I have on this breadboard a circuit that is suppose to make a servo motor rotate 180 degrees and back again endlessly (for now - later it shall run 5 times and then stop)
This is something I put together myself after watching a "hundred" videos so please excuse the mess.
My idea is:
1. The first 555 (ne555) timer is sending a signal to the counter every 1.5 seconds with a duty cycle of 50%.
2. The counter (4017be) sends a signal to the transistor at output 0,2,4,6,8 and 10.
3. The transistor (BC547b) then sends vcc to the discharge pin on the last 555 timer which makes a PWM signal to control the servo motor.
4 When the transistor doesn't send vcc to the discharge pin on the last 555 timer then the discharge draws vcc with higher resistance to change the PWM signal.
And this actually work. BUT only when I pull up the yellow diode on the breadboard!
To see this circuit in action please watch this short video.
My guess is that there is not enough current to the base of the transistor to make current flow through the transistor?
This is something I put together myself after watching a "hundred" videos so please excuse the mess.
My idea is:
1. The first 555 (ne555) timer is sending a signal to the counter every 1.5 seconds with a duty cycle of 50%.
2. The counter (4017be) sends a signal to the transistor at output 0,2,4,6,8 and 10.
3. The transistor (BC547b) then sends vcc to the discharge pin on the last 555 timer which makes a PWM signal to control the servo motor.
4 When the transistor doesn't send vcc to the discharge pin on the last 555 timer then the discharge draws vcc with higher resistance to change the PWM signal.
And this actually work. BUT only when I pull up the yellow diode on the breadboard!
To see this circuit in action please watch this short video.
My guess is that there is not enough current to the base of the transistor to make current flow through the transistor?