[Paparazzi-devel] about relays

[Chris]

For those who will add relays don't forget to add a fast recovery diode 
(a  Schottkey 1N5819 will do)
paralleled  with a 0.1 microfarad capacitor at the relay's solenoid 
(energizing coil)  terminals.
The diode's anode goes to relay's "-" and the cathode to "+" so the 
diode is reverse biased.
The relay's coil acts as a high voltage generator when the current is 
cut and i have measured
generated voltages in excess of 3Kv.
I am sure you all knew that but just to be safe.....
Chris