# Tagged Questions

51 views

### Transient Voltage Suppressor (TVS) Diode Array

I am having a hard time understanding this logic. Please bare with me if my question is very basic. I would appreciate if someone can explain what is happening? If I look into any typical TVS IC data ...
68 views

### Determine material of Zener's diode based on its characteristics

I have a plot log (I) = f(U) for a few diodes: Silicon diode, Germanium diode, some LED and a Zener diode. I need to determine the material, from which the Zener diode is made based on the positioning ...
235 views

### Zener diode can vary current flow to maintain voltage drop, how does this magic effect work?

So it seems that a zener diode is "magically" able to change its resistance to allow more current to pass through it, such that the voltage drop across the diode remains the same. My question is ...
204 views

### Basic comparator strange problem

I am trying to create a super simple Low Battery alert monitor, by utilizing an open-loop comparator. LBO is active-low - it's connected to a TTL input pin of a uC, running from same Vbatt voltage. ...
106 views

### Switching and Zener Diodes

What's the difference between a Zener Diode and a Switching Diode? I.e: 1N4148 (switching) vs 1N5225 (zener).
240 views

### Using Zener Diode for 12v input to Arduino

The MPGuino uses a 5.1v zener diode to read an input from the switching of an injector. According to my very basic understanding of how zener diodes work I used the formula:  I_{diode} = ...
227 views

### Purpose of Zener Diode in Circuit

Can anyone please explain what the purpose of the zener diode is in the circuit shown? The circuit is taken from Figure 3 in the datasheet for the STN1170, an OBDII interpreter IC. simulate ...
126 views

### Zener doesn't seem to be working

So I'm trying to use a zener diode to limit the voltage across a capacitor - specifically, to 2.2V. As you can see, I'm using a 9v supply. The zener is in series with a resistor - either 100 or ...
219 views

### Charging a low-voltage high-C capacitor. Efficiently

I'm currently upgrading my wind-up torch - upon opening it, I found the manufacturers had been quite sneaky in that the circuit is EITHER windup OR battery powered - worse, the batteries are ...
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### Does the line on a zener diode correspond with the line in the symbol?

For a normal diode, the thin line on the component corresponds with the line of the symbol. Is this the same for a zener diode?
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### Using a Zener diode as voltage reference

I want to use a zener diode as a voltage reference to the the PIC18F2550, as the analog V+ reference. I am planning to use this zener diode, but I am not sure how to calculate its values. I am ...
382 views

### v-usb, zener diodes and circuit

I've toying with V-USB for a few days and got a circuit working in a breadboard with a Attiny85 and 3.6 Zener diodes. However, when I tried to get it done in a stripboard, it doesn't work. Assuming ...
889 views

### How to decide between a TVS or Zener diode for overvoltage protection?

I'll leave my specific circuit out of this for a more broad question: What criteria does one use when deciding whether to use a Zener diode or a transient voltage suppressor, for overvoltage ...
756 views

### Zener diode forward voltage

I'm trying to learn how Zener diodes work and I think I get the overall concept (regulating voltage to the zener voltage level), but there's one thing I don't understand. I'm looking at this diode ...
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### Zener Diode three terminal application

I am looking for a three terminal zener diode that can handle at least 125V (DC). Please post links to where I can check out a spec sheet of this component, if it exists.
3k views

### What happens after a zener diode breaks down?

I've strapped a 6V zener diode across the 5V/GND rails of my circuit, and I want to know what will happen if my supply were to somehow fail pass 12V straight to the rest of my board. The zener will ...
4k views

### When/why would you use a Zener diode as a flywheel diode (on the coil of a relay)?

I have just been cogitating on the tutorial at http://www.electronics-tutorials.ws/io/io_5.html, and in the discussion of flywheel diodes it includes this sentence without further elaboration: As ...
2k views

### Zener Diode for Minimum Voltage Regulator

I forgot the name of it, but I remember one post where it said that you can use a zener diode as a "minimum voltage regulator". I don't think I used the right term for it, but here's what I'm doing. ...
1k views

### What happens after a diode is used in breakdown region?

If a diode is operated in breakdown region and if it is used again will it lose its characteristics or work normally?
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### Is there such a thing as a Schottky zener?

I was thinking about this when I was looking for over- and undershoot protection. If you use a zener you can clip the overshoot at a defined level (ignoring the slowness of the zener), but the ...
1k views

### zener diode voltage regulator

(Sorry, my workplace blocks access to the website for the Java based circuit simulator that everyone uses to put helpful schematics in their posts.) I'm having trouble understanding the simple ...