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 be used (two legs or three legs and wavelength)?
What type of LEDs should be used (green or red or yellow etc.)?
Why the potentiometer is needed between pins 1 & 5?
What potentiometer's specification (power) work?
I tried to make this circuit work by applying voltages ranging from (10-15)V and adjusting the potentiometer but the it only results in heating up the IC and potentiometer.
Any ideas
Thanks
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 be used (two legs or three legs and wavelength)?
What type of LEDs should be used (green or red or yellow etc.)?
Why the potentiometer is needed between pins 1 & 5?
What potentiometer's specification (power) work?
I tried to make this circuit work by applying voltages ranging from (10-15)V and adjusting the potentiometer but the it only results in heating up the IC and potentiometer.
Any ideas
Thanks