Hi everyone,
New on this site and hope you can help me with this.
I found this circuit and tried to make it on a breadboard but it doesn't do anything but switch a LED on and off according to where I set the POT. Note I did replace the Light controlled resistor with a pot (tried several different ones). I have also tried several types of Voltage Controlled PWM circuits that are similar but have had no luck in making them do anything other then switch the LED on and off. Can anyone tell me what I am doing wrong? Maybe my expectations are not correct. Was thinking this would dim a LED as the pwm changed.
http://www.stephenhobley.com/blog/wp-content/uploads/2010/09/pwm_circuit_web.gif
Bill Bowden also has one that is similar:
http://www.bowdenshobbycircuits.info/page8.htm#func.gif
I am new here and hope to hear back. Just want to be able to control the brightness of LED's with out using a 555.
Charles
http://www.stephenhobley.com/blog/wp-content/uploads/2010/09/pwm_circuit_web.gif
New on this site and hope you can help me with this.
I found this circuit and tried to make it on a breadboard but it doesn't do anything but switch a LED on and off according to where I set the POT. Note I did replace the Light controlled resistor with a pot (tried several different ones). I have also tried several types of Voltage Controlled PWM circuits that are similar but have had no luck in making them do anything other then switch the LED on and off. Can anyone tell me what I am doing wrong? Maybe my expectations are not correct. Was thinking this would dim a LED as the pwm changed.
http://www.stephenhobley.com/blog/wp-content/uploads/2010/09/pwm_circuit_web.gif
Bill Bowden also has one that is similar:
http://www.bowdenshobbycircuits.info/page8.htm#func.gif
I am new here and hope to hear back. Just want to be able to control the brightness of LED's with out using a 555.
Charles
http://www.stephenhobley.com/blog/wp-content/uploads/2010/09/pwm_circuit_web.gif