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Testing 14 pin nangate Ic

Pommie

Well-Known Member
Most Helpful Member
That has schmitt trigger inputs so can't be tested just digitally. A simple go/no go approach would be to test each gate using something like,
Nand.jpg
You would also need to connect the supply pins.

Mike.
 

Gregory

Member
Will this test circuit tell me if the gates are faulty or only one gate .As I will have to test each one
 

gophert

Well-Known Member
Most Helpful Member
The number on the Ic is CD 4093 BCN
k resistor from each input to ground. Apply power to 9 to 15vdc as Vcc

Then use a probe at Vcc level and touch one and both inputs on each gate while checking output level.

58F8C88F-59BE-40B8-9D2A-E3927A88EA55.jpeg
 

Gregory

Member
Is 1&2 , 5& 6 , 9&8 , 13&12 connected to negative I have red post and you have mentioned what I want to know
 
Last edited:

Pommie

Well-Known Member
Most Helpful Member
You'll have to test each gate separately and all unused inputs (6 of them - not 8) should be connected to positive or ground. Might be easier to setup the circuit at one end and use flying leads to each gate to test.

Mike.
 

gophert

Well-Known Member
Most Helpful Member
Is 1&2 , 5& 6 , 9&8 , 13&12 connected to negative I have red post and you have mentioned what I want to know
In my circuit, all of those input pins are connected to a 10k resistor, and the other end of the 10k resistors connected to ground. Then you can use a pair of jumper wires (one end of each jumper connected to Vcc) to test each gate (one at a time) with all four truth table options.
 

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