You are welcome! Thanks for your interest in my videos. Please see more sensor circuit videos in th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html which is sensor video playlist.
You're welcome! Glad that this channel is useful. Sure, regarding BJT Amplifier please see: Class A BJT Amplifier Design with Transformer th-cam.com/video/gKlJrqGqeCI/w-d-xo.html Differential Amplifier Design with BJT & JFET transistors th-cam.com/video/zKgSYvk7JAM/w-d-xo.html Feedback Amplifier: How to find DC Bias and AC Gain th-cam.com/video/6dLMxpLNKv4/w-d-xo.html How to find Gain of Feedback Amplifier Example with JFET & BJT Transistors th-cam.com/video/NB1-mYglXsY/w-d-xo.html I hope these videos are helpful. 🙋♂️
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 th-cam.com/video/55YsraFE0rg/w-d-xo.html
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.
Thermometer Sensor Circuit Operation is explained in this video. For more sensor amplifiers see th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html and the following videos EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html Thermometer Circuit Design with Op Amp and BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html PhotoDiode Amplifier with Data Compression Explained th-cam.com/video/hqrRx2ufAwg/w-d-xo.html Thermometer Current source th-cam.com/video/Ggf0yCaTTiY/w-d-xo.html Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained th-cam.com/video/io1yBcCsP-Y/w-d-xo.html Temperature-Compensated Programmable Current Source Circuit Design with Zener Diode, BJT Transistors th-cam.com/video/QY48IQXJIRI/w-d-xo.html Temperature-Independent Current Circuit Design with Op Amp, BJT, Zener, Schottky Diodes th-cam.com/video/hFbnjbddUvs/w-d-xo.html Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html For more analog circuits and signal processing examples see: th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html I hope these sensors and thermometer circuits videos are interesting. 🙂
-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 th-cam.com/video/55YsraFE0rg/w-d-xo.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.
Excellent content!
Thank you! Glad that this video is useful. For more sensor circuits & amplifiers please see th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html a
Hi,
Was waiting for this ..... Cheers !!!
You are welcome! Thanks for your interest in my videos. Please see more sensor circuit videos in th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html which is sensor video playlist.
Very interesting. Thanks for valuable content. I like the "trick" with those 2 zeners :)
You are welcome 🙏 Glad that you like this video and the technique of series of two Zener Diodes that counteract their temperature dependencies. 🙋♂️
Hi, I love your videos, can you please make a very thorough video on BJT CE amplifier. Thanks 🙏
You're welcome! Glad that this channel is useful. Sure, regarding BJT Amplifier please see:
Class A BJT Amplifier Design with Transformer th-cam.com/video/gKlJrqGqeCI/w-d-xo.html
Differential Amplifier Design with BJT & JFET transistors th-cam.com/video/zKgSYvk7JAM/w-d-xo.html
Feedback Amplifier: How to find DC Bias and AC Gain th-cam.com/video/6dLMxpLNKv4/w-d-xo.html
How to find Gain of Feedback Amplifier Example with JFET & BJT Transistors th-cam.com/video/NB1-mYglXsY/w-d-xo.html
I hope these videos are helpful. 🙋♂️
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 th-cam.com/video/55YsraFE0rg/w-d-xo.html
Can two zeners be replaced with a single TL431 ?
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.
Thermometer Sensor Circuit Operation is explained in this video. For more sensor amplifiers see th-cam.com/play/PLrwXF7N522y7Ut9bm8TXAOhIWqL__FGlj.html and the following videos
EKG ECG Amplifier with Right Leg Drive Explained th-cam.com/video/1c7KGXPs4do/w-d-xo.html
Thermometer Circuit Design with Op Amp and BJT transistor th-cam.com/video/55YsraFE0rg/w-d-xo.html
PhotoDiode Amplifier with Data Compression Explained th-cam.com/video/hqrRx2ufAwg/w-d-xo.html
Thermometer Current source th-cam.com/video/Ggf0yCaTTiY/w-d-xo.html
Strain Gauge Wheatstone Bridge Instrumentation Amplifier Explained th-cam.com/video/io1yBcCsP-Y/w-d-xo.html
Temperature-Compensated Programmable Current Source Circuit Design with Zener Diode, BJT Transistors th-cam.com/video/QY48IQXJIRI/w-d-xo.html
Temperature-Independent Current Circuit Design with Op Amp, BJT, Zener, Schottky Diodes th-cam.com/video/hFbnjbddUvs/w-d-xo.html
Instrumentation Amplifier with Electronic Gain Control th-cam.com/video/C4tghZ-q6Zs/w-d-xo.html
For more analog circuits and signal processing examples see: th-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html
I hope these sensors and thermometer circuits videos are interesting. 🙂
-15V required :(
-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 th-cam.com/video/55YsraFE0rg/w-d-xo.html
Could snap ground for +15V and snap-15V for ground to get the same potential difference, non?
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.