Search results

Search Forums New Posts
  1. B

    weatherproof, low-current mini LEDs on long leads?

    Solar cells only work during the day. If you connect a battery and use the solar to charge the battery, the LEDs can be almost anything you want so long as the battery has the capacity and the solar cells are selected to recharge that amount in around 4 hours of daylight.
  2. B

    Please identify the bulb.

    That type of socket should not have any connection to mains supply. As far as I can see it is a ceramic base for an mr16 12v dichoric lamp.
  3. B

    12V DC Motor (RS-550PC-8516) had some problem

    Probably because you've cooked it. The PC in the part number refers to 7.2v motor. I'll bet you had some revs out of it for a short time....:eek:
  4. B

    Auto reversing polarity after a few milliseconds (for solenoid control)

    Taken from the specs........ Magnetically Latching 2 Way 2 Position Solenoid Valve ACTUATION: A short 6 Volt pulse lasting only 50ms can open/close the valve As for whether or not it requires reversing the coil power, it would depend on the internal mechanism. I remember the old "bed lamp...
  5. B

    Project for interested novice that will give him most taste of electronics?

    I agree with Bob. You could try here as a start... http://www.talkingelectronics.com/te_interactive_index.html
  6. B

    90v/100a DC Power Supply

    Running those types of loading off the mains may well just attract the attention of the local supply authority. Have you considered approaching them beforehand to get their ok...? Just that they normally don't take too kindly to large surges that their equipment may not be able to handle and...
  7. B

    LM317 2N3055 Variable Circuit Problems

    mmm...always pays to check....preferrably before you apply the juice
  8. B

    LM317 2N3055 Variable Circuit Problems

    Top drawing shows what you have in block form. Lower drawing shows what is inside the "block". Hope those needles are still handy .......................:)
  9. B

    90v/100a DC Power Supply

    Maybe use lead acid batteries. They can handle large initial currents. Then re-charge from mains supply. Another avenue is perhaps the new breed of batteries developed for the off-line solar grids currently beginning to appear (especially in Australia). As usual on here, if you were to present...
  10. B

    Toroidal Transformer

    It might just be something as simple as a dodgy headphone socket. Seen that before. Inside the socket there will be miniature contacts that direct the audio either to the headphones or the main amp. The crackling sound you referred to earlier sort of points that way.
  11. B

    Scoreboard

    Here's the thing....you can see what you have but no one else can.o_O And I doubt many here will try to stand on their head to look at your drawing.
  12. B

    Current activated relay with timer

    Why cut-in to the circuit, only need to plug microwave into a timer. Plenty of them around. Reset at each operation.....easy. Plus no pensioner is going to be able to re-program the timer, they will need a four year old for that. :)
  13. B

    Auto reversing polarity after a few milliseconds (for solenoid control)

    You could use 2 simple single pole momentry changeover switches(microswitch for example) Other than that the H bridge I mentioned in #2 if you plan to run a microcontroller for some such reason.
  14. B

    Faulty power supply

    Sorry but miss your point. Spec says 13 and so does 2nd photo in post #1.
  15. B

    Very slow sewing machine motor operation.

    Like so........
  16. B

    Can I Modify this Relay switch?

    Should be ok.....specs say SPDT ...coil is 270r......what is existing?
  17. B

    Auto reversing polarity after a few milliseconds (for solenoid control)

    Hbridge.......but there will be other considerations you probably haven't thought about.....inductive reactance ....time for solenoid to physically move being just a couple....i doubt the armature will get very far in a few milliseconds
  18. B

    Simple millivolt to 5V amplifier module

    AD623.....instrument amp module here ............. http://www.ebay.com/itm/DC-Millivolt-Micro-volts-Instrumentation-AD623-AD620-Signal-Amplifier-Module-/252443031864
  19. B

    Simple millivolt to 5V amplifier module

    This seems to be along the same lines ....http://electronics.stackexchange.com/questions/39303/scale-30-50mv-signal-to-0-5v-range
  20. B

    Simple millivolt to 5V amplifier module

    What would output be for a 1K resistor? Bit conflicting info as the spec says it outputs 9 to 13mV in air. Do you need it to trip a circuit or more range as Arduino analog input will convert 0-5v into 0-1023. Other than that a standard opamp should do it.
Top