-1
votes
2answers
144 views

Do any commercially available generic circuits use only discrete components? [closed]

I'm currently toying with embarking upon a totally crazy hobby project, which would prohibit the use of any component that cannot be 100% verified manually: obviously this completely rules out all ...
-6
votes
1answer
118 views

AN7323 what does it do? [closed]

Does anybody know what this chip does? I can't find a datasheet I think it is a ADC and could use it a lot, if it is. But need a sheet :P
2
votes
1answer
181 views

What is this component C21SC?

This small IC puzzles me, as I can't find any datasheet and even get an idea what it is. "C21SC" and "P134" are printed on top of it (it's SOIC8 package, if I am not mistaken): Googling produced no ...
3
votes
4answers
942 views

Widely available IC for encording and Decoding DTMF data

I am planning to do some research in data transmission over the air. For this I am interested in DTMF encoding and decoding. Is there a widely available IC to achieve this? A circuit diagram using ...
3
votes
1answer
840 views

Understanding CS5463's acquisition circuit

We can consider this question to be the sequence of this previous one. Now I'm working on the current and voltage acquisition part (red marker) of the CS5463 (datasheet). The CS5463 is an ...
8
votes
1answer
885 views

Understanding CS5463's basic circuit power supply

I'm trying to put the CS5463 chip functional using the example circuitry on page 41 of the datasheet (attached bellow): Right now, I'm working on the top part of the circuit, which is the IC power ...
4
votes
2answers
454 views

Replacements for a 4006 IC?

Im building a Nintendo 64 to PC adapter as outlined in this guide. It calls for two 4006 ICs. RadioShack did not have this type, but I was told the following two would work: LM339 or a LM324. Will ...
1
vote
2answers
143 views

End of Life Component Source needed [closed]

Where is the best source on the web to find authorized excess and end-of-life components?
2
votes
1answer
1k views

What is the fastest 7400 series family? Is 74VHC faster than 74AHC?

What is the fastest 7400 series logic family? Is 74VHC* faster than 74AHC*? This list does not seem to be in any particular order: http://en.wikipedia.org/wiki/7400_series
0
votes
1answer
230 views

How to properly store components efficiently and effectively [duplicate]

Possible Duplicate: What's the best way to store and categorise resistors/capacitors/ICs/etc? I have MANY resistors and many other components as well and currently I am using a very ...
4
votes
2answers
356 views

Are there any convenient “bus keeper” or “bus hold” chips?

Many CPLDs have a handy feature which will weakly drive pins toward their present state, so that a pin which is weakly pulled high will pull high and one which is weakly pulled low will pull low. Are ...
41
votes
3answers
7k views

What kind of components are black blobs on a PCB?

In low-cost mass-produced items I often run into black blobs of what looks like resin applied directly on top of something on the PCB. What are these things exactly? I suspect this is some kind of ...