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The new datasheet summary is pasted below. I am also using the new MMBT2222 datasheet instead of the old 2N2222.

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Now I thnik @csabahu's use of the opAmp is a much better approach, because the opAmp should not load down output signals and also can easily adjust gain factors. But I have little experience in using opAmp for instrumentation. So I need to google some more tutorials before I start my new circuit. My old design with Ic of the order 1mA has already saturated the 2N2222. Now I am thinking of up shifting the Ic test range from 1mA to 10mA, and even up to 100mA. My old selection of Ib of the order of 1uA is also too small for my cheapy multimeter to measure. / to continue,... References (1) P2N2222A Amplifier Transistors NPN Silicon - On Semiconductor Update 2020oct06 The old reference list was getting too long and messy, so I have moved those not too relevant old references (16 in total) to the GiHub page. (17) Precision Temperature Measurement Using CMOS Substrate PNP Transistors - M Pertijs, G Meijer, J Huijsing etal, IEEE Sensor Journal 2004. (18) Diode-Based Temperature Measurement - TI, Application Report SBOA277A–March 2018–Revised May 2019 (19) What's All This Vbe Stuff, Anyhow?

So I won't bother for now to find a thermometer for higher temperature. Actually my calibration plan is to use the DS18B20 temperature sensor to replace my cheapy home use thermometer. Update 2020oct08hkt1413 Now 2N2222 is enjoying a cold plunge Update 2020oct08hkt1111 A more high school student friendly schematic of the 2N2222 temperature sensor. Update 2020oct07hkt1549 Sauna test results - stackOverflow! Hot water bath overflows my digital thermometer! Update - 2020oct07hkt1151 Tidying up messy wiring, getting ready for Hot Sauna Cold Plunge Update 2020oct06hkt2141 So I adjust the values of Rb and Rc to move operation region from saturation to amplification, where current gain is around 250, similar to the value measured by the multi-meter, as illustrated below. I then used a hot gun to blow hot air to the 2N2222 circuit. I guess the temperature around the circuit should be higher than 50 degree C, because my hand could not bear it for more that one or two seconds. I am glad to see that Vc, Ic, and Ib rose, as summarized below.

Where to buy PlayStation 5: Why another restock won't last

------------------------------------------------------- Temp Ib (mA) Ic (mA) Vc (V) β 28°C 0. 0230 5. 6 0. 18 243 Hot air 0. 0244 6. 6 1. 30 270 Of course the temperature as measured by hand is very crude, but the changes of Ic, Vc, and β is significant. I don't worry that Ic, Vc, and β vs temperature is non linear, because we can use software to calibrate, sort of flatten/straighten the non linear curve to a straight line. Next step is to use ice cold water around 0°C and hot water at 90°C to measure and plot Ic, Ib, Vc, and β against temperature in C°. Update 2020oct06hkt1534 Now I am updating my old design with an opAmp. Update 2020oct0601 As I found that my old tests do not give expected results, because of wrongly chosen components values. So I am moving the old design and bad test results to the GiHub page. I think @csabahu's answer is very good. So I am studying his design and using his testing parameters to do my coming tests. I originally thought that I should be using the 2N2222's current gain to amplify the very small output values for easy measurement.

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If you're engaged in a daily ritual of trying to find stores that have restocked their PlayStation 5 supply, you might've had a glimmer of hope this morning. Tom's Guide reports that select Target stores were showing some PlayStation 5 consoles in stock. A quick search reveals that a few Targets in the New York City metro area have stock, but I'm not seeing any stores in my local Cincinnati area where that's the case. Since you can't reserve a console online, even rushing out to a nearby store based on inventory listings could be a fruitless endeavor. The Midwest supermarket chain Meijer also posted a Playstation 5 "restock alert" on Twitter, but with no way to check inventory online. Meijer's Twitter account says you'll have to show up at the store and look for a sign to confirm that the console is in stock—and presumably buy some groceries while you're there if you come up empty. Meanwhile, Kotaku reports on a chaotic scene at a retailer in Tokyo, which tried to hold a major PlayStation 5 restock event last week.

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The sale was ultimately cancelled as police had to disperse the mob of prospective shoppers. Supplying enough consoles has been an ongoing problem for both Sony with its PlayStation 5 and Microsoft with its Xbox Series S and Series X since the new systems launched last fall. As Bloomberg reported in December, the coronavirus pandemic has led to shortages in the tech industry supply chain. That in turn has created a golden opportunity for scalpers, who've used shopping bots to automate the process of snatching up consoles sold online. Compounding the matter: There's a lot of actual human demand for the new systems, which represent the first major generational leap in home game consoles in seven years. At least in the early days, the bots have been prevailing. Sales data from Famitsu, as reported by Bloomberg in December, shows that the number of PlayStation 5 sales is about three times higher than sales of the top three games on the platform. A normal ratio would be around one to one; the fact that it's so skewed suggests that a lot of the new consoles aren't ending up in the hands of players.

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Bloomberg also reported that chip supply from key vendors will be limited through the first half of this year, a sentiment echoed by Microsoft last week. Speaking to the New York Times, head of investor relations Mike Spencer said to expect Xbox Series S and Series X supply shortages through at least June. And so the daily restock ritual shall continue for the foreseeable future.

- Bob Pease, Electronic Design's Analog Applications Supplement, 2000jun26 (20) How do you get a temperature sensor from a transistor? - Randy Frank, Sensor Tips, 2017oct27 (21) Using Diodes or Transistors as Temperature Sensors - electronicsNmore, 400K subscribers, 11, 037 views 2014nov01 (22) AliExpress LM134/LM234/LM334 3-Terminal Adjustable Current Sources - TI, US $2/5pcs (23) DS18B20 Programmable Resolution 1-Wire Digital Thermometer Datasheet (±0. 5°C {9-bit to 12-bit} accuracy, -10°C to +85°C) - Maxim (24) DS18B20 Temperature Sensor - Rpi 3/4 Driver, Wiring, Detection, and Python Programming - Rpi SE 2019jul02 Appendices Update 2020oct06hkt1434 My first idea of testing plan is wrong, because I don't understand the small signal properties of 2N2222. My knowledge and experience is only on the use of 2N2222 as a switch. So I am studying the datasheet and thinking of designing a new test plan. One thing I am doing is to shift the Ib and Ic testing range, so it is easier to use my multi-meters to do measurements.

Question How can I use a 2N2222 transistor as a temperature sensor? I'm supposed to use a TMP36 transistor for a class to read the temperature of the environment, but I only have a 2N2222 transistor; the Arduino will have an analog read of it, but the numbers won't change even if I heat it up. Am I screwed or can I fix this? I am in high school studying for math. Answer Update 2020oct08hkt2248 So I did the preliminary test and measured the three values, Ib (Note 1), Ic, and Vc against temperature from about 3°C to above 50°C (Note 2). I also use Excel to calculate β. A summary is given below. Note 1 - The Ib column is almost constant, as is Vbe. So Vcc and Rb is an approximation of applying a current source to an diode (2N2222 BE junction), and measure Vbc, as advised by @Tony Stewart Sunnyskyguy EE75. Note 2 - My cheapie digital thermometer for home use overflows somewhere above 50°C. The OP's requirement anyway is to measure the "environment" which I think is approx a range from 0°C to 50°C.

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