If you wanted to, you could attach three more servos to the GPIO pins P8_19, P9_14 and P9_16. They could all share the same external 5-6VDC power supply without any problem.



About the Author.
As well as contributing lots of tutorials about Raspberry Pi, Arduino and now BeagleBone Black, Simon Monk writes books about open source hardware. You will find his books for sale here at Adafruit.