Two transistor cct test

How does this two transistor circuit work?

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Can anyone explain how this circuit works?

If Q1 turns on then does Q2 turn off or on?

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bjtshareedit  follow  flagedited 30 mins agoJRE40k88 gold badges7070 silver badges114114 bronze badgesasked 49 mins agoNakh0d43922 bronze badges

  • 1What do you think it’s supposed to do? Is this you’re own design? – Transistor 46 mins ago
  • 1thank you for answered me by a question! it is not my design, I just try to simulate it. in mu opinion when Q1 is on, Q2 should be on also. but someone told me Q2 should be off – Nakh0d4 39 mins ago
  • 1that person is incorrect. maybe they thought Q2 was npn, when it is in fact pnp. – BeB00 23 mins ago
  • 1@Nakh0d4, I would like to see it as a question to test (1) if a learning with basic understanding of NPN/PNP BJT can do it within how long. (2) if a guy coming to a job interview can do it or not, and for how long. Suggestion: my first feeling is that I can do it within 15 minutes, and write up an answer in another 15 minutes. I would suggest a “challenge” with the following rules: use your smart phone stop watch to time your answer, but do NOT disclose your answer yet. Perhaps we can set a deadline of three days, or .. Comments and counter suggestions welcome. – tlfong01 23 mins ago   
  • 1@tlfong01 I dont understand what you are talking about. are you suggesting a circuit like this would be suitable for a job interview as an electronic engineer? I feel like any competent professional engineer (i.e. someone who does it for a job) should be able to do this in about 8 seconds. – BeB00 18 mins ago 
  • The circuit doesn’t do anything useful; it just consumes current and appears not to interface to anything other than the air that surrounds it hence it really doesn’t do anything. So, when @transistor asked you what it’s supposed to do he asked a very pertinent question because, without some insider knowledge about why it was designed, all that can be said is that it consumes some current and gets a little warm. So, what’s the point of simulating it – none. Do you understand what you are doing or why you are doing a simulation because, without some proposed functionality, the circuit’s useless – Andy aka 13 mins ago
  • @BeB00, Let me introduce myself. I completed an EE diploma ages ago. Then I went to job interviews for electronics technician jobs, mainly repairing rejected transistor radios (usually Philips, yes, those were the days). The candidates would be given 5 or 6 broken radios and try to troubleshoot, and report something like: (1) sample 1 has battery wire broken, poor contact etc. I still remember in some of the interviews, my hands were trembling when doing the testing, … – tlfong01 11 mins ago   
  • My suggested “challenge” is for newbies, ninjas, and pros. It is sort of self assessment test for myself to make sure if I have lost some of my transistor knowledge and so called critical thinking in troubleshooting jobs. By the way, I only learn BJT and very little MOSFET in college. Now I am learning MOSFET. Perhaps later I can make up some MOSFET questions to test myself and other newbies, … – tlfong01 4 mins ago    Edit   
  • @tlfong01, please don’t forget that comments are for seeking clarification on questions or answers. They are not for a personal blog or irrelevant chit-chat. – Transistor 3 mins ago
  • Thank you for your advice, perhaps I can create a chat room in this or other forums to make this off topic comments. Thanks again. – tlfong01 1 min ago   Edit   

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