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...
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...
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...
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...
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...
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
Hi Folks,
In the attached application note figure 12 - Page 7, is there a need to select a safety approved (UL) resistor Rx/2 for any type of safety certification purposes? The IC HCPL-3700 is already providing safety rated optical isolation between 110/220V mains input and 5V logic output. Any...
Hi Guys,
The attached circuit is an AC redundant input circuit for a chassis that runs several SBC cards. The AC powers four PSUs. For some reason when the AC is turned ON, occasionally the fuses on both AC inputs (one fuse each on each side) burns. Switching the AC inputs individually the...
Hi Guys,
Anybody has familiarity with 1000Base-BX to 1000Base-T conversion using Broadcom or any other vendor Ethernet PHY?
I am using a BCM5464S without MDIO/MDC connection as a media converter. Will this work with just hardware bootstrapping only or I will definitely have to have a small 8...
The project that I am work on has about 600 different signals coming out of a backplane to the fornt panel and I do not have too much room on the panel to put the regular Ethernet connectors. The operating environment demands circular connector (I know RJ45 are available in circular shell but I...
