Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations MintJulep on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Search results for query: *
- Users: stephenjvb
- Order by date
-
Solenoid valve drive with a PLC
It may not need mentioning, but when you drive solenoids a back swing diode should be put across the coil or you may damage solid state outputs. Some solenoid drivers already have this. I have found that in addition to a diode a small ceramic cap (100 nF or 0.1 uF) in series with a 2 to 5 ohm...- stephenjvb
- Post #14
- Forum: Programmable logic controllers (PLC)
-
reverse biased mosfet
I just learned that this IS an elegant circuit. I was told in college oh so long ago that mosfets were polarized devices like transistors (I think by a Professor appropriately named Looney). This is functionally true. However if the gate is positive with respect to the source current can flow in...- stephenjvb
- Post #7
- Forum: Circuit design
-
Siemens latency
Maybe I'm missing the point and I'm not familiar with these processors but you could simply toggle a bit in one processor, have a remote processor copy the bit to a second bit and time how long it takes the first processor to see the changed 2nd bit. If you toggled it 100 times (or more) and...- stephenjvb
- Post #2
- Forum: Programmable logic controllers (PLC)
-
help me to chose plc
This is too vague to be answered. Are you talking about a PLC connected to the internet for monitoring; protecting the program from being copied; or what? I personally like PLC direct. They have a broad line of PLCs and you can actually talk to a knowledgeable person in technical support (on...- stephenjvb
- Post #2
- Forum: Programmable logic controllers (PLC)
-
reverse biased mosfet
To VE1BLL: I would use option 1 but the customer used option 2 and messed it up with both sides of the mosfet connected to logic ground, effectively eliminating the mosfet. I don't understand the circuit, the person who designed it isn't available and they need a completed (and presumably...- stephenjvb
- Post #5
- Forum: Circuit design
-
reverse biased mosfet
To VE1BLL: I would use option 1 but the customer used option 2 and messed it up with both sides of the mosfet connected to logic ground, effectively eliminating the mosfet. I don't understand the circuit, the person who designed it isn't available and they need a completed (and presumably...- stephenjvb
- Post #4
- Forum: Circuit design
-
reverse biased mosfet
I am revising a circuit board and have a problem with part of the design. There are clear errors (beyond my question here) but I don't understand the circuit so I'm not sure how to fix it. The data sheet for the VNH3SP30-E, figure 33 (... short circuit protection) shows a N MOSFET with the...- stephenjvb
- Thread
- Replies: 7
- Forum: Circuit design
