Thank you for the lesson in furnace repair. I'm an electronics tech, and haven't worked before with things like flame detection circuits. Unlike furnaces, when our equipment has flames shooting out it's time to unplug it fast. BTW, the diode is a 'one' N4004, not an eye' N4004. The 'one' means the device has a single semiconductor junction, (making it a diode,) in the same way that a 2N device is a transistor, with 2 semiconductor junctions. I explained that as diplomatically as possible to an engineer I worked for, thinking he would appreciate knowing that so he wouldn't sound ignorant among other engineers, but he got very offended. However, It's part of a tech's job to be honest with the engineers, so after being told I was wrong and never to question his knowledge again I gave him my 2 weeks notice and found another job.
Can you go over in detail how you orient the diode before connecting it, and also exactly where you place each end of the test wire on the board together with the meter leads. As you said in the video, if you connect it wrong, the test won't work 😊
It simulates the much smaller current flow in the reverse direction. The flame actually conducts in both directions, it just conducts much better in the "forward biased" direction. So the *net* current flow has a DC component.
Thank you for the lesson in furnace repair. I'm an electronics tech, and haven't worked before with things like flame detection circuits. Unlike furnaces, when our equipment has flames shooting out it's time to unplug it fast.
BTW, the diode is a 'one' N4004, not an eye' N4004. The 'one' means the device has a single semiconductor junction, (making it a diode,) in the same way that a 2N device is a transistor, with 2 semiconductor junctions.
I explained that as diplomatically as possible to an engineer I worked for, thinking he would appreciate knowing that so he wouldn't sound ignorant among other engineers, but he got very offended. However, It's part of a tech's job to be honest with the engineers, so after being told I was wrong and never to question his knowledge again I gave him my 2 weeks notice and found another job.
Can you go over in detail how you orient the diode before connecting it, and also exactly where you place each end of the test wire on the board together with the meter leads. As you said in the video, if you connect it wrong, the test won't work 😊
If the current rectifies and passes through the diode, what is the purpose of the 10ohm pull down resistor?
It simulates the much smaller current flow in the reverse direction. The flame actually conducts in both directions, it just conducts much better in the "forward biased" direction. So the *net* current flow has a DC component.