Giant servo kit
The Giant servo kit allows you to turn large motors into servo's that can be easily controlled with picaxe basic's servopos command. WARNING, the kit is a bag of parts and instructions. You must solder it yourself.
There is a higher powered FET version available for $10 more K161B
K165B - GIANT SERVO KIT - This kit is a servo with the same IC but has a beefed up transistor output. Feedback is still by a pot which is supplied in the kit
K161B - FORWARD / REVERSE R/C SPEED CONTROLLER KIT - FET version, more expensive but can handle higher currents without a heatsink.