Our GraviTrack Marble Machine Kit is our newest addition to the Marble-Drop mechanism family. Elegant, swooping hands pass marbles to each other to the top of a sweeping multi-level track, available in either solar or battery configuration! Approximately twice as wide as our spiral Solar or Battery Marble machine kits, the GraviTrack is still desk-top compact but large enough for easy mechanical assembly. Pre-order yours […]
Circuit: Stepper Motor
Dave Hrynkiw
July 12, 2007
This is a neat little one-chip circuit we originally tuned for use with our "SM1" Stepper motors. We've presently sold out of the motor, but this circuit has proved to be a good unidirectional (1-way) driver for small stepper motors. Parts required are:
- 74AC240 Octal buffer chip
- 4 x CP0.1µF capacitors
- 100k resistor
- 2 x 47k resistors
MORE POSTS
Solar Eclipse at SB
Today August 21, 2017, we were treated to about 80% solar eclipse. In spite of the smoke, the weather cooperated so we couldn't miss this event. Pinhole projector boxes were made out of cereal and shipping boxes: Fancy ones were mounted onto a tripod, and a phone camera recording a time lapse video was taped to […]
Catalog glitches...
Grrr... Time to start handing out the 1000 lashes with a wet noodle. There's a few pricing errors in the new catalog 6: The RM2 motor is not 2 for $10.75/ea CDN - it's 1 for $3.40 or 2 for $2.85/ea CDN The SC2422 solar cell is not 2 for 2.55/ea USD - it's 2 […]
The Solarbotics Marble Machine (Battery ...
We are happy to announce the arrival of the Battery Edition Marble Machine. Starting today it is available at our website for backorder, and will be fully available for purchase starting tomorrow May 16. You are probably familiar with its older cousin, the Solar Marble Machine that has a clever circuit that delivers short bursts […]
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Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
Please visit www.P65Warnings.ca.gov for more information. This item was manufactured prior to August 31, 2018.