information and inspiration
for students, teachers and hobbyists
About Tools Products Activities Galleries Projects Links Contact Facebook LinkedIn  flickr

 

Assembly and Operating Instructions for HiViz.com Kits

 

Using a 10-turn Potentiometer with a Delay Unit

 

More how-to articles

 

DIYers have asked if they can replace the 100k pot on the Multi-Trigger 3 (or other delay circuit) with a 10-turn pot in order to provide greater precision in adjusting time intervals. The answer is yes. With a 10-turn pot, the precision is better than 15 microsec/deg. By flipping the Delay Range switch on the Multi-Trigger 3 to the Divide by 10 setting, you divide the precision by another factor of 10.

 

Unless you already have a 10-turn pot, buying one new will cost at least 10x as much as a 1-turn pot. If you also want a readout dial on the pot, that's another 10x in price. Here are some sources:

 

10-turn, 100k pot (plastic shaft)

10-turn, 100k pot (metal shaft)

10-turn, 100k pot with turns counting dial

 

Racquetball collisionWhile I've rarely resorted to using a 10-turn pot, there are some situations where it can be useful. I used one to capture successive images of a racquetball striking a wall. I shot the ball from a specially-constructed slingshot in order to project the ball with predictable speed and position. I wanted to capture a dimple in the ball that occurs over a very short time span during a collision, and the precision of a 10-turn pot allowed me to do that. The animated gif to the right is composed of 24 successive still images taken at quarter of a millisecond time intervals. The individual frames are shown below. The dimple I mentioned is shown at 1.75 ms into the collision.

 

Racquetball frames

 

 

 

 

 

 

 

 


About Tools Products Activities Galleries Projects Links Contact Facebook LinkedIn flickr
 
 
copyright © 1995-2019 HiViz.com