13 May
2013
13 May
'13
9:10 p.m.
On 05/13/2013 06:33 PM, Tony Duell wrote:
Can you stil lget the polarised-coil ones used on telegraph lines?
Really nice devices.
I am unfamiliar with those. Description?
My favorite relays are the "latching" (sorta) ones with the magnets in the
middle and two coils, so no current flow is required to keep it in either one
position or the other. These are commonly used in high-end HP RF equipment,
such as attenuators, so that the heat buildup from keeping a relay closed
won't cause drift.
Do precision relays still have mercury-wetted
contacts? Or have the RoHS
goons eliminated those too?
Mercury-wetted relays are obscenely expensive, but they are still around. I always thoguth it was approrpatie when a local (to
me, then)
elecctronics shop had a few suprlus such relays on sale. The name of the
shop was 'H. Gee'. Seriously.
Nice. ;)
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA