Re: Relay Recommendation
- From: Jasen Betts <jasen-b@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 1 Nov 2005 18:48:07 +1300
On 2005-10-29, Captain Blammo <eas6@xxxxxxxxxxx> wrote:
> I'm trying to put together a protective device for the hotshoe on my digital
> camera. All that triggering an external flash requires is connecting its two
> terminals together through the camera, but most digicams will fry if exposed
> to more than 6v fed down the line by the flash unit.
that's a silly design...
> I'm thinking that one or two AA batteries and a relay connected to the
> camera would be just fine to protect against overvoltage, but the relay
> needs to operate as close to instantly as possible and be able to pass
> voltages from, say, 3 to 1000v on the flash unit side with no ill effect.
you'll need something faster than that, possibly something with an
opto-coupler.
> I had a look in the digikey catalogue, and just ended up getting confused by
> the vast array of relays and mystery variables listed with them. Since I'll
> be staking the life of the irreplaceably expensive camera on this, I was
> wondering if someone could do me a huge favour and recommend the appropriate
> part.
it's likely none of the relays will be fast enough unless they're
solid-state relays.
I'd just use the hot shoe as is unless it's documented somewhere that this
is a bad idea... if the camera fails demand a refund.
Bye.
Jasen
.
- Prev by Date: Re: Capacitors 101.
- Next by Date: extend life
- Previous by thread: Re: Relay Recommendation
- Next by thread: Re: First steps..
- Index(es):
Relevant Pages
|
