Oct 15, 2007 #1 F faraz101 Full Member level 1 Joined Mar 7, 2007 Messages 96 Helped 7 Reputation 14 Reaction score 5 Trophy points 1,288 Activity points 1,872 i have build 555 timer pwm circuit and i am varying the motor speed with the variblre resistor b/w pin 7 and 6.but i want to control the speed form external analog voltages which ranges form 0.80v to 1.20v. any ideas thanx
i have build 555 timer pwm circuit and i am varying the motor speed with the variblre resistor b/w pin 7 and 6.but i want to control the speed form external analog voltages which ranges form 0.80v to 1.20v. any ideas thanx
Oct 15, 2007 #2 A A.Anand Srinivasan Advanced Member level 5 Joined Oct 15, 2005 Messages 1,792 Helped 257 Reputation 514 Reaction score 39 Trophy points 1,328 Location India Activity points 10,678 pwm 555 the control pin5 can be used but a amplified version of the 0.8 to 1.2V signal would be needed as far as i know....
pwm 555 the control pin5 can be used but a amplified version of the 0.8 to 1.2V signal would be needed as far as i know....
Oct 16, 2007 #3 F faraz101 Full Member level 1 Joined Mar 7, 2007 Messages 96 Helped 7 Reputation 14 Reaction score 5 Trophy points 1,288 Activity points 1,872 555 timer pwm circuit i already work on it but it is not giving a wide speed range.coz pin5 already have some voltage about 3v. thanx 4 reply
555 timer pwm circuit i already work on it but it is not giving a wide speed range.coz pin5 already have some voltage about 3v. thanx 4 reply
Nov 15, 2007 #4 U ultrabrains Full Member level 2 Joined Feb 14, 2007 Messages 128 Helped 12 Reputation 24 Reaction score 3 Trophy points 1,298 Activity points 2,152 555 pwm you can connect a resistor to ground to reduce the voltage on pin5 . i worked on it a long time ago and i used a transistor circuit to pull th evoltage at pin5 to ground and it did work well cheers
555 pwm you can connect a resistor to ground to reduce the voltage on pin5 . i worked on it a long time ago and i used a transistor circuit to pull th evoltage at pin5 to ground and it did work well cheers
Nov 15, 2007 #5 A A.Anand Srinivasan Advanced Member level 5 Joined Oct 15, 2005 Messages 1,792 Helped 257 Reputation 514 Reaction score 39 Trophy points 1,328 Location India Activity points 10,678 555 pwm circuit pin5 will have a voltage because it is part of a internal voltage divider.... it can be varied externally according to our need....
555 pwm circuit pin5 will have a voltage because it is part of a internal voltage divider.... it can be varied externally according to our need....
Dec 2, 2007 #6 Y yogi Full Member level 6 Joined Jan 8, 2005 Messages 336 Helped 22 Reputation 44 Reaction score 5 Trophy points 1,298 Activity points 2,177 pwm with 555 if you are using potentiomenter, then you require just one potentiometer and a diode with 555 astable multivibrator circuit http://www.geocities.com/njbibin/robo14.html Bibin John www.bibinjohn.tk
pwm with 555 if you are using potentiomenter, then you require just one potentiometer and a diode with 555 astable multivibrator circuit http://www.geocities.com/njbibin/robo14.html Bibin John www.bibinjohn.tk