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Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
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power supply
Good to hear. Once again, thank you all. This is my first time on these forums, but I think I will continue to hang around.- kjnangre
- Post #23
- Forum: Circuit design
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power supply
Yes, the only output is an LCD interface, there is no electrical connection with the outside other than the AC mains input. I considered measurement transformers, but size and cost are both critical design constraints for this project, and resistors beat transformers on both counts, hands down...- kjnangre
- Post #18
- Forum: Circuit design
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power supply
For the sake of clarity, I drew up a quick schematic: www.nangreaves.ca/ps1.jpg- kjnangre
- Post #14
- Forum: Circuit design
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power supply
Hey all. The resistors on the primary (R1,2,3) are just jumpers that allow the circuit to be configured for 120V or 240V while the transformer outputs 10VAC regardless. The case is plastic, and has no electrical connection. The ground symbol in the schematic just means my board's ground plane...- kjnangre
- Post #13
- Forum: Circuit design
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power supply
Because the secondary voltage of the transformer is a function of the current draw, which is not constant, so measuring the voltage here could not give me the high accuracy I need. Since my device has a 3-pronged plug, an improperly wired outlet is really the only way it could get plugged in...- kjnangre
- Post #7
- Forum: Circuit design
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power supply
Alright MacGyver, why don't you suggest an improvement then?- kjnangre
- Post #5
- Forum: Circuit design
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power supply
Thanks IRstuff. Part of my circuit (not shown) needs to know the AC voltage that is being applied to the board (this ia a power measurement device). That is done very simply by inserting a voltage divider across the AC live voltage and then into an A/D converter. But this forces me to tie my DC...- kjnangre
- Post #3
- Forum: Circuit design
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power supply
Hi, I have a simple power supply circuit (please see: www.nangreaves.ca/ps.jpg). This circuit supplies 5V for the rest of my board. The PS input is AC line voltage. If someone were to plug my board into the wall socket backwards (switching hot and neutral) then my whole ground plane would...- kjnangre
- Thread
- Replies: 22
- Forum: Circuit design
