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Author Topic: Basic Electrical Components  (Read 6506 times)

Offline gorex

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Re: Basic Electrical Components
« Reply #220 on: May 29, 2012, 09:10:33 PM »
sa audio output transistor pag high ft mas maganda tumonog. kaya mga bagong modelo na solid state amps poro high ft lalo na yung mga sanken output transistor.yung home theatre na denon na new model tingnan mo link.

http://www.crutchfield.com/p_033AV1913/Denon-AVR-1913.html?tp=179
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

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Re: Basic Electrical Components
« Reply #220 on: May 29, 2012, 09:10:33 PM »

Offline rdpzycho

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Re: Basic Electrical Components
« Reply #221 on: May 29, 2012, 10:55:20 PM »
nasagot na yung ft sa taas. :D yun yung point na hindi na nag-act as gain device yung transistor. design point of view, dapat mataas siya compared to working frequency, bago pa kasi umabot ng ft, pababa na yung gain.

mas mataas ang ft, mas mabilis din ang transistor. mas madali rin siyang mag-oscillate sa uba-ibang frequency.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
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"For every difficult problem there is always a simple answer and most of them are wrong."
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Re: Basic Electrical Components
« Reply #221 on: May 29, 2012, 10:55:20 PM »

Offline rdpzycho

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Re: Basic Electrical Components
« Reply #222 on: May 29, 2012, 11:00:28 PM »
minsan merong nakalagay na Vcb at Veb (non_, maximum reverse voltage na kaya yun.

Vce sat - Vce voltage kapag saturated yung transistor
Vbe sat - Vbe kapag saturation

hfe - gain siya nung transistor, taken sa small signal model. meron namang values for different Ib, Ic, etc. minsan pati frequency.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Philippine Electronics Forum

Re: Basic Electrical Components
« Reply #222 on: May 29, 2012, 11:00:28 PM »

Offline ΔЅịMø

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Re: Basic Electrical Components
« Reply #223 on: May 29, 2012, 11:03:39 PM »
At meron din po atang saturation current sir, Icsat. Kung saturated ang Ic, switch ang role nya. Meron din po atang cut-off at amplifier.

Tama po ba sir rd? Naalala ko lang kasi yan sya nung tinanong namin yung prof namin about sa driver ng relay.
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Re: Basic Electrical Components
« Reply #223 on: May 29, 2012, 11:03:39 PM »

Offline ???

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Re: Basic Electrical Components
« Reply #224 on: May 29, 2012, 11:13:08 PM »
O prof dami ko na contributing questions ha.

Another

1. Is hfe = beta ? or likely equal ?
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

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Re: Basic Electrical Components
« Reply #224 on: May 29, 2012, 11:13:08 PM »

Offline gorex

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Re: Basic Electrical Components
« Reply #225 on: May 29, 2012, 11:21:30 PM »
O prof dami ko na contributing questions ha.

Another

1. Is hfe = beta ? or likely equal ?

"βF or hFE"; it is approximately the ratio of the DC collector current to the DC base current in forward-active region. beta = Ic/Ib , Ic= beta x Ib
We use negative feedback in audio amplifiers to stabilize the gain, increase the bandwidth,lower the output impedance and lower the non-linear distortion.

Offline ???

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Re: Basic Electrical Components
« Reply #226 on: May 29, 2012, 11:30:51 PM »
Is this a good read for basic?

? ? ? : Transistor
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

Offline zrehtiek/keitherz

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Re: Basic Electrical Components
« Reply #227 on: May 29, 2012, 11:33:38 PM »
hmmm. actually yung hfe case sensitive nga yan e. ;D
let's see, kung tama ang pagkakaintindi ko, ganito siya.

hfe and hFE applies to ac characteristics while beta applies to dc characteristics.

hfe - applies to the small signal region
(that small signal region na pwede mong imodel yung transistor as linear dahil wala masyadong pagbabago sa characteristics ng transistor)
hFE - applies to the large signal conditions
(ito na yung madalas iconsider kung gagamitin mo yung transistor as a switch, yung during full on and full off regions)
beta - static DC current gain
(self explanatory, and yes, beta = hFE)

tama ba mga masters? ;D

Offline ΔЅịMø

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Re: Basic Electrical Components
« Reply #228 on: May 29, 2012, 11:39:13 PM »
O prof dami ko na contributing questions ha.


Oo nga sir e. ;D
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Offline rdpzycho

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Re: Basic Electrical Components
« Reply #229 on: May 30, 2012, 12:18:05 AM »
At meron din po atang saturation current sir, Icsat. Kung saturated ang Ic, switch ang role nya. Meron din po atang cut-off at amplifier.

Tama po ba sir rd? Naalala ko lang kasi yan sya nung tinanong namin yung prof namin about sa driver ng relay.

yung Ic sat, ikaw ang bahala doon. depende sa circuit mo.

cutoff yung opposite ng saturation. off siya.

active region yung amplifier.

tama si keitherz, hFE yung typical na nasa general purpose  transistor datasheet. hfe yung actual kapag ginagamit ba sa amplification. merong mga datasheet na kasama yung hfe in frequency ranges, lali na sa RF transistor.
‎"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
- Rene Descartes

"For every difficult problem there is always a simple answer and most of them are wrong."
- Clayton Paul

Offline ???

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Re: Basic Electrical Components
« Reply #230 on: July 15, 2012, 09:26:01 PM »
Dagdagan ko lang at buhayin etong thread.

? ? ? : Basa Mode Here

This may help alot pulot ko lang.
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

Offline akositado

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Re: Basic Electrical Components
« Reply #231 on: July 18, 2012, 01:17:33 AM »
+1 sis ??? very informative ung link. bookmarked ko na for future reading. :)

Offline kaiky14

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Re: Basic Electrical Components
« Reply #232 on: July 18, 2012, 02:09:20 AM »
binasa ko nga rin ung link hehe nice one sis

Offline ???

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Re: Basic Electrical Components
« Reply #233 on: July 18, 2012, 02:09:33 PM »
salamas sa +1.  Busy pa kasi ang prof natin.
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

Offline j a y k e z

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Re: Basic Electrical Components
« Reply #234 on: July 18, 2012, 02:23:20 PM »
salamas sa +1.  Busy pa kasi ang prof natin.

+1 sis

substitute prof ka na  ;D ;D ;D ;D

Offline ???

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Re: Basic Electrical Components
« Reply #235 on: July 18, 2012, 02:28:44 PM »
no sis i cant replace her....  ;D

nakita ko lang baka makatulong sa mga sis natin at mga newbing katulad ko.
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

Offline Min

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Re: Basic Electrical Components
« Reply #236 on: July 18, 2012, 02:45:54 PM »
ganda nahalungkat mo nato sis. plus 1 sayo. 278+1=279
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Offline ???

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Re: Basic Electrical Components
« Reply #237 on: July 18, 2012, 03:02:55 PM »
^Halos kumpletos rekados na ba? Pakicheck nyo na lang sis kung may error man siya.
*http://www.elab.ph/forum/index.php?topic=33717.msg632945#msg632945
*http://www.elab.ph/forum/index.php?topic=37150.0

Offline Min

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Re: Basic Electrical Components
« Reply #238 on: July 18, 2012, 03:11:12 PM »
Kumpleto na! Matututo na kami dito.  ;D ;D ;D

Ganda explanation,detalyado.
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Offline centOS

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Re: Basic Electrical Components
« Reply #239 on: July 18, 2012, 04:19:52 PM »
wow ayos ahahaha thanks thanks bookmarked na ;) 
Jesus is like a software. He enters your life, scan your problems, edits your tension, downloads solutions, deletes your worries & saves you...

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Re: Basic Electrical Components
« Reply #239 on: July 18, 2012, 04:19:52 PM »

 

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