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  1. M

    Light Meter Problem

    Hi, Has anyone got experience with this circuit? or can help me out with this? http://circuitswiring.com/bar-graph-light-meter-by-ic-741/ The LEDs do not light up as the intenstiy of light increases. The voltage tried ranges from (10- 15)V. My questions are: What type of phototransistor should...
  2. M

    Power Resistor As Heating Element

    Hi, A 25W/12 Ω resistor is to be used as a heating element. It is desired to get it hot up to 100°C. The questions are: Can it be connected directly to the output pin of a microcontroller (which can only output upto 5V) or an additional cicuitry is required (for more voltage and current)? How...
  3. M

    Problem in a circuit?

    Hi, I have a question regarding the sub section of a power supply. Background: I have two similar power supplies one is functioning whereas the other one is not functioning. The functioning one can output variable dc voltage from +(0 - 20)V. The nonfunctioning power supply can only deliver -4V...
  4. M

    Power Supplies Problem

    Thanks for the reply. Yes, these are two different supplies. The input is common (220-240)V 50/60 Hz. The dc output voltage range is from (0-20)V. These are semiconductor based.
  5. M

    Power Supplies Problem

    Hi, Two power supplies are malfunctioning. Both have problems with their variable DC output voltages. The DC output voltages can be varied using a potentiometer. The first supply gives a fixed negative output (which is much lower than the maximum +ve output obtainable) for all possible values...
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