On Sat, 14 Oct 2017 15:42:04 -0700 (PDT), tabbypurr@gmail.com wrote:
>On Saturday, 14 October 2017 16:50:32 UTC+1, bitrex wrote:
>> On 10/13/2017 11:51 PM, John Larkin wrote:
>> > On Fri, 13 Oct 2017 10:36:54 -0700 (PDT), scot@jekdesigngroup.com
>> > wrote:
>> >
>> >> Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
>> >>
>> >> Regards,
>> >> Scot
>> >
>> > How much current?
>> >
>> >
>>
>> What UV LED requires a forward operating voltage of 6.5V? Most "small
>> signal" UV LEDS I've seen have forward voltages of around 4-4.5 volts
>> out to hundreds of mA; not much more than a blue
>
>Even if it does need 6.5v, basic switched mode stepup topology is well known, and if the OP doesn't know it they sure won't be able to design one.
The problem of the power really available on the USB port (whatever he
may want to plug it into in the future) remains. USB-A is a mess, as
everyone here I'm sure is aware.
Reply by ●October 14, 20172017-10-14
On Saturday, 14 October 2017 16:50:32 UTC+1, bitrex wrote:
> On 10/13/2017 11:51 PM, John Larkin wrote:
> > On Fri, 13 Oct 2017 10:36:54 -0700 (PDT), scot@jekdesigngroup.com
> > wrote:
> >
> >> Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
> >>
> >> Regards,
> >> Scot
> >
> > How much current?
> >
> >
>
> What UV LED requires a forward operating voltage of 6.5V? Most "small
> signal" UV LEDS I've seen have forward voltages of around 4-4.5 volts
> out to hundreds of mA; not much more than a blue
Even if it does need 6.5v, basic switched mode stepup topology is well known, and if the OP doesn't know it they sure won't be able to design one.
NT
Reply by bitrex●October 14, 20172017-10-14
On 10/13/2017 11:51 PM, John Larkin wrote:
> On Fri, 13 Oct 2017 10:36:54 -0700 (PDT), scot@jekdesigngroup.com
> wrote:
>
>> Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
>>
>> Regards,
>> Scot
>
> How much current?
>
>
What UV LED requires a forward operating voltage of 6.5V? Most "small
signal" UV LEDS I've seen have forward voltages of around 4-4.5 volts
out to hundreds of mA; not much more than a blue
Reply by John Larkin●October 14, 20172017-10-14
On Fri, 13 Oct 2017 10:36:54 -0700 (PDT), scot@jekdesigngroup.com
wrote:
>Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
>
>Regards,
>Scot
How much current?
--
John Larkin Highland Technology, Inc
lunatic fringe electronics
Reply by whit3rd●October 14, 20172017-10-14
On Friday, October 13, 2017 at 10:36:58 AM UTC-7, sc...@jekdesigngroup.com wrote:
> Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but...
The use of USB as a power source is ... flawed in a number of ways. Fine tuning
is defeated if a different USB port has even a small voltage difference, filtering
of the power is uncertain, current is limited (different sources, different limits),
and software can cut power entirely.
For short uses, batteries are good (and there's no cord to break, tangle, lose). For long
uses, a real power supply, with the right properties for your needs, might be
worth buying. Or building.
Reply by Pimpom●October 13, 20172017-10-13
On 10/13/2017 11:06 PM, scot@jekdesigngroup.com wrote:
> Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
>
> Regards,
> Scot
>
There are plenty of adjustable boost converter modules. Try eBay
or your favourite electronic parts supplier.
Reply by ●October 13, 20172017-10-13
Hi, I have a client who is looking to incorporate a UV led that needs 6.5 V for operation. There is a existing 5V USB power but I wanted to know if anyone had suggestions on how to convert to 6.5 V or some other voltage to drive a UV led.
Regards,
Scot