Electronics > Beginners

Beginner Components?

<< < (5/19) > >>

WattsUp:
Sorry, i found the abbreviations confusing at first as well.
74xx is a type of logic chip. You will usually see something like 74hc595 (shift register), where the hc is the type (high speed CMOS? Can't remember tbh) and the 595 is the actual part. Often you will see the same number with different letters like LS.
BJT is a bipolar junction transistor, AKA a normal NPN or PNP transistor
SMD stands for Surface Mount Device
THT is Through Hole Technology (I should have put THD for continuity but that also stands for something else so I never use it
And BTW stands for by the way!

On your motor driver question, the reason you will normally have an external driver (often a H bridge) is because your micro can't provide enough current through its input/output pins. The motor driver will probably just be some MOSFETS that switch the heavy currents (think of them like relays for this instance).
Ben

WattsUp:
If you google phrases like "Transistor Logic Gates" or "Transistor Computer/Adder" you'll find some decent results. Unfortunately, I can't remember the website I found but I'll look for you. Something you should definitely look at are 555 timer circuits. If you understand the basics, you will be amazed at what you can do with them. Dave used one to mod his Mantis to have an adjustable light.

  About eBay, I understand it can be a lottery, but for people like me who can't afford, or just don't have the option, to use vendors like Digikey, it's a necessary evil. Unfortunately, I am in a position where regular orders are not possible, so I have to buy big packs of parts and hope they will be OK for a future project.
Ben

EDIT: I found this site useful, but Google around and see what works for you - http://www.waitingforfriday.com/index.php/4-Bit_Computer

Simon:

--- Quote from: WattsUp on February 22, 2015, 08:51:33 pm ---  From what I've seen on the forum, there is a general consensus that components on eBay are all bad and doomed to fail. I for one always buy from eBay, as it's the only way I can get stuff. In 3 years, not one part has failed me. I actually think i have bought an ATmega kit thing from you (with crystal, caps and socket?).

--- End quote ---

There is the legitimate question of provenance on ebay. For hobby stuff it's generally good enough and I've had plenty of companies buy from me on ebay with no complaints. my ATmega328 chips come from main wholesale dealers in the Uk or europe, I just buy in big enough quantities to get the price down to sell on for a reasonable price. If an ATMega328 is being sold cheaply and it sounds too good to be true then it is. Chinese suppliers either won't supply them or stop answering emails when i ask if they are genuine.

JacobEdward:
I would have thought a Op Amp would be the solution to a mircocontroller not being able to supply enough Voltage or Current and use transistors to create the H-bridge...

While looking into motors, it seems that I'll need more flexibility with frequency than what my microcontroller can give, is there an easy solution to this?  The core chip on my microcontroller is about $5 and without any of the special code it can output 72 MHtz (it can barely give 5KHtz as it is right now) so I'm not entirely sure why I would need to spend hundreds of dollars on a variable frequency drive to control AC motors...

Simon:

--- Quote from: JacobEdward on February 22, 2015, 09:16:19 pm ---I would have thought a Op Amp would be the solution to a mircocontroller not being able to supply enough Voltage or Current and use transistors to create the H-bridge...

While looking into motors, it seems that I'll need more flexibility with frequency than what my microcontroller can give, is there an easy solution to this?  The core chip on my microcontroller is about $5 and without any of the special code it can output 72 MHtz (it can barely give 5KHtz as it is right now) so I'm not entirely sure why I would need to spend hundreds of dollars on a variable frequency drive to control AC motors...

--- End quote ---

Completely confused there, what micro controller are you using and what are you trying to achieve ?

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod