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About goldsmith

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Areas of Interest
Area of specialization:
Power Electronics
Optional Info
Biography:
Hello . I'm Ali Reza . date of birth :Monday, March 2, 1992
I Love electronics and German language !
Location:
Tehran - IRAN
Interests:
Amplifiers /Transmitters / SMPS /Linear PSU / Oscillators / Filters /Inverters / Converters / ...
Occupation:
Freelance analog designer/teacher

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View goldsmith's Blog

Recent Entries

How most of the sine wave oscillators are working

by goldsmith on 28th December 2015 at 00:49
Hi friends !
After a long time a came back again !

I want to share you some simple literature ( my own handwriting ) about control systems and oscillators but believe me i tried to make it as simple as i think simpler than this is impossible !

Ready ?

Here i share you 16 pages ! read em and ask me if there is any question .

1st page :
http://s6.picofile.com/file/8229716818/Scan_Pic0021.jpg

2nd page

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A crystal oscillator in series resonant mode

by goldsmith on 23rd April 2013 at 04:35
Hi all
And thank you so much for reading my blogs .
After a long time since i've promised to write something about crystal oscillators i'm here again .

All right , here we can see a simple common base amplifier which it's base has been bypassed through the ground as well :
http://s4.picofile.com/file/7736383973/CB_amplifier.jpg

So if we replace RC with a tuned network it will behaves as a narrow band amplifier .
See here please :

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Updated 23rd April 2013 at 18:30 by goldsmith

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How to set a quartz crystal for series and parallel resonant mode ?

by goldsmith on 11th September 2012 at 15:07
Dear All
Hi
Thank you for reading my blogs .
As it was my question for long times , and as i understood it is question of many of peoples , when i found it's answer i have decided to put it as simple as possible here . and before that i want say thank you very much to my best friends that helped me to understand it .
Well lets start : we have a Crystal , it is a mechanical element but according to the behavior of this element we can model it with electrical circuits

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Some notes about creating requirements of SPWM and PWM

by goldsmith on 28th March 2012 at 19:58
Dear All
Hi
I came back again , with some good things !
And if you see i don't write all things at one , blog , the reason is that i want you think about things that i write carefully .
Before that , let me appreciate from "LvW" and "FvM " and "syncopator " , because of their friendly helps to me .

Anywhere , for PWM , if we don't want use ne555 or some other integrated circuits , ( because of some reasons ...) we will have

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Updated 30th March 2012 at 09:37 by goldsmith

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Spectrum of SPWM and PWM signal and how to detect the message of those

by goldsmith on 17th March 2012 at 22:11
Hi All
I came back again , as i promised .
Thanks for reading my blogs.
Well , the PWM ( pulse width modulation ) consist from DC component ( DC as message ) and High frequency components .
And SPWM ( sinusoidal pulse width modulation ) consist from message signal and high frequency sidebands .
According to the Shannon-Hartley Law , the frequency of message signal should be about 2Fm that Fm is message signal ( e.g your voice )( remember that each non sine wave

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