Skip to main content
4 votes
Accepted

Can anyone identify this manufacturer? "E3"?

Dunno about the logo, but it's a Hartmann part number. There's been a lot of consolidation in the electronics industry- maybe they bought someone up before being swallowed up themselves by Phoenix ...
Spehro Pefhany's user avatar
4 votes

Can anyone identify this manufacturer? "E3"?

Not a proper answer, but I was interested to see if a logo search would show up anything so I created one in Inkscape and dropped it and its negative into Google's Image Search. No joy. They may be of ...
Transistor's user avatar
  • 177k
4 votes
Accepted

What is this SOIC-8 part from ST?

How about the ST LM393? https://www.st.com/en/amplifiers-and-comparators/lm393.html There are ordering codes that are in a SOIC package and just marked "393". The second row could be ...
W5VO's user avatar
  • 19.1k
3 votes

What makes transconductance negative?

More properly, the transconductance gain is -1 A/V. A transconductance amplifier has a high-impedance input, and it responds to a voltage on that input, while using minimal* current. It has a high-...
TimWescott's user avatar
  • 46.6k
3 votes

What makes transconductance negative?

Quoting from the same answer, next sentence: "It's minus only to avoid messy looking wire crossings in the image."
Elliot Alderson's user avatar
2 votes

IO link sensors with PLC

When using IO link technology with a PLC (siemens s7-1200) can you connect devices that are not IO link sensors? For example say I wanted to connect an existing normal push button to a IO link master ...
lcecl's user avatar
  • 168
2 votes

ASi (AS-Interface), understanding power supply

The resistors perform a weak pull from each side to ground. I don't know why they've labeled it as "shield" as AS-i cable doesn't have a shield. In the systems I'm familiar with the centre ...
Transistor's user avatar
  • 177k
2 votes
Accepted

Thyristor T901N

70°C Tc is the case temperature so you have to consider the heat sinks, air flow and ambient temperature as well as thermal resistance from case to heatsink. The power dissipation of a thyristor in a ...
Spehro Pefhany's user avatar
1 vote
Accepted

I Need help to find what smd component is this?

Possibly a common BC817-40 or similar https://assets.nexperia.com/documents/data-sheet/BC817_SER.pdf
Spehro Pefhany's user avatar
1 vote

What makes transconductance negative?

Transconductance is not, in general, negative. The transconductance of the specific amplifier in the question you link is negative, but in general transconductance can be either positive or negative. ...
Hearth's user avatar
  • 35.3k
1 vote

Contacts on Safety Relay

Contact numbering follows the format XY Y = 1/2 (normally closed) or 3/4 (normally open). X = contact number 1, 2, 3, etc. simulate this circuit – ...
Transistor's user avatar
  • 177k
1 vote

ASi (AS-Interface), understanding power supply

The resistors and capacitors have identical values, so they keep the shield at half voltage between ASi+ and ASi- voltages. The resistors keep the DC level bias of the shield at DC at low frequencies. ...
Justme's user avatar
  • 159k
1 vote
Accepted

Is it possible to change counter signal to analog signal in Siemens Logo?

I've done this using the Mathematical instruction. ...
Transistor's user avatar
  • 177k
1 vote

IO link sensors with PLC

say I wanted to connect an existing normal push button to a IO link master, is it possible to cut the plug of the IO link cable and connect the button with the 3 required cores No. You would need to ...
Graham Nye's user avatar
  • 4,423
1 vote

IO link sensors with PLC

An IO-Link system consists of an IO-Link master and one or more IO-Link devices That's a quote from Wikipedia IO-Link and basically it means that master and slaves have to be compatible: - An IO-...
Andy aka's user avatar
  • 465k
1 vote

TIA portal - failed to establish a connection

Nothing special, TIA is a master of troubles and issues. First, make a correct settings for your PC ethernet NIC, make the IPv4 to be in the same subnet, for example 192.168.0.150. Then plug the cable ...
Marko Buršič's user avatar
1 vote
Accepted

PLC s7-1200 Ladder logic

Figure 1. Timer operation pages shows that ET, elapsed time, stops when the PT, preset, time is reached. From that we can deduce that we will never get ET > PT. On the basis of the above information ...
Transistor's user avatar
  • 177k
1 vote
Accepted

Understanding ladder PLC logic

If you have a latter version of TIA that allows mixing LAD and SCL you can add a simple code, instead of LAD: ...
Marko Buršič's user avatar
1 vote

Understanding ladder PLC logic

is it sequential like c/c++? No, with typical column scan pattern* it is evaluated top-to-bottom and left-to-right. This means, first all of column 1 is evaluated from row 1 to end, then column 2 is ...
Jeroen3's user avatar
  • 23.2k
1 vote
Accepted

Finding current over controllable voltage source using nodal analysis

These two are obvious by inspection: $$\begin{align*} V_3&= 13 \:\text{V}\\\\ V_0&= V_2 \end{align*}$$ These are from simply writing out the nodal equations: $$\begin{align*} V_1\cdot 1\:\...
jonk's user avatar
  • 78.3k
1 vote

Switching outputs using ladder logic

Your screen grabs are too difficult to read. It sounds as though you are looking for a 60 s clock with 50% duty cycle. The normal method is to generate a timing sequence as follows: ...
Transistor's user avatar
  • 177k

Only top scored, non community-wiki answers of a minimum length are eligible