docscott999
New Member
I am an amateur in electronics but I know the basics. I am trying to create a circuit with an on time of about 1s and an off time of about 8min. The circuit I have attached is supposed to allow this with the potentiometers. However with the potentiometers the on and off time are about equal, that is on/off of more than 4 min regardless of where I set the pot dials to.
Without the pots, I get an on time of about 4.6s and off time of about 1.2s. I know I need a duty cylce of less than 50% but putting a diode across R4 does absolutely nothing. I have read that the diode should allow my to get a duty cycle of <50%.
I don't know enough as to what to do next. Can anyone help me achieve the values I need of a time on of 1-2s and a time off of 8-10min?
R3 = 1K Ohm
R4 = 390 Ohm
C1 = 4,700 mF (electrolytic)
R1 = 100K Pot
R2 = 10K Pot
Without the pots, I get an on time of about 4.6s and off time of about 1.2s. I know I need a duty cylce of less than 50% but putting a diode across R4 does absolutely nothing. I have read that the diode should allow my to get a duty cycle of <50%.
I don't know enough as to what to do next. Can anyone help me achieve the values I need of a time on of 1-2s and a time off of 8-10min?
R3 = 1K Ohm
R4 = 390 Ohm
C1 = 4,700 mF (electrolytic)
R1 = 100K Pot
R2 = 10K Pot