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Datasheet/Parts requests / Re: Pins information or Datasheet of an IC
« Last post by audioguru on March 05, 2015, 10:38:16 PM »
I get all my datasheets from www.datasheetarchive.com where I can select from a list of manufacturers. I usually select the manufacturer who invented the IC not a copy-cat manufacturer who has spec's that are missing many details. It is free.
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Datasheet/Parts requests / Re: Pins information or Datasheet of an IC
« Last post by Hero999 on March 05, 2015, 06:17:39 PM »
The circuits are on the datasheets which can be found through a search engine.
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I have tried but I suppose I have to use pic(programmable IC) inside the circuit and do not know how to write code for it. Another problem is that how to check(or calibrate)  after finished.

4
Datasheet/Parts requests / Pins information or Datasheet of an IC
« Last post by Dammy on March 05, 2015, 04:02:12 AM »
How to drive a motor with D6650A or AN6650 IC...
How to drive a speaker with DA2822A IC...
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Theory articles / Re: the finer points of electronics - I
« Last post by pebe on March 04, 2015, 02:42:30 AM »
The equation is wrong, nevertheless. It can only be true when X = 1.
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Theory articles / Re: the finer points of electronics - I
« Last post by KevinIV on March 03, 2015, 11:08:58 PM »
That last post was bad manners.

The equation is great because it is the equation of a voltage divider. x/x+y
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Hello,

I would like to design CO(carbonmonoxide) detector with electrochemical sensor.It should work with 9V battery.I would like to know where I start from?

Thanks.






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Theory articles / Re: the finer points of electronics - I
« Last post by Hero999 on March 02, 2015, 03:49:29 AM »
An interesting equation I found in the opamp power supply I posted.

y/x + 1 = x+y/x
Where does it say that?

What do x & y represent?

Basic algebra says it's untrue. Try putting some numbers into the equation and see.
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Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by audioguru on March 01, 2015, 10:06:10 PM »
I think R7 can be 0.22 ohms. Then when the output is 6.5A the resistor will dissipate 9.3W so a 15W or 20W resistor should be fine.
There are small resistors encased in an aluminum finned case that can be bolted to the metal case and are rated for 25W.
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