Questions tagged [schottky]

A Schottky diode typically has a lower forward voltage drop and faster switching speed than a standard silicon diode. Several forms of transistors also use the same Schottky barrier effect such as MESFET to increase switching speed while others include a Schottky diode as a form of clamping.

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32
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2answers
9k views

Schottky transistor, Not sure I understand it?

So I've been looking through and going through my Digital Computer Electronics book, and I came to this... It seems so simple and I understand the "point" of it, but I'm not sure I understand exactly ...
11
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1answer
3k views

Separating USB/MCU power buses

There are two power supply sources in the following diagram - USB and 12V. Only one power supply can be connected at the same time. I am trying to disable power to ...
41
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5answers
15k views

For a lower voltage drop one could use Schottky diodes, but what are the disadvantages of Schottky's?

In other words, why don't we always use Schottky diodes if they are so much better? What diode properties do Schottky diodes have that makes them unfit for certain applications?
3
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2answers
6k views

Do I need a Schottky diode as a flyback diode with PWM @ 30khz?

I use a regular diode (1N4007) as a flyback diode for a 250ma 5v fan. My transistor is a <...
7
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3answers
24k views

Is a Schottky diode appropriate for reverse polarity protection?

To narrow the focus a bit from an earlier question: Is a Schottky diode appropriate for reverse polarity protection? I'd like to prevent mishaps from a user connecting DC power in reverse, but I'd ...
7
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3answers
821 views

Adding Diodes to Transistor Astable Multivibrator; 1N5818 Schottky diodes work but 1N4148 diodes don't; can't figure out why

I am an avid electronics hobbyist, not an electronics engineer. I built a transistor-based astable multivibrator circuit and then fed its output to an op amp buffer amplifier which then drove an 8 ...
3
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1answer
3k views

Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V ...
2
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1answer
2k views

Schottky diode as AM detector?

An old AM radio that passed down to me from my grandparents finally ceased to function after I accidentally dropped it and old parts inside got damaged. I ripped all damaged parts out and replaced ...
5
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1answer
10k views

What is a typical diode's ideality factor?

Some background, for anyone unfamiliar: The Shockley diode equation is \$I_D=I_S·(e^{\frac{V_D}{n·V_T}}-1)\$ with the quantity \$n\$ called the ideality factor, a number between 1 and 2. Ideal ...
3
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2answers
7k views

How should I connect multiple Lithium Polymer battery packs in parallel?

I have an application for which I need a relatively high amount of current @5V. I was thinking of connecting four external USB battery packs like these in parallel, as they output a nice regulated 5V ...
2
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2answers
757 views

Protect ADC input from over-voltage with Schottky diodes

Alan Walsh on this article has suggested using Schottky diodes to protect ADC input from over-voltage, the circuit looks like below: simulate this circuit – Schematic created using CircuitLab ...
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3answers
592 views

How to to Use a Nylon Shoulder Washer?

I'm somewhat curious as to how to use a nylon shoulder washer with a bolt. There is an example of this here (https://electronics.stackexchange.com/a/45579/95654), but I can't figure out how it would ...
1
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1answer
953 views

Does this Schottky provide MOSFET transient protection?

I'm studying the schematic for an electronic load available as a kit from Jameco: http://www.jameco.com/Jameco/Products/ProdDS/2161107%20Schematic.pdf There is a Schottky diode shunting the source-to-...
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1answer
8k views

Why does this schottky diode have three pins [duplicate]

I'm just wondering why this schottky diode have three pins? I know two of the pins acts like rectifier but what does the a third pin do? Source: http://www.digikey.com/product-detail/en/DB3J208K0L/...