removal help

    I do not see a stator, only a rotor. I do not see a commutator, only a green yo yo. i would guess that they are assembled with an interference fit and will not come apart without damage.
  20. duke37

    what motor

    If the plate is supported by good bearings, then very little torque is required. A record turntable will do the job but I expect that you will need to set the speed,. If so, then you want a DC motor and a variable voltage power supply often known as a buck convertor. These are available cheaply...
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