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  1. Alec_t

    Two power sources

    Just curious: what is this 0.1V 30A source?
  2. Alec_t

    DIY Audio Amplifier???

    To design an amp you need to start out with clear specifications of the amp's capabilities and parameters, such as RMS power, signal input level, supply voltage(s) available, load impedance, bandwidth, tolerable distortion level, .....
  3. Alec_t

    Airflow detector

    I'm sure that's workable, but I'm surprised you abandoned the original idea of using the two thermistors as a potential divider? That divider plus a trimpot could make a DC-energised bridge. A single opamp could detect bridge unbalance.
  4. Alec_t

    Getting output from sensors on an android device.

    Googling "android phone control motor" gets you some starting points. RFOBasic can be used to create an app to access sensor data.
  5. Alec_t

    fm transmitter using colpit oscilator

    That works for AM, but the OP specifies FM?
  6. Alec_t

    fm transmitter using colpit oscilator

    Why does phase inversion matter? The phase of any audio signal is continuously changing; an extra 180 degrees is of no consequence.
  7. Alec_t

    Oscillator or Not?

    What is the purpose of the bar when exposing seeds to an EM field?
  8. Alec_t

    Battery life on full load help?

    Battery chemistry, safe discharge level.
  9. Alec_t

    555 timer problem

    Use a capacitor on the Trig input, like this:
  10. Alec_t

    Help with AVL cricket

    Since they offer the manual for sale I doubt they'd make an online copy freely available ;).
  11. Alec_t

    How much of a Short circuit is too much?

    How small are your 'small batteries'? It takes a lot of current to heat a short length of nichrome wire to even a low red heat; maybe more than your batteries (which inevitably have internal resistance) can provide.
  12. Alec_t

    3W solar garden light help.

    Personally I'd go for a small SLA (gelled electrolyte LA battery).
  13. Alec_t

    Help with AVL cricket

    This site offers a manual.
  14. Alec_t

    Model Railway elevator

    Can you source actuators with built-in position-encoders?
  15. Alec_t

    3W solar garden light help.

    The battery is presumably a three-cells-in-series one and will need special charging/discharging control to avoid fire or explosion and to keep the cells balanced. So a dedicated charger/balancer will be required. The one in the link doesn't seem to have any call balancing ability, since there...
  16. Alec_t

    Latching Circuit npn/pnppnp

    The top transistor is upside-down. It shouldn't work in the simulator unless the sim is modelling reverse breakdown.
  17. Alec_t

    Defective PCB/scroll saw

    Whichever you believe, it certainly looks like the transformer has had it :(.
  18. Alec_t

    LTspice 4 Trouble With Transient Simulation Reults

    LTspice doesn't accept zero for the rise or fall time and will substitute its own times (0.1 sec in your case, which is what your graph shows). Replace zero with a practical value, e.g. 1u.
  19. Alec_t

    Killing SSR (relays) - Need to understand

    That doesn't allow much margin. However, if the SSR is popping when there's no load current the problem is presumably with the driver.
  20. Alec_t

    LTspice 4 Trouble With Transient Simulation Reults

    Post your asc file, so that we can see the voltage source parameters and where you're 'Vout' point is.
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