Thermal dissipation (heat sinks) information required - Page 2 - Electronic Circuits Projects Diagrams Free

ericgibbs · 20th June 2007, 02:57 PM

hi adnan,

Link, explains the basics of heatsink usage.

http://sound.westhost.com/heatsinks.htm

adnan_m_s · 10th February 2008, 11:57 AM

Dear Hero999

I need your help with a thing or two if it is possiple please
first i need to adjust this circuit to charge a 7AH cealed type battery could I replace the SL100 tr with a triac to have more current for charging the 12V 7AH battery? I have chosen this circuit because it has indicators and autoshutt off features so any advices on this

Hero999 · 10th February 2008, 01:42 PM

No because a triac becomes latched on onces it's triggered.

This circuit is designed for a mobile phone battery with a voltage of around 3 to 6V.

What are you charging the lead acid from?

If it's just your car then just connect it in parallel with a low value resistor to preven huge current from being drawn.

adnan_m_s · 10th February 2008, 06:11 PM

well,
no i will use an 220/14v adaptor i am planning to make an uninterruptable DC UPS that has a cealed back up battery if i used a power transistor instead of SL100 let us say BD137 or 138 of course according to the right type will that give me a more Amperes current ? 800ma for instance ?
how can i replace some parts of the circuit to get what i want? the 39 ohm the transistor the feeding power to be 14 V things like that?

adnan_m_s · 10th February 2008, 06:20 PM

the bottom line is that I need to do the following ,
i need to have this ups draw current fom mains 220V through a bridge rectifier and keep the battery charged and at the same time when main current is off the circuit should immediatley shift to feeding from the 12v 7AH backup battery now i was thinking after resolving the charging issue to make a small circuit with 741 op to switch the battery on to be the main power source once main 220V is off through connecting the inverting input of the op with the main power after a bridge ofcourse, so when main 220 v is off the op circuit will turn on + battery polar to on state and off course the - will always be on anyway as a common but i am not an engineer i am just an enthusiastic guy who is trying to do anything he can so any ideas or diagrams that you can help me with??

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20th June 2007, 02:57 PM	(permalink)
ericgibbs	hi adnan, Link, explains the basics of heatsink usage. http://sound.westhost.com/heatsinks.htm __________________ Eric "Good enough is Perfect" PIC tutorials: Gramo's: www.digital-diy.net/ Bill's: www.blueroomelectronics.com/

10th February 2008, 01:42 PM	(permalink)
Hero999	No because a triac becomes latched on onces it's triggered. This circuit is designed for a mobile phone battery with a voltage of around 3 to 6V. What are you charging the lead acid from? If it's just your car then just connect it in parallel with a low value resistor to preven huge current from being drawn. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

10th February 2008, 06:11 PM	(permalink)
adnan_m_s	well, no i will use an 220/14v adaptor i am planning to make an uninterruptable DC UPS that has a cealed back up battery if i used a power transistor instead of SL100 let us say BD137 or 138 of course according to the right type will that give me a more Amperes current ? 800ma for instance ? how can i replace some parts of the circuit to get what i want? the 39 ohm the transistor the feeding power to be 14 V things like that?

10th February 2008, 06:20 PM	(permalink)
adnan_m_s	the bottom line is that I need to do the following , i need to have this ups draw current fom mains 220V through a bridge rectifier and keep the battery charged and at the same time when main current is off the circuit should immediatley shift to feeding from the 12v 7AH backup battery now i was thinking after resolving the charging issue to make a small circuit with 741 op to switch the battery on to be the main power source once main 220V is off through connecting the inverting input of the op with the main power after a bridge ofcourse, so when main 220 v is off the op circuit will turn on + battery polar to on state and off course the - will always be on anyway as a common but i am not an engineer i am just an enthusiastic guy who is trying to do anything he can so any ideas or diagrams that you can help me with??