I have a Relaxation Oscillator here. What I'm trying to do is to change the duty cycle of ca 50% to 10%.
What I thought of and tried to change R1 and C1 values so the time the capacitor loads and unloads changes. But it stays at ca 50%.
What I am trying to find is a way to change the duty cycle to 10%.
Best Answer
Charge the capacitor faster (or slower) than you discharge it.
For example, replace R1 with this:
simulate this circuit – Schematic created using CircuitLab
Now, when discharging (Vout low), D1 conducts putting R1 and R2 in parallel. This will reduce the period, but also increase the duty cycle (by decreasing the low period). If you wanted to reduce teh duty cycle, reverse the diode.