Author Topic: Identifying Electronic Components Polarity/circuit (All About circuit design) (Read 1774 times)

BANNEDMemberAccount · « **Reply #20 on:** June 21, 2011, 11:57:22 AM »

Hi how how to convert 12v to 9 volt without using voltage regulator?

resistor ba o diode ang kailangan?

Philippine Electronics Forum · « **Reply #20 on:** June 21, 2011, 11:57:22 AM »

rdpzycho · « **Reply #21 on:** June 21, 2011, 12:20:19 PM »

^ pwede ka lang gumamit ng resistor kung maliit lang 'yung current na kukunin at consistent 'yung kukunin na current.

'yung diode pwede, mga 4 na series, pero 'di ka sigurado sa actual output voltage. tapos dedepende rin sa init nung diode.

meron namang 7809, mura lang din.

Philippine Electronics Forum · « **Reply #21 on:** June 21, 2011, 12:20:19 PM »

Disabled · « **Reply #22 on:** June 21, 2011, 12:28:37 PM »

resistor tapos zener diode

Philippine Electronics Forum · « **Reply #22 on:** June 21, 2011, 12:28:37 PM »

BANNEDMemberAccount · « **Reply #23 on:** June 21, 2011, 12:40:07 PM »

^thanks +1

kasi sir sa project ko, may problem kapag 12v yung input ko sa 7805, magulo yung output,.

kapag 9v ok ang output pero ang problem nagda-drop yung voltage, kapag nasukat ko na nagdrop na yung voltage ng 9v source ko input sa 7805 at naging 6v nalang, nde na maayos ang output nun project.
sakto sana yung 3.5amperes na 12volt ko. kaya naicp ko wag ng gumamit ng isa pang regulator para nde magdrop.

kapag ba ganito ginawa ko sir magdadrop parin po ba ang output:

12v/3.5A---->7809/1A----->7805/1A------->Project 7107scpl-4 single 7segment LED display
(lm317)
magdadrop parin po ba ang output?

kaya naicp ko gumamit nalang ng resistor or diode

sayang ito lang kasi mga regulator ko
lm340t5,ka78r12,ka7805,lm317,lm340t12.

Philippine Electronics Forum · « **Reply #23 on:** June 21, 2011, 12:40:07 PM »

Disabled · « **Reply #24 on:** June 21, 2011, 12:44:20 PM »

bat magulo output ng 7805 kung 12v input

Philippine Electronics Forum · « **Reply #24 on:** June 21, 2011, 12:44:20 PM »

BANNEDMemberAccount · « **Reply #25 on:** June 21, 2011, 12:55:33 PM »

tama yan sir watch the arrow

may nahanap ako dito <<<<<Dito>>>>>

rdpzycho · « **Reply #26 on:** June 21, 2011, 01:16:17 PM »

teka, dapat ok lang 'yan kahit wala ng regulator in between. na-try mo ba ng actual? kung ayos naman ang rectification at filtering nung 12V, wala dapat problema 'yung 7805. kapag nagsingit ka sa gitna, dapat well computed din siya sa current dahil magbabago ang voltage drop ng resistor depende sa load current.

rdpzycho · « **Reply #27 on:** June 21, 2011, 01:17:56 PM »

Quote from: Red Sonja on June 21, 2011, 12:55:33 PM

tama yan sir watch the arrow

may nahanap ako dito <<<<<Dito>>>>>

check mo 'yung calculator, mA lang 'yung current. at high currents kasi, kailangan ng malalaking zener, which in practice, doesn't exist. mostly kasi for reference or for powering very light loads lang ang zener diode.

BANNEDMemberAccount · « **Reply #28 on:** June 21, 2011, 01:24:13 PM »

Quote from: rdpzycho on June 21, 2011, 01:17:56 PM

check mo 'yung calculator, mA lang 'yung current. at high currents kasi, kailangan ng malalaking zener, which in practice, doesn't exist. mostly kasi for reference or for powering very light loads lang ang zener diode.

oo nga sir pati yung resistor

BANNEDMemberAccount · « **Reply #29 on:** June 21, 2011, 01:26:16 PM »

Quote from: rdpzycho on June 21, 2011, 01:16:17 PM

teka, dapat ok lang 'yan kahit wala ng regulator in between. na-try mo ba ng actual? kung ayos naman ang rectification at filtering nung 12V, wala dapat problema 'yung 7805. kapag nagsingit ka sa gitna, dapat well computed din siya sa current dahil magbabago ang voltage drop ng resistor depende sa load current.

sir napancn ko nun inilagay ko sa 3.5A 12v, umiinit yung 7805 na regulator, tapos iba na ang activity nun project.
paano kaya ito

??? · « **Reply #30 on:** June 21, 2011, 08:22:23 PM »

Lagyan mo ng additional cap filter sa out ng regulator kaya, 104 ceramic o mylar.

rdpzycho · « **Reply #31 on:** June 21, 2011, 08:32:54 PM »

Quote from: Red Sonja on June 21, 2011, 01:26:16 PM

sir napancn ko nun inilagay ko sa 3.5A 12v, umiinit yung 7805 na regulator, tapos iba na ang activity nun project.
paano kaya ito

ano ang load mo at ilang current? pwede ka mag-series ng resistor na malaki para ma-reduce 'yung power dissipation ng 7805. iinit talaga 'yan, kasi ang voltage across sa kanya is almost 13V, 2W lang ang kaya ng TO-220 package, or 0.15A (150mA), iinit na ng todo 'yung 7805.

contrary to popular practice, kapag maliit ang filter cap sa input (lowest voltage at 8V), mas maliit ng konti ang power na kailangang i-dissipate ng 7805.

Disabled · « **Reply #32 on:** June 21, 2011, 08:57:45 PM »

or maglagay ng PNP na transistor para lumaki current

BANNEDMemberAccount · « **Reply #33 on:** June 21, 2011, 09:34:13 PM »

Quote from: Flapjack on June 21, 2011, 08:57:45 PM

or maglagay ng PNP na transistor para lumaki current

wala pa code yan, laro mona akop sa 7-segment

sir yung ang ganigawa ko ngayun sa pic16f877a ko 2n3906, pwedi na kaya yung tapos, sa base naglagay ako ng 10k pwedi na kaya yun?

Quote from: rdpzycho on June 21, 2011, 08:32:54 PM

ano ang load mo at ilang current? pwede ka mag-series ng resistor na malaki para ma-reduce 'yung power dissipation ng 7805. iinit talaga 'yan, kasi ang voltage across sa kanya is almost 13V, 2W lang ang kaya ng TO-220 package, or 0.15A (150mA), iinit na ng todo 'yung 7805.

contrary to popular practice, kapag maliit ang filter cap sa input (lowest voltage at 8V), mas maliit ng konti ang power na kailangang i-dissipate ng 7805.

sir yung apat na els-512idb 7segment ay yung Forward current ay 30mA tapos yung forward peak current ay 160mA, yung icl7107scpl ay 1pA on 25degCen

Disabled · « **Reply #34 on:** June 21, 2011, 09:46:22 PM »

BANNEDMemberAccount · « **Reply #35 on:** June 21, 2011, 09:47:59 PM »

ah kala ko sa 7-segment

thanks +

ilan watts sir kailangan ng resistor?

Disabled · « **Reply #36 on:** June 21, 2011, 09:59:08 PM »

i forgot the wattage

maybe 1/2 or 1 or even higher than that

BANNEDMemberAccount · « **Reply #37 on:** June 21, 2011, 10:34:54 PM »

nde ba mahirap hanapin 2n5956 at 2n3792? ano po equivalent replacement

Disabled · « **Reply #38 on:** June 21, 2011, 10:52:33 PM »

you can use TIPs for the meantime

BANNEDMemberAccount · « **Reply #39 on:** June 22, 2011, 12:57:49 AM »

hi, coding nako pero parang may problem sa cicuit ko

-una off na yung signal sa "A" ng display pero baket on parin?

- two, baket kapag pinutol ko connection ng "DP" wala nang display, may power naman sa Common-Anode, di po ba optional yung?

antok nako

Philippine Electronics Forum · « **Reply #39 on:** June 22, 2011, 12:57:49 AM »

Author Topic: Identifying Electronic Components Polarity/circuit (All About circuit design) (Read 1774 times)

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