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(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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From time to time there are some real gems posted in Electronics Point. Often they are quite hard to search for, so...

If you've seen post that is really good, that explains something really well, or contains information that you think would be of wide interest, post a link to it here. Please include your rationale for its greatness.
 
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(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,505
Joined
Jan 21, 2010
Messages
25,505
H-Bridge chip summary

Kris has put together a list of H-Bridge chips that could serve as a starting point for someone looking to see what was available in this post.

"Most Clever" award.

CDRIVE wishes to nominate this post by KrisBlueNZ for the "Most Clever" award. An award we don't have, but it sounded like we should promote the post! A "heartbeat" oscillator for LEDs.

Programming resources for microcontrollers.

CocaCola has provided a good list of resources that others might find helpful. And others have added to the list. See here.

SMT rework for the "non-equipped".

Whilst I recommend using proper equipment for working with surface mount components, it is unquestionable that many will want to do repairs who don't have this equipment. One of our members was confronted with exactly this problem, researched a solution, and the end result was very professional. See here.

Simple SMPS repair.

This thread is about the repair of a very simple mains powered switch-mode power supply. However people have gone to completely uneconomic lengths to understand it, and so there is much to learn from it. Look here.

Real world SMPS design.

Switch-mode power supplies are non-trivial to design (certainly with respect to linear power supplies). This thread discusses aspects of the design of a smps, concentrating on the design of the transformer.

Homework Help -- doing it right.

Nothing special about the question, or the answer, just a fine example of how to approach both the asking and answering of Homework help issues.

Practical (simple) LM317 design.

Beginner working on an LM317 with great responses about the how and why for certain design aspects can be found. (Suggested by janagyjr)

Wireless alarm sensors.

An unusual battery warning in an alarm system caused by a flat battery in a wireless sensor. (Perhaps not unusual, but the owner didn't realise the sensor was wireless, or that it had a battery).

Drawing circuit diagrams.

There are as many methods of drawing schematics as there are people! Which you choose depends a lot on why you're drawing it.

Reverse polarity applied.

The problems this causes range from nothing at all through to the potential destruction of almost every component.

Here is the story of a particularly expensive piece of equipment -- The person was quotes 1200 Euro for repairs. The repair in this case was relatively straightforward.

Diodes and AC relays

We all know (well we should) about the inductive effects that cause a potentially high voltage spike when power to something inductive like a relay is removed. We typically place a diode such that this does not cause problems. However, what do we do with AC relays? Surely the same problem exists? No -- Duke 37 explains. Check here for the reason and explanation, and also a warning.

Relay contacts and inductive loads.

Here is a great post describing another aspect of diodes and relays. In this case it is dealing with the switching of an inductive load and the suppression of arcs. (Suggested by CocaCola)

Buying your first CRO

An oscilloscope is a really useful tool for looking at what's happening inside your circuits. However the options available are as vast as the price range. What should you be looking at? Here is a thread started by person shopping with a constrained budget.

Heatsink calculations

It is a mistake to think that high power devices can dissipate much power at all without a heatsink. Here is the discussion that involves the selection of a part, then the calculation of the size of the heatsink required. The calculations are done both by rule of thumb and in more detail, then the results are verified in real life.

Fixing a CRO

A successful repair story. In this case the problem appeared to be somewhere and it was worked backward to the power supply. I guess a lesson in making sure the power supply is working :) In any case, it's a good story of tracing things through to the end.

Using temperature (or light) to control a relay

A common question is "How do I use temperature (or light) to turn something on and off?". A major problem is that you generally want to switch positively from on to off and from off to on just once, not have lots of switching on and off when the temperature (or light level) is close to the switching point. Two recent threads show how to do it with an op-amp, and with transistors.

Converting a Log pot to a Linear pot


Jackorocko highlights this thread as one which is so useful he wishes he could make it sticky! The key information is here. This describes how to vary the "law" of a potentiometer in interesting and useful ways.

Lots of Electronics Calculators

A whole stack of electronics calculators can be found here. Thanks to DaveElectronic in this thread, and MattyMatt for suggesting it be kept in a prominent place.

Tools for microcontroller development

Check out OLIVE2222's post in this thread for a list of suppliers and tools (mostly compilers) for microcontroller development

Youtube channel for explanations

A member who was battling Thevenin found a youtube channel which explained a number of concepts in a way that made sense to him. In this post.


 
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