Recent content by rogerm123

Appreciate all for the helpful input. I know now why I became a mechanical engineer vs electrical. Based on above I am going to change my strategy to try to detect the electric field or use neons to supply the logic to change the fuses. Thanks

Not familiar with Capacitive Potential Divider but I will research. Can you comment on proposed opto coupler use below?

one fuse is in series with the 115V supply as it first enters the charger. the other is is just before the output to the fence wire

I had not thought of that. Actually hand manual fence checkers do use a neon , or several neon bulbs with different resistors and a ground wire to stick into the ground to show the strength of the voltage pulse.

Some background. Plug in livestock electric fence chargers have to be protected from voltage surges(usually lightening related) coming in on the 115V side (1/2-1 amp, 240V fuse) and back through the fence side (1amp, 240V). When a storm comes through and if it blows a fuse; you could be...

Each hour I am checking a fuse to see if it is blown or not. I send a short duration voltage out and during this same duration look for the in pin being "high". All works well with the strategy until I actually turn on power to the fuse side. Yes (and I laughed as well) the chip smoked. 1. My...

Problem Resolved. Went back to 4 step vs eight step AND TIED DOWN THAT SERIAL IN PIN( a freshman mistake) Thanks all.

So instead of using the Toggle command to abbreviate the coding -not competent enough to really understand yet, I wanted to start off programming all four coils independently to learn how to do it. The driver board which came with the motor referenced above has a plug for the motor which has...

Looking at the diagram of the ULN2003; can someone explain what the notations "To 11,To10,To 4, and To1" are referencing? Also are the two bottom pins the supply to the motor? And finally shed some light on #6 out and #7 out? The motor is the 28BYJ-48. My first intro to steppers. Thanks

Works when after I installed 200ohm resister in series with buzzer.

I am just not sure of the amp draw. I assumed it would be more than the output pin could handle. You make a good point though-I may try to test it.

I checked the voltage across the the buzzer: -.237V when the MOSFET gate has 0V and same -.237V when the Gate has 4.75V from the 20M2 output pin. swapped buzzer leads and same thing. I am thinking to trash buzzer and buy a piezo unless there is an alternate transistor or reed switch that will...

I know this is going to be a generalized discussion but I am trying to get a read on whether my thoughts on the problem could be valid. First of all voltage is 4.75V. 20M2 B.6 pin is outputting to MOSFET gate. MOSFET is switching on. With no load through Drain/ Source the voltage is 4.75V when...

Good stuff. All of you are teaching me a lot. I think one of the most important thing is to always use good design practices to increase the robustness. I will incorporate Logic Level MOSFET's instead of power MOSFET's. I now understand the stray LED blip on start up that is not associated with...

Not been to that part of England but pics are beautiful. How did you come up with the value of C1-experience? Why would you need C2 then as it would be overshadowed by C1? Note I did not use electrolytic capacitors-does that matter? Also testing on the breadboard the MOSFET gate drained off...