Electronics-Lab.com Community

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## Posts posted by Muhammad Abu Bakar

1. ### Datasheet on Woman

Hi Logon!

How have you calculated this ratio?

2. ### Difficulty finding a page within a single thread

Here goes the description of my problem!

I feel problem in accessing a page within a thread. For example if I have to go page 17 of 40 pages thread then I have to follow it sequentially.

If any solution could be found then this site will become many folde easier to browse.

Thanks.

3. ### Why electronics-lab takes longer time to appear

But I can't open more than 5/ 6 pages ata time,  If I do, all of them disappear suddenly I have to start again.  I don't know what the solution might be. I often get the problem " IExplorer has performed illegal operation and will be shut down by windows" :-[

4. ### Projection clock

If you plan to do it yourself then please share the experience at this form. Thanks

5. ### simple question about batt chargers

Hello Walid!
I think temperature is the most critical criteria to stop charging.  If u have lot of experience charging non-rech bats than u can tell us the avg time to charge common cells like AA, AAA or D.  It will be usefull

6. ### Variable AC Dummy Load

Hello Xenobius!

Can you tell us please which kind of source u r using for load test?
A Generator, transformer or something elese..

7. ### Variable AC Dummy Load

Hello Xenobius!

I can remember something about the transformer properties.  IT says

To change the voltage level

v1= (n1 / n2 )*v2

v1=secondary volts
v2=primary volts
n1=secondary  turns
n2=primary turns

similarly it transfers impedence to the other side by!

Z1 = Z2 * (n1 / n2)^2
Z2 = actual impedence at one end
Z1 = Effective transffered resistence at other end.

and u can variation in Z1 with either changing (n1/n2) or Z2
For fixed Z2, using a transformer with taps can help change turn ratio.

An auto transformer can be used for the purpose. ( I have one in my REGULATOR with lot of taps and capable of voltage change upto 50%)

8. ### Active RC Filters' Applications

Active filters are used almost in every analog design.
For example audio amlifiers, data converter (A to D and D to A) interfacing circuits, sample and hold circuit, oscilators and so on....

You should refer any OP-AMP Applications book and it discusses a lot of applications.  Also any data sheet and application of a certaian IC will help a lot ( u can c for LM741)

This book can be helpfull to u (Operational_Amplifiers.rar) at
http://www.electronics-lab.com/forum/index.php?topic=4808.msg29976#msg29976

9. ### Free sample chips!

Hello Dears!

I would request someone with enough time to search Semiconductor Manufacs Sites for Through Hole Packages(Like PDIP TO's) and make a list of these IC's.  I think it will help many of us.

10. ### Bigginers Handbook

A page opens to upload some file.  Perhaps I have to first upload and then dnload ;)
Anyhow the site seems annoying.  Can this site provide a shared password to over form?
Hain Ante?

11. ### Electronic related Books CD, available?

Hello Friends!
I want to have all types of electronics related data(especially e-books) in soft form.

12. ### Variable DC Power Supply

Thanks for the title.
But I am unable to download it from corresponding site.  When I do "Save As" it  gives no response..

13. ### Bigginers Handbook

you DON'T deserve to replace him

Oh! That was just a joke.
However, like audioguru, I also request to upload the book if someone has it.
14. ### Variable DC Power Supply

Audioguru, your electronics is vry strong.  What is ur major source of knowledge? :-\ Would u like to recommend a good book/study material to me to study.  I feel great defficiencies here (although I am BS Electronics engg).  Thanks!

15. ### Bigginers Handbook

Too bad, no book and no moderator for the “Theory articles” column!

Don't worry! I put my services to be the moderator.  Just tell me what a moderator does.  Perhaps, entice newbies for a tempting title and then flee away! :D
16. ### Electronic book online

Please do it as soon as possible ;)

17. ### Problems lately accessing this site

I had the same problem last days but I thought that my favourite site has got an entry in the black list of my ISP ;D ;D.  (as most of those fool sites do).  But I am satisfied now that it was not the case. I suspect logan_dslasher's picture can cause problems for me any time that way too!

Logan I would ask u to change that sign pic of yours

Audioguru u mentioned these methods to avoid acoustic feedback/hawling.

1. hybrid transformer
2. voice switching
3. acoustical echo canceller
4. two-opamps bridge circuit
Kindly give the info about last two techniques and provide circuits of possible.
Thank u

19. ### Simple but sophisticated lab Power Supply

Actually I am annoyed with those bulky high current transformers.  Therefore any circuit which doesn't require a transformer is a SOPHISTICATED circuit to me.

I am looking for high capacity, high voltage non-polar caps to increase current capability.

There r IC's specifically used for dig. data transmission/reception.
TRF6903 (TX+RX) is one such from TI.  U can ask them for samles.

21. ### any pinoy here pm me

If u r powering the sircuit from AC supply, this circuit might help u for dual supply operation.

What is function of SW1?

Which Amplifier IC used in ckt?

23. ### Simple but sophisticated lab Power Supply

I tried this circuit.

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