hi gammy,
This is a sim of the circuit from Post #38 @bertus
I have used different transistors, the 2N1613 is getting old.
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Thank you guys. I appreciated your efforts. Can I have another favor? I have this project of 12 minutes coundown timer I dont know how to start it.

 

hi ganny,
I would recommend that you Create a new Thread for that new topic.
Look forward to seeing it.
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Okaay. I will create a new one. By the way could you send me the multism file of this? Thank You

 

By the way could you send me the multism file of this? Thank You

hi g,
Sorry I do not use multisim, I use LTSpice for simulation.
It is a free download from the web.
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I already download LTSpice. Could you send me the file I need to check if the transistor I bought is good to substitue

 

hi,
Here it is '4Wattamp.asc'
If you have a query, post your asc files so that we can compare.
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Okay thanks. I will