Modify Battery Level Indicator for 12V DC Battery | LM3914 Circuit

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Discussion Overview

The discussion revolves around modifying battery level indicators for different voltage specifications, specifically focusing on a circuit using the LM3914 integrated circuit. Participants seek assistance in altering resistance and capacitance values to adapt the circuits for 12V and 6V battery applications, without including charging circuits.

Discussion Character

  • Technical explanation, Homework-related, Experimental/applied

Main Points Raised

  • One participant requests help to modify a battery level indicator circuit for a 12V DC battery using the LM3914, asking for calculations related to resistance and capacitance changes.
  • Another participant suggests that providing the schematic and specific goals for the circuit modification would facilitate better assistance.
  • A separate participant shares a circuit for an automatic emergency torch that currently uses a 2.4V NiCd battery and expresses a desire to modify it for a 6V battery, also requesting calculations for the necessary changes.
  • There is a follow-up inquiry about the existing battery voltage indicator circuit with the LM3914, indicating a need for clarity on how it relates to the torch circuit modification.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as multiple requests for modifications and clarifications are present, and no specific solutions or agreements have been established.

Contextual Notes

Participants have not provided detailed schematics or specific parameters for the modifications, which may limit the ability to provide precise calculations or guidance.

yournextboss
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Hi there,can anyone please help me modify a battery level indicator that i picked out from the web.Its actually a small circuit that i need to modify without the charging circuit at the end.I need to change any resistance or capacitance if any.If you can help then would it be possible to show me any calculations that had to be done in modifying the circuit.It runs off with a 12v dc battery and uses an ic LM3914.email me if u are interested and i will send a pdf of the circuit.Thanks.
 
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yournextboss,

Welcome to PF!

You are much more likely to get help if you simply post the schematic here and state exactly what you want the circuit to do when finished.

Fish
 
Hello the attachment contains the circuit of an Automatic emergency torch.It has a 2.4V Ni cd battery.I would like to modify it to a 6V Battery.The resistance and capacitance would need to be changed.Could u please show me your calculations when modifying the circuit,thanks :-)
 

Attachments

yournextboss said:
Hello the attachment contains the circuit of an Automatic emergency torch.It has a 2.4V Ni cd battery.I would like to modify it to a 6V Battery.The resistance and capacitance would need to be changed.Could u please show me your calculations when modifying the circuit,thanks :-)

and your existing battery voltage indicator circuit with the LM3914 ? :)

Dave
 

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