Hi,
While doing some work around the building to repair dry rot we came across this beam that was sandwiched between 1 1/8 ply board and bolted together to the beam. After we took the ply out we noticed the cantilver part of beam was held by only the plyboard and bolts. My contractor put these...
Thanks VEIBLL and IRstuff.
You guys are certainly correct on the point that this a grounding issue. But let me first answer the questions.
How long is the cable (shown on the right side)?
(K) The cable is 6 feet long.
Are there other power or signal wires contained in the same cable?
(K)...
Hi,
We are working with a USB2.0 design that has attached circuit block diagram. The USB2.0 is working intermittently. USB 1.0 works fine. We have ruled out a few things now. We are doing eye pattern under various scenarios and trying to see what is causing the issue. We are reading eye pattern...
Thanks iop95 for your comments. See response below.
What is bandwidth of scope used to see U3 output?
(We are using the 2GHz scope. The signal frequency is 742MHz. It is not ideal but it is good enough to show input side eye diagram on U3. Those are very clean eye patterns.)
Why used 16V cap...
Hi ,
Attached is an HDMI (1.485gbps) redriver/retimer circuit. It takes in DP++(DDI) input and produces HDMI signals going to connector. We are trying to troubleshoot this circuit. We are seeing some lines on the monitor. When scoped the output HDMI signal is about 3Vpp. This voltage should not...
Transient protection is Vicor's recommendation. The bridge is what they are recommending for reverse polarity protection. But the voltage loss/power loss in the bridge is not desirable. The MOSFET needed for this job needs to handle only 100V and this fit the budget from all the specs needed...
Guys,
Can you comment on the downside of the attached circuit comparing to other methods of reverse polarity protection? I do not want to use bridge or diode for power dissipation reasons ( parallel reverse bias diode will blow the fuse so that is also not an option). This circuit will see...
Very good points. Unfortunately this system has an embedded OS. The system power source should have battery back up in case power is out to implement this feature.
Thanks.
This could be an option. The Zeroization pin on a system board connector when detected by the software as grounded, all the software stored in the flash memory of the system is wiped off.
Thx for the input.
Hi Guys,
What will be the best way to provide Zeroization option for a system without using an external (Covered) switch? Zeroization pin when grounded clears all the software on the system. Some systems have implementation that takes external 12V pulse with isolated GND to trigger the internal...
"reduce R6325 and R6326 by minim a order. "
This was it. Changing the divider current to 1mA did the trick. Original value was 1.5uA then changed to 5uA with not difference. So new values of U6325=3.3K and U6326=1K provides current of 1.2mA and it worked.
Thanks a lot iop995 and all who took...
Hi Guys,
Here is a circuit that is two part. Top part is 48V ( Telecom -48V) monitoring circuit. This circuit converts 48V to a low isolated voltage (~1.6V) 48V_MNTR. Also the 12V that power U26 is from same 48V going through a DC to DC (48V,4.5A to 12V) converter. Bottom part is a 15V...
Hi Folks,
I am reposing this thread from Circuit Design . Can anybody with UL expertise comment on this?
http://www.eng-tips.com/viewthread.cfm?qid=341737
Thanks
The attached example circuit from UL safety rated fuse resistor app note shows UL rated fuse and a regular resistor ( I believe) and replaced with one UL rated fuse/resistor as shown. Is this assumption correct that a regular resistor with UL fuse will be...
