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  1. ramussons

    Inverter Transformer

    The simplest way - Get a 220 to 24 Volt transformer. Else you will need to wind a transformer with a 1:1:2 winding ratio.
  2. ramussons

    Feeding a SMPS from 2 different power sources

    A SMPS unit has a EMI Suppression Filter followed by a Rectifiers to get a DC. It is this DC voltage that is switched ........ etc. A typical input schematic is attached. If the issue is choosing between the Mains and the E/A, a simple 2 Pole 2 Way switch (or relay) does the job. But if you...
  3. ramussons

    Transformer

    Hmmmmm.... That's Rule of the Blister :D
  4. ramussons

    connecting LEDs in series

    For your simplistic understanding: LED's don't behave like resistors - they don't follow i=v/r. Once they light up, the variation of current is very large for a small variation of voltage making it practically impossible to control the current and limit it to avoid a burnout. So you use a...
  5. ramussons

    Transformer

    It would depend on the transformer rating and its loading. By a rule of thumb (literally :D) - if it's too hot to touch, it's bad; warm is acceptable. And my thumb and your thumb can have its own definition of "hot".
  6. ramussons

    Turns ratio.

    Yes Voltage and current ratios have Linear relationship to turns ratio Impedence ratios are "squares" of turns ratio.
  7. ramussons

    Absolute Maximum Values

    There is another important parameter missing - The maximum collector current - 3 Amps. All the 4 are inter related. It will not be possible to operate the device with all parameters together at their limit. For eg; you cannot have Ic at 3 Amps AND Vceo = 100 Volts - the Pd would be 300...
  8. ramussons

    Phase control Shaded pole motor

    No, it does'nt require 2 snubbers. The point I'm making is the pin 4 of MOC3021 is to be connected to the "anode" of the triac, not to the snubber.
  9. ramussons

    Phase control Shaded pole motor

    Replace R2 with 270 ohms and connect it to the anode of the triac instead of from the snubber.
  10. ramussons

    IC heating problem while using 24 volt smps

    :eek:o_O
  11. ramussons

    IC heating problem while using 24 volt smps

    Give you a lead http://www.digibay.in/lm2577-dc-dc-adjustable-step-up-power-converter-module Google for more
  12. ramussons

    Combining two ac sources rectifier

    You better start a new thread. "Feeding a SMPS from 2 different power sources"
  13. ramussons

    Power a cell phone with solar power.

    A rule of the thumb would be: if the phone sustains on its 1700 mAH battery for, say, 8 hours, 4000 mAH will last for 16 hours, 8000 mAH for 30 hours. So the size of the battery will depend upon how long you want the phone to "run" all by itself. The battery also needs to be charged, and the...
  14. ramussons

    Water Level Sensor

    I think Kiwi is right :)
  15. ramussons

    Inverter issues

    Dear jonty, without access to minimum of a Multimeter, it will be difficult to solve your problem. We don't even know if there's a problem.
  16. ramussons

    IC heating problem while using 24 volt smps

    Why a SR for 14 Volts? (doubt if it's available anyway :rolleyes:) Why not 12 volts itself? Any Linear regulator WILL dissipate heat. If your regular source is 24 Volts, it is better to get standalone SR's for 12 and 5 volts. It can be used to power other projects too, in future.
  17. ramussons

    Water Level Sensor

    That's a thermostat that breaks the heater supply. This is normally wired in series with the heater; in larger steam generators, it my be controlling a Relay which, in turn, switches ON / OFF the heating element.
  18. ramussons

    Combining two ac sources rectifier

    Frequency and Phase is no issue. The setup behaves like 2 standalone power supplies Why the isolation? Is it an issue?
  19. ramussons

    Combining two ac sources rectifier

    Use isolation transformers it should work fine. Careful with the high voltage though.
  20. ramussons

    IC heating problem while using 24 volt smps

    You are using a 24 volt power source to feed a setup that requires 12 volts and 5 volts. You ARE going to dissipate a lot of heat - your choice to dissipate it in 78xx regulator or a resistor. The solution is to get Switching Regulator(s) that gives you 5 and 12 volts output from 24 volt input.
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