Momentary latching relay 2011-12-29

Just for fun I designed and built this simple circuit which drives a monostable relay by a singol momentary button.
Supplied by 24VDC the circuit works for a 12V-140 ohm coil. The relay should feature a time response of 5 milliseconds or less.

Components
R1 -470ohm
R2 - 22Kohm
R3 - 180ohm - 3W
R4 - 150ohm -3W
C - 470uF
K - relay coil - 12VDC -140ohm - 3 milliseconds


[video=youtube;0tR5nwfENb4]http://www.youtube.com/watch?v=0tR5nwfENb4[/video]