Useful for controlling motors and lamps when either the current is too much
for a TIP120 transistor or you don't want the voltage drop across the transistor
or you need bi-directional current through the switch.
- Jameco 174377 ($2.50)
Coil: 12V, 270 ohms, 44mA
Comments: Great for bi-directional motor control. Sold at
the Robot Store.
- Jameco 174431 ($1.50)
Coil: 12V, 400 ohms, 30mA
Comments: Great general purpose relay. Can carry high current. Sold
at the robot store.
- Radio Shack 275-249 ($3.99)
Coil: 12V, 200 ohms, 60mA
Comments: Drive with 2N3904 or TIP120 transistor. Can handle lots of contact
current. Use to reverse direction of a motor. Remember that it is drawing
60mA of coil current from your battery when energized. Buy at any Radio
- Radio Shack 275-232 ($2.49)
Coil: 5V, 250 ohm, 20mA
Comments: Can drive straight from a Stamp pin. Control motors, lamps, solenoids...anything
which requires less than 1A of current. If load is greater than 1A, relay
freezes open or closed and contacts melt. Most motors at stall will draw
more than 1 amp and could not be used with this relay.