Search results

  1. U

    Load control using PWM and temperature sensor

    If you don't mind can you please draw the schematic diagram for that,in my diagram +24v is changed with +12v. can you understand that, what am looking for. MOSFET is turned on when the 555 output goes high( using multimeter the voltage is displayed ) but it does not turned on the load.
  2. U

    Load control using PWM and temperature sensor

    Please have a look on my post(#10) on that am shown the circuit diagram,only change is instead of 2N2222 replaced with IRF740B MOSFET.on that +12v is connected with diode and drain,across the diode only am connected the load.
  3. U

    Load control using PWM and temperature sensor

    Hai Alec_t, Am also tried 12v for 555 timer but the problem is still present.
  4. U

    Load control using PWM and temperature sensor

    Schematic diagram is same as am sent earlier(load 24v am changed into 12v) instead of transistor replaced with IRF 740B N channel MOSFET load is 12V that is connected with load(drain),Gate is connected with PWM pulse,Sourse is connected with ground.
  5. U

    Load control using PWM and temperature sensor

    Hai Haralad, Using IRF 740B N channel MOSFET the functions is working, The problem is am giving 12 v in to the drain, when trigger the pwm input to the gate the drain gives voltage 12v (using multimeter able to see the voltage) but cannot turn on the even LED,what s the problem in this...
  6. U

    Load control using PWM and temperature sensor

    In above circuit light is replace with heater(low voltage), depend on the heat need to change the pwm output, like if we set upper limit is 65degree and lower limit is 40degree output is less than 40 degree means switch on the load,above 65 degree means switch off the load please help me on this...
  7. U

    Load control using PWM and temperature sensor

    Is there any possible to use other transistor, instead of 2N2222 ?
  8. U

    Load control using PWM and temperature sensor

    I mean that as per the circuit diagram 2N2222 works fine at one time only after that its not worked. 555 time worked properly so that the base of 2N2222 also triggered as 12v dc by 555 pwm, am checked with multimeter. load am used as lamp normally it works when connect direct 24v.
  9. U

    Load control using PWM and temperature sensor

    Here by attached the circuit diagram
  10. U

    Load control using PWM and temperature sensor

    This is the circuit diagram, the output of 555 timer is given to the driver circuit you have mentioned please refer the circuit using link for 555 pwm generator, load voltage is 24v and 500mA http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+5.023272298708815+64+7+50...
  11. U

    Load control using PWM and temperature sensor

    Hello Harald kapp, I have used 2n2222a transistor to drive the 24v load but initially it works but once switch off and then switch on the supply means that transistor not work at all, can you please refer any other transistor or any options waiting for your valuable comments.
  12. U

    Load control using PWM and temperature sensor

    am searched in google but did not get the circuit how to set minimum and maximum value of temperature am beginner, you have a lot of experience in electronics circuit could you please help me on this.
  13. U

    Load control using PWM and temperature sensor

    Thanks Harald kapp, For control the load your suggestion is nice and i want the temperature dependent circuit how to set minimum temperature set point and maximum set point(using comparator or integrator)please send me the circuit diagram.
  14. U

    Load control using PWM and temperature sensor

    Hai friends, I want some clarification or ideas regarding load control. Am using LM35 temperature sensor and depends upon the output of LM35 need to control the 24v load,my requirement is depends on the temperature on and off the load,when temperature below 45 degree on the load and above...
  15. U

    Time based control

    Thanks for the feed back, also i want temperature based control if temperature reach 75 degree cut off the input voltage and temperature decreases to 45 degree turn on the input voltage, i want to maintain the temperature in between minimum40 to maximum75 degree,please send me the circuit if...
  16. U

    Time based control

    Hai friends, I want to on and off the input voltage(like 12v to 24 v) based on the time like 1.3minutes on and 0.30seconds off the supply voltage(the time of on and off should variable i.e adjustable), let me know the sample circuit or solution for that. Please help me on this thanks in...
  17. U

    Best cheap material for diy low power heating element

    Hi Fish4Fun Am also tried this using Nichrome wire with 9vbattery() refer the youtube video but it doesn't heated and also tried in 12v Dc adaptor 15 Ohm nichrome wire(approximately 80cm length) nichrome wire where winded in wood like "s" shape in this case temperature increased, but am...
Top