6 VOLT TO 12 VOLT CONVERTER

6 VOLT DC TO 12 VOLT DC CONVERTER TO DRIVE A SAT NAV ONLY.

While in France on holiday in BBM69 we visited Keith and Carol Fair, (See Holidays 2005).  During our chats Keith Pointed out the possibility of using a DC to DC converter to power a Garmin Satellite Navigator.  Some time later I obtained the hardware then forgot about the project.  However, on sourcing a new charger for BBM I realized that the connection would be ideal for the sat nav project as well.

The charger is an AccuMate 6-12, it is a versatile, 4-step automatic charger and maintainer for 6V and 12V lead-acid batteries.  (See photo 1).

In addition to the standard clips the charger comes with a fused lead that can be permanently attached to the battery terminals (See photo 2).  The lead terminates in a Tamiya connector, I made up a matching socket and lead attached to the board of the converter.  Care is needed as I was using the charging lead socket as a power out connection instead of a power in one.  This reverses the normal male/female positive/negative pin arrangement.  Connect the leads after the isolation switch as the converter draws a small idling current.

CHARGER002

1 CHARGER

BATTERY LEADS001

2 BATTERY CONNECTIONS AND ISOLATOR

 

The DC to DC converter is a TRACO POWER THB 3-0512 This converts 4.5 to 9 volts DC to 12volts DC at a maximum of 250 mA.  This has proved ample to run my sat nav.  We had a proving run with the screen brightness and volume on 100%.  I made it work hard re-calculating as we went along.  I estimate that the converter uses about one amp. (See photo 3).

POWER SUPPLY_edited-4010

3 CONVERTER ON PCB

I have recently looked for the newest version of this converter (TRACO TEL 3-0512) and it is for sale at around £10.40 plus vat.
http://uk.farnell.com/tracopower/tel-3-0512/converter-dc-dc-3w-12v/dp/3842034.
This version has a different pin layout but is basically the same.  A 2 amp slow blow fuse is required on the input side.  I chose to put this on the PCB but it could well be in the input lead.  I also chose to add an LED to indicate power was on.  Only because I had one in the junk box.

I attached the leads with a plug but they could just as well be soldered to the PCB.  The output is through an in car connector to match the Garmin set up.  I use the hole and grommet for the horn cable as an entry to the dash board. (See photo 4).

PCB

SOLDER SIDE OF PCB

 

 

Advertisements

2 Responses to 6 VOLT TO 12 VOLT CONVERTER

  1. Bob Humphrey says:

    Do you need a converter – I run my sat nav off 6 volts (probably 7-8v when charging). The TomTom only needs 3.5 – 5v and when using 12v there is a step down converter in the cigar plug. I have to admit that the electric 12v compressor for the tyres doesn’t run too well, but its enough to pump up a flat tyre and the li-lo bed.
    Bob Humphrey (ExLincs)

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

w

Connecting to %s