Voltage input question

Hi,

I wonder if someone can advise me on something. I have 2, 12v
batteries and an electronic device which requires 19v.

I would like this device mobile and wondered, if connecting the 2, 12v
batteries to make 24v and connecting them to the 19v device, will this
be safe?

Would i damage the device if with the extra 5v?

Regards,

sean

 

[John Musselman]

Can't tell from the information. It depends on the range of voltages your
device is designed to work from. You probably have no way of finding that
out except to go for it.

If your worried, work up from 19V by using some D cells (1.5V).

By the way, your 12V battery is probably 13.8V actually.

John Musselman

<srlock@blueyonder.co.uk> wrote in message
newsqi7815l56kq8safmhlt94e9kc95p0r6rn@4ax.com...

Hi,

I wonder if someone can advise me on something. I have 2, 12v
batteries and an electronic device which requires 19v.

I would like this device mobile and wondered, if connecting the 2, 12v
batteries to make 24v and connecting them to the 19v device, will this
be safe?

Would i damage the device if with the extra 5v?

Regards,

sean

 

[Gar]

Most mobile equipment can handle overvoltages of five to ten percent. Five
percent generally being safe. Since car batteries are actually 12.6 volts
this would give you 25.2 volts with two in series. Therefore:

100 * (25.2 - 19) /19 = 32.6 Percent

You definetely DO NOT want to connect the equipment without reducing the
voltage by 6.2 volts. A high probability exists that equipment damage would
ensue.

<srlock@blueyonder.co.uk> wrote in message
newsqi7815l56kq8safmhlt94e9kc95p0r6rn@4ax.com...

Hi,

I wonder if someone can advise me on something. I have 2, 12v
batteries and an electronic device which requires 19v.

I would like this device mobile and wondered, if connecting the 2, 12v
batteries to make 24v and connecting them to the 19v device, will this
be safe?

Would i damage the device if with the extra 5v?

Regards,

sean