Thank you for your efforts making this video. If I'm not mistaken, and as I understand the explanations later in the video, at 0:33 seconds, the Cathode of the zener should be connected to the positive voltage potential. I believe this makes use of the specific reververse brakedown characteristic of zeners.
Very good video I need to explain a Zeaner diode to somebody and I may use this video the number one thing they need to know how to do was make a clipping circuit . Thanks.
Voltage regulators and zeners are not the same thing. With a voltage regulator you might pass 1 amp through it, you don't do that with a zener. You don't draw your load current through the zener. You pass enough current through the zener (typically milliamps) to cause the diode to break down at the required breakdown voltage. The datasheet will tell you what the minimum amount of current is. The zener is a voltage reference *NOT* a voltage regulator.
OK, say you have a 10V supply, 5 ohm series resistors and a 5V Zener. That can supply 5V 1Amp to the load. If you take an amp, the resistor gets as hot as a voltage regulator but all the current is going into the load so the Zener isn't hot. BUT, if you remove the load, that amp now flows through the Zener. The resistor is still hot, and now so is the Zener! Far worse than a voltage regulator. Which is why you would design the Zener circuit to only supply say 10mA, and then use that to drive a transistor to boost the current (I'm simplifying). And that's a linear voltage regulator.
Voltage regulators are a better option in high power circuits. Zeners have poor regulation and the output current range is limited. Voltage regulators often need heatsinks.
Zeners can't replace even simplest voltage regulators. Their breakdown voltage is unpredictable, they are drifting with temperature, their current is typically low.
I was messing with zener diodes yesterday and they don't work the way presented in books nor here...if you change input voltage, the zener diode voltage changes also, but not so much. for example, you change input from 5 to 20 volts. the zener diode voltage changes from 3 to 4 volts.
Is it? Better than a signal detection diode? Does the fact it is a zener which is designed to breakdown at a specified reverse bias voltage, is that a desirable or essential property to have in signal detection/demodulation?
Can a Zener diode be used to limit the output of a 650 watt portable gas generator to say 230 volts? Its governor keeping the revs constant to produce 230 volts is inoperative.
Actually, the Zener effect is a low voltage thing found in diodes with high doping levels; generally below 10V. Above that voltage the avalanche effect takes over. Anyway, no. You need a series regulator to regulate that way, and doing that with a high power device is spectacularly expensive. The governor should be economical enough to repair.
You may also use an LED as a Zener diode ! a red LED will regulate at about 2 Volts and a blue or white LED will be slightly higher at 3 Volts ... The EHT diode in a microwave oven has many high voltage diodes in its package and might regulate at around 10 Volts ( which is why you cannot test it with a multimeter set to diode test ! ) for MUCH higher voltages a Neon bulb can be used ( 90 Volts ? ) ..... DAVE™🛑
Agreed. I would not consider the parallel configuration a 1W Zener. It's a 0.5W Zener that keeps working if one Zener fails. Which is how they are used in safety applications.
Don't use zeners in parallel. I have never seen a circuit that does this. The devices would need to be perfectly matched. Use a bigger zener, they are cheap enough.
How is wattage calculated? Granted it has been a long time since I did any of this stuff. But nothing is ideal and K-laws are here to stay. So some current has to flow and non ideal R of those diodes has to work somehowe with rest of circuit.
he doesn't say that if he puts a larger voltage U across the resistor and the voltage on the zener diode rises, the zener diode short-circuits _maybe 10V on ZD 5V _ZD lets go and it is K.O. _But Voltage regulator is good and working
So it's a cheaper version or economical way to use than a voltage regulator? That's what I learned from your video. And the voltage regulator that you showed is a mosfet which can also control the output of the desired current. Isn't that a pros and cons to it?🤔
No. The voltage regulation is not as good as a regulator chip. There is no thermal regulation and the voltage changes with load and input voltage. The current draw must be known to calculate the series restor because the zener has an operating range. A decent regulator has a vastly improved range over a zener.
Thank you! Very clearly explained, with excellent examples of usage.
Glad if it was useful. Thank you 😊
Thank you for your efforts making this video. If I'm not mistaken, and as I understand the explanations later in the video, at 0:33 seconds, the Cathode of the zener should be connected to the positive voltage potential. I believe this makes use of the specific reververse brakedown characteristic of zeners.
Didn't understand it all, but at least I learned something. :)
🙃👍
Very good video I need to explain a Zeaner diode to somebody and I may use this video the number one thing they need to know how to do was make a clipping circuit . Thanks.
Thank you so much ☺️🙏
The world's best teacher thanks
You're welcome! I'm glad you think so 😊🙏
, . Big difference! Thanks
Very helpful thank you
Thank you so much ☺️
Thank you sir very helpful
I'm glad the videos were helpful. Thank you 😊
Very interesting.
😅👍
This was great, thanks! Quick question, voltage regulators are often quite inefficient, and can get quite hot, do Zener Diodes suffer the same issues?
Thank you. This type of problem is less common in the Zener diode.
Voltage regulators and zeners are not the same thing.
With a voltage regulator you might pass 1 amp through it, you don't do that with a zener.
You don't draw your load current through the zener.
You pass enough current through the zener (typically milliamps) to cause the diode to break down at the required breakdown voltage. The datasheet will tell you what the minimum amount of current is.
The zener is a voltage reference *NOT* a voltage regulator.
OK, say you have a 10V supply, 5 ohm series resistors and a 5V Zener. That can supply 5V 1Amp to the load. If you take an amp, the resistor gets as hot as a voltage regulator but all the current is going into the load so the Zener isn't hot.
BUT, if you remove the load, that amp now flows through the Zener. The resistor is still hot, and now so is the Zener! Far worse than a voltage regulator.
Which is why you would design the Zener circuit to only supply say 10mA, and then use that to drive a transistor to boost the current (I'm simplifying). And that's a linear voltage regulator.
Voltage regulators are a better option in high power circuits. Zeners have poor regulation and the output current range is limited. Voltage regulators often need heatsinks.
Nice video, thanks :)
Thank you so much ☺️
Thanks 👍
very useful
Thank you so much ☺️
Loved it. Thanks.
Thank you so much ☺️🙏🏼
Thanks!👍😄
Zeners can't replace even simplest voltage regulators. Their breakdown voltage is unpredictable, they are drifting with temperature, their current is typically low.
I was messing with zener diodes yesterday and they don't work the way presented in books nor here...if you change input voltage, the zener diode voltage changes also, but not so much. for example, you change input from 5 to 20 volts. the zener diode voltage changes from 3 to 4 volts.
Zener diodes are not perfect, as presented here. They have a slope and the voltage does change with input and load.
Can we put the resistor in the catode of zener ?
In series-connected circuits, their location does not matter. It can be that way.
@@eeapplications thanks for sharing, great video sir, salam 🙏🙏🙏
Thanks for CC translate in Germany
Its Super Good For radio Signal Detection
👍
Is it? Better than a signal detection diode?
Does the fact it is a zener which is designed to breakdown at a specified reverse bias voltage, is that a desirable or essential property to have in signal detection/demodulation?
Can a Zener diode be used to limit the output of a 650 watt portable gas generator to say 230 volts? Its governor keeping the revs constant to produce 230 volts is inoperative.
Actually, the Zener effect is a low voltage thing found in diodes with high doping levels; generally below 10V. Above that voltage the avalanche effect takes over.
Anyway, no. You need a series regulator to regulate that way, and doing that with a high power device is spectacularly expensive.
The governor should be economical enough to repair.
Clear as mud.
You may also use an LED as a Zener diode ! a red LED will regulate at about 2 Volts and a blue or white LED will be slightly higher at 3 Volts ... The EHT diode in a microwave oven has many high voltage diodes in its package and might regulate at around 10 Volts ( which is why you cannot test it with a multimeter set to diode test ! ) for MUCH higher voltages a Neon bulb can be used ( 90 Volts ? ) ..... DAVE™🛑
So basically they only allow a certain amount of current to go through them? Depending on the value of the zener diode?
No, the series resistor determines the current. Without the resistor the diode would self destruct. This video is very simplistic.
Nope. They only allow a certain votage to exist across them (within limits) so can be used as a voltage clamp or reference.
Explanation is excellent. But the writing covers the figures. So, difficult to see the figures properly.
Thank you so much. You can turn off subtitles in video settings.
Thank you for the advice. 🙏🙏🙏
Never connect diodes in parallel without balancing resistors.
Agreed.
I would not consider the parallel configuration a 1W Zener. It's a 0.5W Zener that keeps working if one Zener fails. Which is how they are used in safety applications.
Don't use zeners in parallel. I have never seen a circuit that does this. The devices would need to be perfectly matched. Use a bigger zener, they are cheap enough.
How is wattage calculated? Granted it has been a long time since I did any of this stuff. But nothing is ideal and K-laws are here to stay. So some current has to flow and non ideal R of those diodes has to work somehowe with rest of circuit.
he doesn't say that if he puts a larger voltage U across the resistor and the voltage on the zener diode rises, the zener diode short-circuits _maybe 10V on ZD 5V _ZD lets go and it is K.O. _But Voltage regulator is good and working
So it's a cheaper version or economical way to use than a voltage regulator? That's what I learned from your video. And the voltage regulator that you showed is a mosfet which can also control the output of the desired current. Isn't that a pros and cons to it?🤔
No. The voltage regulation is not as good as a regulator chip. There is no thermal regulation and the voltage changes with load and input voltage. The current draw must be known to calculate the series restor because the zener has an operating range. A decent regulator has a vastly improved range over a zener.
Zener-zeener?
Your explanation is fine, but your diagram is not vissible due to the explanation lable!
Difficult to understand,