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  1. Alec_t

    I'm Looking for a Simple Switching Solution

    If you have a pipe-stat monitoring the boiler temperature, when it opens the valve it could also switch off the immersion heater.
  2. Alec_t

    12v 5a PWM, how to test

    It depends on the supply construction, quality, type and method of rating (average or peak Amps). A linear supply will usually tolerate a short-duration overload without fuss if it's been conservatively rated, whereas a SMPS may struggle, die or have the smarts to go into shut-down if...
  3. Alec_t

    12v 5a PWM, how to test

    I don't see anything wrong with the connections. Those are the currents at normal running speed. The stall/start-up current will be several times those values, albeit for a short time while the motor gets up to speed, so could well be higher than the 10A current limit and cause the PWM unit to...
  4. Alec_t

    12v 5a PWM, how to test

    According to the ad the current limit is adjustable from 1A to 10A (although strangely the ad rates the unit as 15A ???). What is the stall/start-up current draw of the motor? If it exceeds 10A the unit may be shutting down to protect itself.
  5. Alec_t

    Please help me build a truly silent mouse.

    .... or optical?
  6. Alec_t

    electronics point experience anti-climax

    Duplicate deleted
  7. Alec_t

    electronics point experience anti-climax

    Wrong! Ideas/knowledge/designs/hints/tips/answers/help are constantly shared here. And have you checked the Projects Log section?
  8. Alec_t

    CD songs distorted badly first two or three songs.

    If the problem occurs with all CDs then I'd suspect the culprit is the mechanism which moves the read-head radially. Could be tacky/hardened lubricant causing excessive friction.
  9. Alec_t

    CD songs distorted badly first two or three songs.

    CDs can also suffer from age-related data loss, which can cause track skipping.
  10. Alec_t

    Adding accessory power to a DC power input?

    Just make sure that the added power consumption of the accessory doesn't overload the supply.
  11. Alec_t

    transistor base load

    Depends on the wire gauge :).
  12. Alec_t

    transistor base load

    Yeah. That brings the wire length down from 270,000km to only 135km :rolleyes:.
  13. Alec_t

    transistor base load

    Given the propagation speed of an electrical signal in a wire is about 90% of the speed of light you will need a wire ~270,000km long. :D
  14. Alec_t

    transistor base load

    Yes, I have.
  15. Alec_t

    Step up circuit 5 volt dc to (72 ~90 volt )

    The converter will draw nearly 0.75A -1A. How long can your powerbank provide that? An off-the-shelf DC-DC boost converter would likely be cheaper than trying to build one yourself.
  16. Alec_t

    Alternative long time 555 monostable

    If the right-hand circuit gave a substantially longer timing period than the more conventional left-hand one, using the same timing components, it would be very handy. However, it doesn't. The problem in getting long timing periods with either circuit is leakage current in high value timing...
  17. Alec_t

    Need recommendations for button/switch, springy and loud

    Something like this perhaps?
  18. Alec_t

    Polarity Switching

    The '31V' rating indicates the presence of a boost converter. If that 31V is AC then that explains how all LEDs could light.
  19. Alec_t

    Battery question

    That isn't a circuit. A circuit requires a complete go-and-return 'circular tour' for current to take.
  20. Alec_t

    Help : PWM generation

    Agreed. Post your intended HV circuit, including voltage, frequency and current particulars.
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