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1
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by audioguru on Today at 07:11:36 AM »
Thank you for your response!
So what kind of transformer do I needed to have an output of 30 volts and 3 ampere?  ???
How about the parts were left, do I need to change it?
how about the components that will not use, i simply replace them a wire or what?
and Is there any changes in Schematic? Please reply? Thank you!  :)
I guess you did not see the new schematic and parts list on the first page of this thread. If you cannot find the 28VAC transformer then use a 30V/4.2A (126VA) transformer instead.
2
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by luis17 on July 05, 2015, 09:26:11 PM »
Thank you for your response!
So what kind of transformer do I needed to have an output of 30 volts and 3 ampere?  ???
How about the parts were left, do I need to change it?
how about the components that will not use, i simply replace them a wire or what?
and Is there any changes in Schematic? Please reply? Thank you!  :)
3
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by audioguru on July 05, 2015, 04:11:52 PM »
Hi can anyone help
I want to make this project but, I am confused about 169pages of discussions, I don't know what to do.
Last week I try to build it I buy
24v 3a transformer
And all item on list list of parts in this page
In my first try the output is only 25 to 26v
In my 2nd try the tl081 burned
And I have problem in 2n2219 i have old stack and i think its broken and all store in our place don't sell that item anymore can I replace it with other item that have same output
Can you give me the schematic and latest parts list that I need in this project
The latest schematic and parts list is on the first page of this thread.
1) The 24V/3A transformer does not produce enough output voltage and is overloaded if you try to get 3A output from this project.
2) The TL081 opamps operate at a voltage that is higher than their absolute maximum allowed voltage so we replaced them with more modern 44V TLE2141 opamps.
3) The 2N2219 is an antique and gets too hot so we replaced it with a more modern BD139 that van be bolted to a heatsink.
4
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by luis17 on July 05, 2015, 03:26:04 PM »
Hi can anyone help
I want to make this project but, I am confused about 169pages of discussions, I don't know what to do.
Last week I try to build it I buy
24v 3a transformer
And all item on list list of parts in this page
In my first try the output is only 25 to 26v
In my 2nd try the tl081 burned
And I have problem in 2n2219 i have old stack and i think its broken and all store in our place don't sell that item anymore can I replace it with other item that have same output
Can you give me the schematic and latest parts list that I need in this project
5
Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by audioguru on July 04, 2015, 12:32:41 PM »
I answered in your other duplicated post.
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Projects Q/A / Re: 0-30 Vdc Stabilized Power Supply
« Last post by audioguru on July 04, 2015, 12:24:05 PM »
The MC34071 is no longer available in a DIL package. The TLE2141 is made by Texas Instruments and maybe other manufacturers and can be ordered from many sources. Go to www.farnell.com and click on the flag of your country to see a distributor near you.
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Projects Q/A / Re: 0-30 Vdc Stabilized Power Supply
« Last post by fills on July 03, 2015, 11:16:53 PM »
hi MC34071&TLE2141 is not available in my circle will you please suggest me an another suitable ic for this circuit
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Projects Q/A / Re: 0-30V Stabilized Power Supply
« Last post by fills on July 03, 2015, 11:13:48 PM »
hai friends MC34071&tle2141 is not available in my circile will you please suggest me which one is suitable for this circuit
9
Electronic Projects Design/Ideas / Re: on off pulse counter
« Last post by Hero999 on July 02, 2015, 05:29:13 PM »
Well if you're going to use it for other things in the same project, then it makes sense.

There is a C compiler for Microchip but the optimised, unrestricted version is expensive. Atmel have better free development tools.
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Electronic Projects Design/Ideas / Re: on off pulse counter
« Last post by bobleny on July 02, 2015, 02:26:41 PM »
Wow, that is overkill. If you prefer Atmel then something like the ATTINY4 will be much more cost effective.
Yeah, no kidding... I have plans to use USB communication for logging and control of some others aspects of the project. I also plan to make use of the ADC. Plus, I bought it as a Micropendous because it already has the bootloader and everything on it. All I have to do is plug it in to the computer and I can write and test with it without ever unplugging the thing.

The only reason I was drawn to the Atmel was because it allows me to program it in C. I think they may support C++ for some of their stuff as well, but I'm not sure.
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