HELP me. Anyone??

[Callmesenpai]

I always get an netlist errors. I need it by the day after tomorrow. Can somebody help me?

• i can't upload the file. just the image. I Got error on the blue part. help me please.
• 
  

 

[audioguru]

The two transistors make a do-it-yourself Silicon Controlled Rectifier. The sim program should already know the specs for the common BC557 transistor.

 

[DerStrom8]

What is the exact error you're seeing?

 

[Callmesenpai]

The two transistors make a do-it-yourself Silicon Controlled Rectifier. The sim program should already know the specs for the common BC557 transistor.

Yeah. It is a DIY SCR. On the video, the SCR # didn't mention.

 

[Callmesenpai]

What is the exact error you're seeing?

THIS

 

[Callmesenpai]

The two transistors make a do-it-yourself Silicon Controlled Rectifier. The sim program should already know the specs for the common BC557 transistor.

can you suggest an SCR MODEL #? FOR THIS CIRCUIT? (PHOTO ATTACHED)

 

[jpanhalt]

The current through the SCR is limited by the output of the 555, so it is <0.5 A (555's source or sink a max of 200 mA). Almost any small, general purpose SCR with a current rating of ≥0.5A should work. What do you have available? If you list them, we have help you select.

John

 

[DerStrom8]

THIS

It tells you exactly how to fix the problem!

 

[KMoffett]

You need to:
1: Ctrl-x and Ctrl-v that transistor
2.: "Ungroup component" the new transistor
3: Edit each of the pins to add numbers
4: Pull a selection box around the transistor's parts
5 "Group component"

Ken

 

[audioguru]

About 40 years ago I used many 2N5061 SCRs and today I remembered the part number. Digikey has almost 6000 in stock today and the minimum order is only one for $.62US.
Why do you want a real SCR when you are simply simulating the circuit, not building the circuit? The Sim program might not know anything about a real SCR.

 

[KMoffett]

AG,
The OP's schematic is in ExpressPCB, not in a simulator.
Ken

 

[audioguru]

Oh, it is for a pcb design. The datasheet of the SCR shows which pin is which.

 

[KMoffett]

AG,

ExpressPCB allows you to designate any pin with any number for any schematic symbol. Some symbols come with the pins numbered, and some do not. It allows you to match pin numbers in schematic symbols with the matching parts in the PCB development package. You can also add or change the pin designations on the PCB parts. The libraries of schematics symbols and PCB parts are not always specific. Examples would be TO-93 packages for NPN/PNP/FET/SCR/Regulators that do not have the same pin alignment. You can make one-for-one symbol/part custom libraries. Bug or feature?

Ken

 

[ShawnR]

I use Express PCB. I think KMoffat has the right idea. I have seen that sometimes the connections are not completed. Try highlighting the part and dragging it a bit. If all of the traces do not follow then the program did not connect them and thinks the part is just hanging there

 

[KMoffett]

I've seen that too. But even if the traces do stick to the pin, the pin can still lack a number. Then you will get a netlist error when you do a check netlist.

Ken

 

[Callmesenpai]

i still get the same error.

 

[DerStrom8]

i still get the same error.

What did you do to try to fix it?

 

[Callmesenpai]

What did you do to try to fix it?

well, i tried this one.

You need to:
1: Ctrl-x and Ctrl-v that transistor
2.: "Ungroup component" the new transistor
3: Edit each of the pins to add numbers
4: Pull a selection box around the transistor's parts
5 "Group component"

Ken

 

[ShawnR]

Can you upload the file and someone with express PCB can open it and see what is going on? Not sure if we can upload such files.....

Oops, I see you tried. I will try to send you a pm

Did you try moving the part to see if all connections are complete?

 

[Callmesenpai]

Can you upload the file and someone with express PCB can open it and see what is going on? Not sure if we can upload such files.....

Did you try moving the part to see if all connections are complete?

https://www.filedropper.com/zxcschem (i uload my file here)