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Thanks.

"However I overlooked the power dissipation across the resistor that i was using and i ended up giving 28V to PPTC fuse." I meant that power was exceeding the power rating of the resistor(1W) that I was using and this resistor was becoming short. "Since this would result in a current that is...

Thanks for the reply. Surely I have that resistor arrangement in my module. Now the hurdle that I'm facing is selecting an MUX. I have around 500 odd wires to be tested. I'm intending to test around 32/64 at a time. PLease suggest an reliable Mux IC having 64 channels.

Thank you all for your replies. I slighty modified the design to suite the requirement. The updated design block diagram is attahed here:[link]http://files.engineering.com/getfile.aspx?folder=d901f15a-e19a-49ee-b564-36d7fe251a5a&file=continuity_tester.png[/url]. I'm intending to have two...

I experimented with the resetable PTC fuse GP 16 300 to understand its working.It's details and datasheet is in this link [url=http://www.goodpoly.com/pdf/GP16%20series.pdf] As per the datasheet, this says the V[max]=16V, I[h]=3A and I[T]=5.1A. I want to verify these parameters and understand...

even shorts. To find shorts only I'm intending to do this continuity test.

one end of the wires are connected to the multiplexer ic and the other end is connected to the demultiplexer IC. I'm planning to sequentially test the wires by changing patterns with the help of a pattern generator.

Hi. I want to design a continuity tester that can test the continuity of wiring. I'm planning to use an analog multiplexer, a pattern generator IC, and a simple 5V voltage source and an Led arrangement for the test. Please suggest any better ways to do it. The block diagram is attached. Please...

Thanks for the suggestion. I'l surely look into this. My circuit is like a 24 V supply resistor and sensor all in series....So If there is a current surge the current will flow across the resistor(fusible resistor) which will break at the overload and will hence provide the protection.

How to choose the PTC fuses.

After a lot of googling found that the fusible resistor was the best fit for the protection design. If I use a fuse, then I would have to use around 60 fuses since I have so many branches. using a fusible resistor sounded a rifht option for me since it will not only break during overload but...

Hi guys. I'm thinking to use the fusible resistor in my circuit to provide protection by limiting the current. But not able to figure out when the resistor will burn out and provide protection. Also is it possible to put a LED across it to know if the resistor is working or not. The resistor is...