Tuesday, July 14, 2015

Circuit Schematic Battery Level Indicator for 24 Volts Batteries Based on LM339 IC

Eltronicschool. - Here is Circuit Schematic Battery Level Indicator for 24 Volts Batteries Based on LM339 IC like in figure 1 below. This battery level indicator offers (5) LEDs that light up progressively as the voltage increases. This is a variation of the following 12V Battery Level Indicator.

Circuit Schematic

Figure 1. Circuit Schematic Battery Level Indicator for 24 Volts Batteries Based on LM339 IC
(Source: Electroschematics)

Component Parts
  1. LM339 IC
  2. Resistors
  3. Diodes
  4. LEDs
  5. Capacitors

Description

Circuit schematic like in figure 1 above is Circuit Schematic Battery Level Indicator for 24 Volts Batteries Based on LM339 IC. This battery level indicator offers (5) LEDs that light up progressively as the voltage increases. This is a variation of the following 12V Battery Level Indicator like in table below.


Battery Level Indicator Circuit Operation

D1 is the voltage reference zener. Tied to this is a string of divider resistors (R2-6) that set the various fixed voltage levels. R7 & 8 form a voltage divider to that divides the battery voltage by a factor of 6. U1 is an LM339 quad comparator that compares the various voltages from the two dividers. The comparator sections have open collector outputs that simply function as switches to operate the LEDs. D7 protects against reverse battery connection.

The LM324 op amp should work OK, but the pin-out is different—and (4) LM741 op amps should also work OK. Please read more this description from original source using link here.


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