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  1. Alec_t

    Help with 555 latch circuit

    Try reducing the 100k to 4.7k. You may then need to increase the 1uF to, say, 22uF.
  2. Alec_t

    24V Electromechanical Relay-sparks but doesn't switch

    In the highlighted bits of the pic below, 1) is that a scorch mark on top of the cap? 2) is the resistor open circuit?
  3. Alec_t

    Oven playing up

    Not sure what you mean. Nothing connected to any pin, or no voltage on or between any pins? If the tranny has a fault I think you're out of luck, as it's got non-standard secondaries.
  4. Alec_t

    Oven playing up

    Welcome to EP. I'm guessing a Whirlpool oven? I agree the yellow thing is a transformer. It looks to have suffered heat damage and may well have caused the failure of the other parts. Unless you know its specification you won't be able to replace it. Since several parts have failed it is likely...
  5. Alec_t

    Electronics on race bike. (6 to 12 Volts conversion)

    Any belts/pulleys/gears/shafts in the transmission may also need to be upgraded if you want to use a 12V motor which provides more torque.
  6. Alec_t

    LM339/LM339N can't get output high

    Agreed. And unused outputs should be left open-circuit. Don't be tempted to short those to anything.
  7. Alec_t

    need to illuminate some digits to see at night

    Welcome to EP! Could you perhaps have a series of raised marks (e.g. blobs of hot glue) to indicate position by feel rather than sight?
  8. Alec_t

    How can fix 24v /80amps battery charger voltage drop while connect load-pls help

    Welcome to EP! Can you post a link to the charger's specification/datasheet/advert?
  9. Alec_t

    Water tank sensor

    Did the old reed switch connect between its LED and 12V (+) or between the LED and ground (-) ?
  10. Alec_t

    LTspice issue.

    In Control Panel/Drafting Options, make sure 'Automatically scroll the view' is disabled.
  11. Alec_t

    555 timer self reset

    So why do you have a 7V supply?
  12. Alec_t

    555 timer self reset

    Voltage at which point? Please be more specific with your responses. You need to set your logic parameters to suit the type of OR gate you are using. For a CMOS gate the switching threshold will be about half the supply voltage, i.e ~3.5V with a 7V supply. Logic output high will be 7V.
  13. Alec_t

    Removing ground cable off mini servos?

    Maybe, if you can get the case apart without damage. Some RC servos are of the type which can rotate continuously (e.g. for driving winches on ship models), others can move only through a limited angle. The latter type (which you have) have a feedback potentiometer which limits the rotation...
  14. Alec_t

    Comedy Thread

    It certainly explains why I only discover my typos after I've sent a message !
  15. Alec_t

    motor speed controler issue

    What sort of insulation did they have? If they were bare copper and happened to short together, even briefly, the circuit could have suffered from excess current.
  16. Alec_t

    Unexpected result of IR2110 for the purpose of Class D amplifier

    Here's the revised IR2110g model. Change the file extension from .txt to .sub.
  17. Alec_t

    Unexpected result of IR2110 for the purpose of Class D amplifier

    I agree with Harald about Hin and Lin values. Also, if Vdd is 12V the Hin and Lin signals need to reach more than half that to be recognised as 'logic high'. The IR2110g model you list is an old version of mine. I'm working on an update which should behave better.
  18. Alec_t

    I'm Looking for a Simple Switching Solution

    Use a boiler pipe-stat which has a SPDT switch and closes the NO contact when the boiler is hot. The NO contact enables the valve. The NC contact enables an SSR to activate the immersion heater.
  19. Alec_t

    12v 5a PWM, how to test

    You don't have to remove the armature. Test from the leads. Run the motor briefly. Test again. Rinse and repeat. The idea is to average measurements which differ due to inconsistent brush contact with the commutator segments.
  20. Alec_t

    Hello and help!! (need circuit to see if a pump did run)

    Does your sump pump have a float-switch to trigger its operation? If so you could have the float movement operate a mechanical flag.
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