Hello gurus
I am trying to learn about PWM and got a circuit from here. Now I have assembled the components on a solderless breadboard. My first attempt did not work at all. I had checked everything I can think of. I started again from scratch, now it works but the pot isn't doing squat. The motor just runs. The motor I am using is this one. My question is simply: Is this schematic correct or am I doing something wrong? I must add that I'm not entirely sure what to do with the wiring around pins 4, 7 and 8. Currently, I've got the 10K resistor from the line where 7 is bridge to the line where 8 is, and then 8 bridged to 4, 4 bridged to +12v and then also bridged to ground with a 0.1uF capacitor. I don't know what the circles at pin 4 and the +3-18 at the top mean. Any help would be greatly appreciated. Thanks
I am trying to learn about PWM and got a circuit from here. Now I have assembled the components on a solderless breadboard. My first attempt did not work at all. I had checked everything I can think of. I started again from scratch, now it works but the pot isn't doing squat. The motor just runs. The motor I am using is this one. My question is simply: Is this schematic correct or am I doing something wrong? I must add that I'm not entirely sure what to do with the wiring around pins 4, 7 and 8. Currently, I've got the 10K resistor from the line where 7 is bridge to the line where 8 is, and then 8 bridged to 4, 4 bridged to +12v and then also bridged to ground with a 0.1uF capacitor. I don't know what the circles at pin 4 and the +3-18 at the top mean. Any help would be greatly appreciated. Thanks