I need help understanding the attached schematic. I am a noob and while I do understand the basics, I can’t figure out how this works. Hoping to get some help, more detailed the better.
What I do know:
I numbered the components because they are hard to read in the picture. Here they are
- 1K resistor
- 470 resistor
- 2N4403 transistor
- 1N4004 diode
- 56 resistor
- 2.7k resistor
- tip102 transistor
- 220 resistor
- tip36c transistor
- 1N4004 diode.
I am pretty certain that the VCC is 5VDC regulated. The line coming in from the far left is the control line that I also believe is high or low 5VDC. I will do some more testing when I get a chance, but lets assume that is the case.
The line coming in from the right is +50VDC.
This circuits sole purpose is to supply a path to ground for a high power coil/solenoid. The coil has a diode on it for protection against spike voltage.
I would like to understand this much better, and maybe it can help some other folks too. Lets just say there is very little here I understand and go for the most complete explanation possible. My ultimate goal, aside from learning and understanding this, is to mimic the functionality with the Arduino as the control. I may mimic it exactly to see it all work, but if there is a better way please share.
Thank you very much for any help you can provide.