Problem I have is this:
I connect the 12V lead acid battery in my car by bolting on the terminal. I think the manual says always connect the negative terminal last.
When I do, there are loads of sparks and sometimes even the alarm goes off. I imagine the main supply rails all over the car transition from a floating state to a constant, stable 12 Volt potential difference via a period of time where there is significant noise / voltage bounce.
Everytime I do this, the car's computer subsequently reports errors with the onboard computer network. From talking to many experienced auto technicians familiar with the model of car, these errors are ubiquitous
I'd like to design a simple circuit which operates something like as follows:
The device has two jumper leads terminated in crocodile clips.
You connect one croc clip to battery -ve.
You then connect the other croc clip to the car's -ve battery terminal lead.
The circuit then applies a clean bounce free connection, 'soft starting' the car from zero Volts across the battery leads, rising cleanly to the full 12 Volts.
Once the supply voltage has been cleanly stabilised onto the car's power terminals, one can bolt up the negative terminal to the battery without sparking & bounce etc.
Once everything's tight, you can then un-clip the croc clips & remove the device.
I'm wondering if something could be done with a handful of capacitors, resistors, transistor or two?
It wouldn't have to handle much current, just whatever the car's permanently connected electrics would require.. immobiliser, clock, alarm, ecu etc
The soft-connect device would be removed before any attempt to draw starting current etc. were made.
Any ideas how to accomplish this or something like it in the easiest way?
Would a massive capacitor across + and - leads before connecting them to the battery work or would that be too simple
I connect the 12V lead acid battery in my car by bolting on the terminal. I think the manual says always connect the negative terminal last.
When I do, there are loads of sparks and sometimes even the alarm goes off. I imagine the main supply rails all over the car transition from a floating state to a constant, stable 12 Volt potential difference via a period of time where there is significant noise / voltage bounce.
Everytime I do this, the car's computer subsequently reports errors with the onboard computer network. From talking to many experienced auto technicians familiar with the model of car, these errors are ubiquitous
I'd like to design a simple circuit which operates something like as follows:
The device has two jumper leads terminated in crocodile clips.
You connect one croc clip to battery -ve.
You then connect the other croc clip to the car's -ve battery terminal lead.
The circuit then applies a clean bounce free connection, 'soft starting' the car from zero Volts across the battery leads, rising cleanly to the full 12 Volts.
Once the supply voltage has been cleanly stabilised onto the car's power terminals, one can bolt up the negative terminal to the battery without sparking & bounce etc.
Once everything's tight, you can then un-clip the croc clips & remove the device.
I'm wondering if something could be done with a handful of capacitors, resistors, transistor or two?
It wouldn't have to handle much current, just whatever the car's permanently connected electrics would require.. immobiliser, clock, alarm, ecu etc
The soft-connect device would be removed before any attempt to draw starting current etc. were made.
Any ideas how to accomplish this or something like it in the easiest way?
Would a massive capacitor across + and - leads before connecting them to the battery work or would that be too simple
