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Author Topic: Digital alarm clock  (Read 4537 times)

Offline ahlburuto

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Digital alarm clock
« on: June 04, 2008, 09:04:00 PM »
Me nabili akong alarm clock sa tiangge. 100petot lang. supply nya eh 3pcs of AAA battery. gusto ko sanang lagyan ng 7805, tapos gawin kong supply eh yung centralized 12volts ko dito sa bahay. pano ko kaya mgawang 4.5volts pa yung output ng 7805? any idea po?

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Digital alarm clock
« on: June 04, 2008, 09:04:00 PM »

Offline mArKhAo

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Re: Digital alarm clock
« Reply #1 on: June 04, 2008, 09:05:41 PM »
zener diode. pwd?  ???
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Re: Digital alarm clock
« Reply #1 on: June 04, 2008, 09:05:41 PM »

Offline ahlburuto

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Re: Digital alarm clock
« Reply #2 on: June 04, 2008, 09:12:15 PM »
any schematics?
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Re: Digital alarm clock
« Reply #2 on: June 04, 2008, 09:12:15 PM »

Offline 1110000

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Re: Digital alarm clock
« Reply #3 on: June 04, 2008, 09:13:52 PM »
mas madali kung 7809 na lang tapos lagyan mo ng resistor voltage divider

BTW ano nga pa lang klase yan? LCD ba? LED?
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Re: Digital alarm clock
« Reply #3 on: June 04, 2008, 09:13:52 PM »

Offline ahlburuto

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Re: Digital alarm clock
« Reply #4 on: June 04, 2008, 09:17:40 PM »
LCD with LED. pano schematic nun? pag 7809?

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Re: Digital alarm clock
« Reply #4 on: June 04, 2008, 09:17:40 PM »

Offline mArKhAo

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Re: Digital alarm clock
« Reply #5 on: June 04, 2008, 09:19:44 PM »
current mababago pag voltage divider.. ok lng siguro yan
 ;)
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Offline 'yus

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Re: Digital alarm clock
« Reply #6 on: June 04, 2008, 09:38:20 PM »
LM317 na lang gamitin in stead of 78xx series, kung 4.5V ang desired output voltage..
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Offline ahlburuto

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Re: Digital alarm clock
« Reply #7 on: June 04, 2008, 09:40:08 PM »
Quote from: julznc on June 04, 2008, 09:38:20 PM
LM317 na lang gamitin in stead of 78xx series, kung 4.5V ang desired output voltage..


paano naman iskarte dito?

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Offline mArKhAo

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Re: Digital alarm clock
« Reply #8 on: June 04, 2008, 09:41:52 PM »
merun sa specs.  ;)
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Offline 1110000

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Re: Digital alarm clock
« Reply #9 on: June 04, 2008, 09:46:53 PM »
Quote from: ahlburuto on June 04, 2008, 09:17:40 PM
LCD with LED. pano schematic nun? pag 7809?

br

eto very simple lang

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Offline mArKhAo

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Re: Digital alarm clock
« Reply #10 on: June 04, 2008, 09:49:01 PM »
express pcb?? ??? :D
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Offline 1110000

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Re: Digital alarm clock
« Reply #11 on: June 04, 2008, 09:49:23 PM »
yup :D ;)
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Offline 'yus

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Re: Digital alarm clock
« Reply #12 on: June 04, 2008, 09:50:59 PM »
Quote from: joseph@elab on June 04, 2008, 09:46:53 PM
eto very simple lang


hindi advisable ang ganitong linear reg configuration..  ::)
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Offline mArKhAo

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Re: Digital alarm clock
« Reply #13 on: June 04, 2008, 09:52:00 PM »
Quote from: julznc on June 04, 2008, 09:50:59 PM
hindi advisable ang ganitong linear reg configuration..  ::)
ayan, dapat kasi hnd mo ginawa sa express pcb hehe...
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Offline 1110000

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Re: Digital alarm clock
« Reply #14 on: June 04, 2008, 09:54:04 PM »
hehehe malaki ang looses pero safe kahit mag shortcircuit yung IC mo 6V pa rin yung output :D
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Offline ahlburuto

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Re: Digital alarm clock
« Reply #15 on: June 04, 2008, 09:54:35 PM »
Quote from: julznc on June 04, 2008, 09:50:59 PM
hindi advisable ang ganitong linear reg configuration..  ::)


any reason kung bakit?

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Offline 'yus

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Re: Digital alarm clock
« Reply #16 on: June 04, 2008, 09:54:47 PM »
Quote from: mArKhAo on June 04, 2008, 09:52:00 PM
ayan, dapat kasi hnd mo ginawa sa express pcb hehe...

i'm referring dun sa voltage divider resistors.. 4.5V nga ang output nyan 'pag equal yung dalawang resistors, pero pag may load na babagsak na yung output voltage..  ::)
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Offline mArKhAo

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Re: Digital alarm clock
« Reply #17 on: June 04, 2008, 09:56:24 PM »

 ::)
hehe..
 :-*
dapat kasi sa multisim.  :P
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Offline 1110000

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Re: Digital alarm clock
« Reply #18 on: June 04, 2008, 09:56:35 PM »
pede rin LM7805 tapos lagyan mo ng resistor voltage divider para maging 4.5V ;)
Quote from: julznc on June 04, 2008, 09:54:47 PM
i'm referring dun sa voltage divider resistors.. 4.5V nga ang output nyan 'pag equal yung dalawang resistors, pero pag may load na babagsak na yung output voltage..  ::)

dapat correct yung total resistance nung dalawa para ndi bumagsak yung output :P
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Offline ahlburuto

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Re: Digital alarm clock
« Reply #19 on: June 04, 2008, 09:57:00 PM »
Quote from: julznc on June 04, 2008, 09:54:47 PM
i'm referring dun sa voltage divider resistors.. 4.5V nga ang output nyan 'pag equal yung dalawang resistors, pero pag may load na babagsak na yung output voltage..  ::)

ah ganun ba....

so anu kaya yung pinakamagandang design ng regulator kung 4.5volts required mo?

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Re: Digital alarm clock
« Reply #19 on: June 04, 2008, 09:57:00 PM »
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