Basic circuit

Hello

I am not sure is this the right group to post this kind of question, I
hope I am not too much out off topic.

I am quite new to electronics, although I am programming software
already for many years. I understand very basic circuit's schematics,
but for this
http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png
particular one (I saw it on other places also), I am not sure how the
lower right part comes into the circuit. I mean, it is totally
disconnected from the main part of the circuit. What's the purpose of
it and how connects to the other part, can someone explain it to me?

Thanks
Goran

eden wrote:
> Hello
>
> I am not sure is this the right group to post this kind of question, I
> hope I am not too much out off topic.
>
> I am quite new to electronics, although I am programming software
> already for many years. I understand very basic circuit's schematics,
> but for this
> http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png
> particular one (I saw it on other places also), I am not sure how the
> lower right part comes into the circuit. I mean, it is totally
> disconnected from the main part of the circuit. What's the purpose of
> it and how connects to the other part, can someone explain it to me?

VCC_OUT should be VCC or am I wrong ?

Probably, I see now. You mean the arrow in the left up corner near R4,
right? It continues with VCC_OUT. I hope it is like that.

Thanks

Or you mean VCC at pin 10? Now I am confused again. Then what is VCC at
R4?

eden wrote:
> Or you mean VCC at pin 10? Now I am confused again. Then what is VCC at
> R4?

It's the same signal, the arrow indicates a connection.

eden wrote:

>Hello
>
>I am not sure is this the right group to post this kind of question, I
>hope I am not too much out off topic.
>
>I am quite new to electronics, although I am programming software
>already for many years. I understand very basic circuit's schematics,
>but for this
>http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png
>particular one (I saw it on other places also), I am not sure how the
>lower right part comes into the circuit.

IC2, C3, C4, and C5, are a very poorly drawn voltage regulator.

>                                         I mean, it is totally
>disconnected from the main part of the circuit.

It does appear that way, unless you recognize that the node VCC_OUT
should be labeled VCC and connects to the other nodes labeled VCC.

>                                                What's the purpose of
>it

It accepts the 7 to 30 volt input at the bottom and provides a source of
regulated 5 volts for the rest of the circuit.

>   and how connects to the other part, can someone explain it to me?

Again, the node labeled VCC_OUT connects to the nodes labeled VCC and
all of the nodes labeled GND are connected to each other, too.

>Thanks

'Salright.

>Goran


-- 
========================================================================
          Michael Kesti            |  "And like, one and one don't make
                                   |   two, one and one make one."
    mrkesti at comcast dot net     |          - The Who, Bargain

On 23 Sep 2005 00:36:51 -0700, "eden" <goran.burchevski@sicoorp.com>
wrote:

>Hello
>
>I am not sure is this the right group to post this kind of question, I
>hope I am not too much out off topic.
>
>I am quite new to electronics, although I am programming software
>already for many years. I understand very basic circuit's schematics,
>but for this
>http://www.captain.at/electronics/atmel-programmer/atmega16-programmer.png
>particular one (I saw it on other places also), I am not sure how the
>lower right part comes into the circuit. I mean, it is totally
>disconnected from the main part of the circuit. What's the purpose of
>it and how connects to the other part, can someone explain it to me?
>
>Thanks
>Goran

The "mystery part" is a voltage regulator - it will accept 7 - 30
volts, and reduce it to 5 volts for the processor.  The point labelled
"VVC_OUT" should be labelled "VCC".

All the points labelled "GND" are connected together, and all the
points labelled "VCC" (including the mislabelled "VCC_OUT") are
connected together.

When drawing schematics, it is common practice to omit power and
ground lines, and to indicate the connections with "VCC" and "GND"
symbols, or signal names (often called "net labels") to reduce clutter
on the drawing.


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Peter Bennett, VE7CEI  
peterbb4 (at) interchange.ubc.ca  
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Vancouver Power Squadron: http://vancouver.powersquadron.ca

Thanks to all, I appriciate your help. It was really unclear to me, but
now I think I got it.

Regards,
Goran

You probably want to check LS78L05Z datasheet.

I remember that Pin 1 on 7805 is input pin, pin 3 is output pin. But
the schematic suggest pin 1 is the output pin ( that you should label
as VCC).

Check that again, cos making a PCB is expensive and takes a lot of
time, specially in my country :p

kunil wrote:
> You probably want to check LS78L05Z datasheet.
>
> I remember that Pin 1 on 7805 is input pin, pin 3 is output pin. But
> the schematic suggest pin 1 is the output pin ( that you should label
> as VCC).
>
> Check that again, cos making a PCB is expensive and takes a lot of
> time, specially in my country :p

I will do that. Just, I am still searching for the parts. My country is
also very bad in this field (as in many others).
I will probably need to order them over the net. I found them on
www.futurlec.com, disent prices I would say and they accept cheques,
which is a must in my case.

I remeber you from my previous thread in this group, if you remember
AVREasy. I couldn't get it running, so I decided to make something on
my own. Just I can't forgive my self, I paid the board 120 euros, while
they on the above site are around 30-50 $US.

But, I guess we all make such mistakes.

Goran