+- Austinsevenfriends (https://www.austinsevenfriends.co.uk/forum)
+-- Forum: Austin Seven Friends Forum (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=1)
+--- Forum: Forum chat... (https://www.austinsevenfriends.co.uk/forum/forumdisplay.php?fid=14)
+--- Thread: Car charger (/showthread.php?tid=2961)
Pages:
1
2
RE: Car charger - Tony Press - 19-06-2019
Isn't there something about needing negative earth ?
RE: Car charger - Andy Bennett - 19-06-2019
Tony
If you use an insulated socket then it doesn't matter as you are just providing a 6v potential difference across the lighter socket. The earth of the socket then simply becomes -6V and in practical terms 0 to the sat nav, and the 'positive earth' of the A7 is providing a potential difference of +6V.
That's why you must use an insulated socket so that you don't put 6v positive from the A7 bodywork to the earth of the socket/sat nav.
As i noted, some have previously noted an initial voltage surge due to the lack of any voltage regulation which can damage the sat nav, but I have not experienced any problems in 10 years.
Andy
RE: Car charger - Bob Culver - 19-06-2019
I am now out of touch with such matters, but there is a huge amount of radio interfernce under the bonnet of completely unsuppressed cars. Dunno if any spikes find their way thru the bulkhead but a bypass capacito or shielded cable may reduce any spikes.
RE: Car charger - "Slack Alice" Simon - 19-06-2019
Just put a capacitor across the terminals, as close as you can get it to the output socket.
This short circuits anything that isn't direct current - so cuts down the interference.
If you can use a capacitor that will do in (or just outside) the distributor - very good. A neat way of carrying a spare.
I bought an indicator unit from a well known supplier, along with LED festoon bulbs.
They are lovely and bright, but wouldn't work properly until I put the capacitor across the unit as recommended in the instructions.
Simon
RE: Car charger - Roland Alcock - 19-06-2019
I use one of these from Amazon. It is insulated.
Idealeben Dual Car Cigarette Lighter Socket Splitter 12V 24V Charger Power Adapter
£15.
Roly
RE: Car charger - AustinWood - 20-06-2019
The socket I have was for use on boats. It's waterproof and has the facility to disengage the charger without removing it from the socket. It also has a cover for when it'd not in use.
RE: Car charger - John Mason - 20-06-2019
My socket is one for a motorcycle which allows you to mount it on a flat surface without cutting out the large whole in the dashboard. It is also waterproof..
John Mason