flyback and signal diodes

Other Hardware General Electronics
1

I have seen several questions in this forum about which diodes to use in different scenarios.

When you need a flyback diode to protect a transistor or FET from reverse voltage
of a motor or relay the best diode is a 1N4001 (up to 50 volts) or 1N4004 (up to 400 volts).

If you need a fast switching diode to protect the input stage of an amplifier or a just a small standard diode you may use a 1N4148.

When switching time is not really important (ns range) i always use a 1N4001.
It is a little bit larger, however, you can easily see the polarity when you look at it.

If you want to protect your Arduino inputs, you might want to use a 5.1 Volts zener diode.
Make sure you use a resistor of at least 100 ohms to protect it from being destroyed by high currents.

arduinoaleman

2

So, that's Holy Writ then is it?
Oh, wait - there's Your note there that You should not be asked questions.

3

Here's a missive that I just got from Der Fuehrer (arduinoaleman):

So what does "Holy Writ" mean?
My English is maybe not as good as yours.
However, my German and my Spanish is probably better than yours.
And I am quite sure you speak only one language.
What is the intent of your message?
I sent you this message as a personal message.
Why do you post such meaningless words in the FORUM??
Do you think that anybody is interested your personal opionion.

Isn't He a hoot?

"Holy Writ" - a writing or utterance having unquestionable authority.

4

Isn't He a hoot?

The Fuehrer speaking

I just asked you a question about the meaning of "holy writ" - and then - such an unexpected answer!!

Did you not understand my words??

I asked you to keep personal things OUT OF THE FORUM.

And whats is wrong with my short contribute in GENERAL ELECTRONICS about harmless diodes??

And why did you post my personal message to you IN THE FORUM ?

In psychology there is an expression called "lack of social competency"

The NON-Fuehrer speaking

I hope that one of the moderators will remove this unbelievable discussion from the forum.

And before this will be deleted - I hope that other persons will tell you that
you are abusing the forum.

5

I feast on your tears.

6

Okay, that's enough of that I think.