Bread board power supply. Home Utility Circuit.16

This Project is for the Circuit designers. Lot of projects are experimented in Bread board and Perf boards before finalising the project. So these projects need a power supply to test. Usually a 9V PP3 battery is used to power the bread board. So here is a compact Portable Power supply unit for the Bread board experiments. The Power supply includes
1. A charger indicator for the 9V rechargeable battery
2. A battery voltage monitor
3. Output sockets for charging and tapping power to bread board.
4. An LED light for the bread board working

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Battery level Indicator. Design Note 35

Usually we use a battery level indicator along with rechargeable battery to monitor the voltage level. If the Lead Acid battery is deeply discharged below a particular voltage level ,Memory effect develops and the battery never attains full charge later. So it is necessary to monitor the safe voltage level in the battery. A 12 volt Lead Acid battery shows 13.8 volts in fully charged condition and it should not deep discharge below 9 volts. If it happens, immediate charging is required to maintain the health of  battery.

TL 431 Shunt Regulator. Design Note 11

TL 431 is an Adjustable Precision Zener Shunt regulator that can be used to get a desired output voltage from a power supply. It’s output voltage can be set to any value between 2.5 volts and 36 volts using a voltage divider comprising two resistors. It can be used to design, Battery Monitors, Battery chargers etc. Along with two resistors, TL431 give a regulated precise output voltage. Here we discuss how TL431 is used to make a Battery monitor for Solar powered Inverter and a 5 volt power supply.

Car Battery Monitor. Beginner’s Trial 14

Monitor your Car battery or Inverter battery with this simple circuit. It always follows the terminal voltage of the battery and gives corresponding LED indications. A 12 volt Lead-Acid battery attains 13.85 volts in full charged condition and Inverter Tubular battery 14.85 volts. So it is necessary to have an idea about the charge status of the battery. If the battery discharges below 10 volts, it needs immediate charging to prevent the deep discharge. The circuit gives three LED indications. If the terminal voltage of the battery rises above 13.5 volts, Red LED lights. If the voltage drops below 10 volts, Green LED lights. If the voltage is normal around 12 volts, both the LEDs remain off.

Battery Status Indicator. Design Trick 17

You can add this Simple Battery Monitor to Inverter circuit or Emergency Lamp circuit to indicate the level of battery. It can be used to monitor 6 volt or 12 volt battery. Two LED indicators are provided. Green LED lights, if the battery voltage is higher than the set level and Red LED lights when the battery voltage drops below the set level.

Battery Charging Reminder

This circuit reminds you when the battery enters into the deep discharge state. It always monitor the terminal voltage of  battery, and activates a buzzer when the terminal voltage drops below 11.5 volts due to self discharge.This is an  ideal circuit to monitor the standby battery which is charging occasionally.

Tristate Battery Level Indicator

Here is a simple but useful battery level indicator to monitor the battery terminal voltage.Efficiency of the battery reflects in its terminal voltage. A good Lead Acid battery will show 13.8 volts in the fully charged state and if it is below 10 volts, the battery needs immediate charging. If the battery voltage goes above 14 volts, it is in the overcharged condition. This circuit uses a two lead bicolour LED to indicate three battery levels. If the voltage is below 10 volts, the Green part of the LED lights and if the voltage is above 14 volts, the Red part lights. If the battery voltage is between 10 to 14  volts LED remains off.