LTspice different values

K

kingofjong

Member

• Jun 19, 2018

• #1

Hi

In the picture bellow I am probing the highlighted wire in simple_switch schematic (from yahoo group). The current and voltage through that wire is 0. I am also probing the highlighted wire in my custom circuit memory. But for some reason memory's voltage is 5. Not sure why that is happening. Both switches are set to 0 witch means off (or open). Hence the memory wire shouldn't be getting any voltage or current. I would appreciate any help.

picture


Thanks

 

crutschow

Well-Known Member

Most Helpful Member

• Jun 19, 2018

• #2

The image is too large, and the parts too spread out to readily follow the circuit.
Move the parts together, with less empty space and post a smaller picture.
Also post the .asc file.

 

alec_t

Well-Known Member

Most Helpful Member

• Jun 19, 2018

• #3

Do you have a ".param set=1" directive anywhere on the schematic?

 

K

kingofjong

Member

• Jun 19, 2018

• #4

Hi

How do I check ".param set=1"?

Thanks

 

Last edited: Jun 19, 2018

K

kingofjong

Member

• Jun 19, 2018

• #5

Hi

The image bellow is the whole memory circuit. I have highlighted the wire that has voltage when the switch is off.



Thanks

 

Attachments

• upload_2018-6-19_13-1-47.png

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alec_t

Well-Known Member

Most Helpful Member

• Jun 19, 2018

• #6

kingofjong said:

when the switch is off.

Click to expand...

Which switch?
We await your .asc file.

 

K

kingofjong

Member

• Jun 19, 2018

• #7

Hi

Attached the .asc file to this post. Switch u1 and u2 are causing the error.

Thank you

 

Attachments

• ascfile.zip

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crutschow

Well-Known Member

Most Helpful Member

• Jun 19, 2018

• #8

kingofjong said:

The image bellow is the whole memory circuit.

Click to expand...

How can that be the whole circuit, there's no connections to the transistor collectors?

 

alec_t

Well-Known Member

Most Helpful Member

• Jun 19, 2018

• #9

Leakage current through the base-emitter junctions is causing the effects you're seeing. Add pull-down resistors to the base connections.

 

K

kingofjong

Member

• Jun 22, 2018

• #10

Hi

I solved the issue, don't need anymore help.

Thanks