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Archive of posts tagged Battery-Circuits

Battery Backup for SRAM or Microcontroller

Posted by admin on 17 October 2006, 5:48 am

This circuit can be used as a low cost SRAM and Microcontroller-Microprocessor Battery Backup. All the diodes are 1N4148, The diodes prevent battery discharge back to power source. D8 gives a one way path to charge Battery thru R13 which limits current. D4 ensures a one way path of supply to chip when power is [...]

Filed under Embedded-Systems. Tagged 
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Digital 5V Power Supply using L296

Posted by admin on 22 April 2005, 2:57 am

This circuit is derived from an application note of L296, It is a Power Switching Regulator from ST. The advantage of using a switching regulator is that there is not much Heat Dissipation in this circuit.
If you had to build the same with a series regulator, it would be very big due to external [...]

Filed under Power-Supplies. Tagged ,
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Battery Level Indicator

Posted by admin on 31 October 2004, 1:18 am

This circuit uses a LM339 pdf, a quad comparator. LM339 pdf can work on single or dual supplies, it has a open collector output that can drive 15mA, low power consumption. The circuit is an untested design but it should work. I did it as many searches were made in my webpages with these keywords. [...]

Filed under LED-Circuits, Opamp-Circuits, Power-Supplies. Tagged 
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Battery Backup Supply

Posted by admin on 28 October 2004, 7:37 pm

This is a 9V power supply which will work even on power failure. It uses a rechargeable battery and regulators. A transformer with 15-0-15 AC volts output is required.
In the first regulator U1 the output is lifted up by 1.4V and in the second regulator U2 by a resistor divider. In the second regulator [...]

Filed under Embedded-Systems, Power-Supplies. Tagged 
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