[Coco] OT: electronics question

[Bob]

--- James Dessart <james at skwirl.ca> wrote:

> I've got a 7402 I pulled from a board. I hooked it up to a 5v source 

> and ground. When I sample the inputs, I get a lowish voltage (around 2 

> volts, unconnected pins), but when I sample the output, regardless of 

> how I drive the inputs, I get a really, really low voltage. Do I need 

> to do something in particular to drive the inputs? I'm simply using a 

> switch to vcc right now. Should I set it up with the switches 

> triggering transistors?

> 

> It could be burned out, I used a butane torch to take it off the board. 

> It's pretty thick PCB, and I can't seem to get the chips off any other 

> way.

> 

> James

 
If either input is high, the output should be low. Short both inputs to ground
and the output should go high. I assume you have the pinout for this quad NOR
gate.

The easiest method is to simply cut the leads with some small dykes, desolder
the remaining pins and solder in a socket.

Bob


	
		
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