reading eschematic

[dikkombe]

hello my name is dikkombe and study electronics and have difficulty reading schemes diagrams

[Simon]

and what do you want us to do about it ? 

[deephaven]

hello my name is dikkombe and study electronics and have difficulty reading schemes diagrams

Hi dikkombe and welcome to the forum! Could you post a picture of the schematic you're having trouble with and point out the parts that need explanation.

[Simon]

if it is a large schematic you need to firstly break a schematic into blocks, depending on how much you know about electronics you may or may not know of many basic blocks that are used that have a function in themselves and do something for the overall circuit, so effectively you break the schematic into a block diagram. Hopefully you then know what each block is doing so you can understand the circuit at a block level and component level as well as functional

[Chet T16]

Related to this, on schematics i've seen some connections to ICs have a small circle on them.

From my experience with logic circuits i would say this inverts the signal but not sure what it means in a circuit scematic

[Simon]

what sort of symbol does the IC have, if it is a bow with however many pins the IC has no idea if it is a functional symbol like a flip flop then yes it means active low ie there is an inverter on the input (I think)

[vtl]

Related to this, on schematics i've seen some connections to ICs have a small circle on them.

From my experience with logic circuits i would say this inverts the signal but not sure what it means in a circuit scematic

Its called a bubble and it means its inverted, ie active low

http://en.wikipedia.org/wiki/Logic_gate#symbols

[Chet T16]

Right, so it only tells you how the circuit works.

Simple example:
 http://www.sparkfun.com/datasheets/DevTools/Arduino/FTDI%20Basic.pdf

Looking at that now it would make sense, the reset pin is active low and the led pins sink current.