Actually, 4.3(0.055%)-3.9(0.06%)=0.0025% so V = 8.2V(1+0.0003% (T-25C)). Also, by varying the Zener current we could even trim this out to have zero temperature coefficient.
Well said! Thank you for the follow-up accurate calculation of the overall temperature coefficient for the series of two Zener Diodes described in the video. The Zener current adjustment is best done via using a Potentiometer instead of the fixed 1k Ohm resistor. For an alternative Temperature sensor design technique pls see Thermometer Circuit Design with Op Amp and BJT transistor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-55YsraFE0rg.html
Thermometer Sensor Circuit Operation is explained in this video. For more sensor amplifiers see ru-vid.com/group/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj and the following videos EKG ECG Amplifier with Right Leg Drive Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1c7KGXPs4do.html Thermometer Circuit Design with Op Amp and BJT transistor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-55YsraFE0rg.html PhotoDiode Amplifier with Data Compression Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hqrRx2ufAwg.html Thermometer Current source ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ggf0yCaTTiY.html Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-io1yBcCsP-Y.html Temperature-Compensated Programmable Current Source Circuit Design with Zener Diode, BJT Transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-QY48IQXJIRI.html Temperature-Independent Current Circuit Design with Op Amp, BJT, Zener, Schottky Diodes ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hFbnjbddUvs.html Instrumentation Amplifier with Electronic Gain Control ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-C4tghZ-q6Zs.html For more analog circuits and signal processing examples see: ru-vid.com/group/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these sensors and thermometer circuits videos are interesting. 🙂
You're welcome! Glad that this channel is useful. Sure, regarding BJT Amplifier please see: Class A BJT Amplifier Design with Transformer ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gKlJrqGqeCI.html Differential Amplifier Design with BJT & JFET transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-zKgSYvk7JAM.html Feedback Amplifier: How to find DC Bias and AC Gain ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6dLMxpLNKv4.html How to find Gain of Feedback Amplifier Example with JFET & BJT Transistors ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NB1-mYglXsY.html I hope these videos are helpful. 🙋♂️
That's a good question. Yes, you can as long as the precision reference voltage is set so that it's temperature variation is negligible compared with -2.1mv per degree voltage change of PN junction. Otherwise, more precise Shunt Voltage Regulator is recommended.
You are welcome! Thanks for your interest in my videos. Please see more sensor circuit videos in ru-vid.com/group/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj which is sensor video playlist.
-15v is not required. You can change it to -10V and reduce 1k Ohm to say 470 Ohm. Or alternatively we can design the same circuit using +15V instead of -15V. Here is also an alternative implementation: Thermometer Circuit Design with Op Amp & BJT transistor ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-55YsraFE0rg.html
From Voltage difference perspective, yes but we won't then get zero volt at output when PN junction temperature is zero degrees Celsius. We will need a level shifter or further circuit modification.
