Flashing Batteres Circuit
Description. Here is a simple circuit in which an LED will continue flashing as long as
the voltage of the battery to be monitored is above the set level.The transistors Q1 and
Q2 are wired as a complementary astable multivibrator.The circuit can operate from a
voltage range from 6V to 12V. The voltage level at which LED has to stop flashing can be
set by adjusting the preset R4.When the battery voltage reaches the threshold the
flashing frequency decreases and when the voltage goes below the threshold the LED
becomes OFF.The diode D1 is used to compensate the changes in the base emitter voltage
of Q1 due to temperature changes. Circuit diagram with Parts list. Notes. Assemble the
circuit on a general purpose PCB. Batteries from 6V to 12V can be monitored by this
circuit. The diode D1 must be a Schottky diode.
Read more: http://www.circuitstoday.com/category/battery-related#ixzz1PCfjcIQ0
3 Led Batteres Monitor
Description. This is the circuit diagram of a 3 LED bar graph type battery monitor
circuit that is ideal for monitoring the voltage level of an automobile battery.When
battery voltage is 11.5V or less transistor Q1 will be On and the LED D1 will be
glowing.When battery voltage is between 11.5 and 13.5V, the transistor Q2 will be On and
the LED D2 will be glowing.When battery voltage is above 13.5V the transistor Q3 will be
On and the LED D3 will be glowing. Circuit diagram with Parts list. Notes. Assemble the
circuit on a general purpose PCB. The battery to be monitored can be connected between
the terminals namely A and B. It is always better to use LEDs of different colour.
Read more: http://www.circuitstoday.com/category/battery-related#ixzz1PCgjWlRR
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