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The Philippine Electronics and Technology Forum > Analog and Mixed Signal > Electrical Circuits and Devices (Moderators: marcelino, DyoodekS) > Parallel Connection in Transformers
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CHAMBA-LAKAS
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« Reply #20 on: January 18, 2012, 08:16:27 AM »
@ts
try mo maghanap ng orig na lm7805
karamihan na benta ngayon ay lakas uminit
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« Reply #20 on: January 18, 2012, 08:16:27 AM »
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Tukkar
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« Reply #21 on: January 18, 2012, 10:30:55 AM »
This
Quote from: DSM_elektronix_shop on January 17, 2012, 06:10:52 PM
sorry disregard mo po yung first post ko hehehe nagkakamali lang ito po tama 2n3055 sorry...pnp nga pla yung isang un ano ba iniisip ko...



this will not going to produce 5 volts but about 4.4v because of the voltage drop 0.6v -0.7v on the B-E juntion of 2n3055. put a series diode(1n4001) on the pin2 to ground of the regulator to equalize the output to 5volts.
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« Reply #22 on: January 18, 2012, 01:37:57 PM »
Quote from: Positron E+ on January 18, 2012, 06:23:58 AM
galeng talaga ni sir rpz angdami ko natutunan, sir posible rin bang bumaba ang output voltage kapag umiinit yung regulator?

kung nasa loob pa ng thermal limit at current limit, nope. ang voltage cutoff ng 78xx regulator ay based sa current limit at temperature limit, of which, medyo mataas 'yung sa temp limit, tipong babaon na sa kalyo 'yung tab.
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bravokilo
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« Reply #23 on: January 19, 2012, 11:21:29 AM »
USE THIS:
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« Reply #24 on: January 19, 2012, 11:27:09 AM »
OR THIS:
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« Reply #25 on: January 19, 2012, 11:37:55 AM »
OR THIS
 
[img]http://electronics-diy.com/schematics/657/5reg.gif[img]
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Tukkar
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« Reply #26 on: January 19, 2012, 05:29:51 PM »
Tip lang po...merong 7812,7805 etc..regulators na hindi talaga kaya nga 1.5 amp output...look on the middle letter na naka sulat..meron ako 78m05,78m12 that is 0.5a capable only...pang lumapas ang current demand it will automatically cut off. LM7805...series are 1.5A capable.
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« Reply #27 on: January 19, 2012, 05:50:23 PM »
yep, that is why a bypass is in order.
using the 2955 PNP is better than the NPN 3055.
BK
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« Reply #28 on: January 20, 2012, 01:16:05 PM »
Quote from: bravokilo on January 19, 2012, 05:50:23 PM
yep, that is why a bypass is in order.
using the 2955 PNP is better than the NPN 3055.
BK

agree...
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Topaklong
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« Reply #29 on: January 21, 2012, 03:15:38 PM »
Quote from: Positron E+ on January 18, 2012, 06:23:58 AM
galeng talaga ni sir rpz angdami ko natutunan, sir posible rin bang bumaba ang output voltage kapag umiinit yung regulator?

Mag shutdown yun 7805 kung sobra na init. Pero sa situation ngayun ay 750ma lang pala yun transformer. Baka ito muna una bumigay bago mag shutdown yun 7805 pag full load na 1.5A.
Dapat yun transformer capacity ang baguhin. Let's say palitan nya ng 9V 3A.
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CHAMBA-LAKAS
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« Reply #30 on: January 21, 2012, 09:37:09 PM »
Quote from: Topaklong on January 21, 2012, 03:15:38 PM
Mag shutdown yun 7805 kung sobra na init. Pero sa situation ngayun ay 750ma lang pala yun transformer. Baka ito muna una bumigay bago mag shutdown yun 7805 pag full load na 1.5A.
Dapat yun transformer capacity ang baguhin. Let's say palitan nya ng 9V 3A.

no need siguro
hula lang
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