Car Battery Charger

This Charger Can't be used as a Power Supply, Without having a battery in place. The Battery MUST be Connected to get power out. Note: This Charger Features a Reverse polarity Indicator. Instructions: Before plugging this charger into the 110 volt line (or turning it on if you use a Switch), FIRST Connect this Charger to the Battery. In doing so, No Damage will occur if the battery is accidently connected in reverse, but the Reverse Polarity LED will light up. If that LED Does light, Reconnect the battery Correctly, than apply the 110 line voltage. Connecting the Line voltage, With a reversed battery connection, WILL Result in Damage. Especially if you don't use the fuse on the output, as shown in the schematic. Although Not Shown in the schematic, A suitable Line fuse would also be advisable.
Car Battery Charger - schematic

There is No Amp-Meter shown, But I would Definately recommend including one in either the positive or negative line, going to the battery. The Transformer, Diodes and SCR, Must be caplable of handling the output current. And Don't use a 10 amp transformer. If you expect to charge battery's at 10 amps, Allow youself a Safety margin! Use a 15 Amp transformer. Also the Diodes and SCR will Definately require a Suitable, LARGE Heat Sink! The 100 ohm trimpot on the PCB sets the Maximum Charge Voltage. To set this Correctly, attach a Fully charged battery to the output. Than using a meter to monitor the output,Set the trimpot to give an output of 14.5 volts at Very Near ZERO CURRENT. I Show a Center Tapped Transformer and two Diodes, But a Single output, 16 Volt transformer could be use with a full wave bridge rectifier. Some manufacturers recommend Charges with a Low Output, AC Ripple content. If this concerns you, You can add a large Filter Cap across the output. However this Capacitor will NOT be Protected by a reversed battery, unless it is connect before the fuse in that line.

Recommended videos

  • How to make a 12 Volt car battery charger
    Duration: 7:23.
  • 12V 10AMP DC Power Supply
    Duration: 12:30.
  • Hack a USB car charger into a variable voltage power supply
    Duration: 6:46.


  • HSToday
    The Energy Independence and Security Act (EISA) of 2007 required improved energy efficiency for battery and external operating in certain modes, including a standby or “no-load” mode. “For example,” SIA explained, &ldqu
     7 December 2016
  • PCWorld
    PCWorld While laptop computers and other mobile devices with batteries have their own uninterruptible (UPS), there are other critical devices in a home that could use a UPS. For example, home routers would be useless during a power outage. A
     7 December 2016
  • iStreetWire
    iStreetWire ... power quality monitoring and metering devices, industrial battery , uninterruptible , programmable power and electrical test equipment, and gas turbine sensors; and dashboard instruments for heavy trucks and other vehicles, as
     7 December 2016
  • SYS-CON Media (press release)
    ... and cooperating factories in Brazil, Argentina, India and other countries, Huntkey has specialized in the development, design, and manufacturing of PC , industrial , surge protectors, adapters and for many years.
     7 December 2016
  • EconoTimes
    EconoTimes is a fast growing non-partisan source of news and intelligence on global economy and financial markets, providing timely, relevant, and critical ...
     6 December 2016
  • Machine Design
    What current options are available for backup power solutions? What alternatives provide a more secure and reliable power source? In which situations would one prefer to use an ultra-capacitor versus an all-in-one multi-power solution? Download
     1 December 2016
  • Nature World News
    Nature World News With the rise of technology and innovation, there had been a number of new devices coming out in the market, but these will all be useless without working batteries and . Because of this, scientists are finding ways to make
     24 November 2016
  • PR Newswire (press release)
    HANOI, Vietnam, Nov. 24, 2016 /PRNewswire/ -- Huntkey Enterprise Group, a leading global power solutions provider, has successfully held a promotion in ...
     24 November 2016
  • SecurityInfoWatch
    SecurityInfoWatch and battery The ELK-P1215 and battery provides reliable power for alarm sounders, strobes, access control readers, door strikes, mag locks, surveillance cameras, water shutoff valves, and more. It can supply up to 1.5
     21 November 2016