Bowhunter Well-Known Member Joined Jan 18, 2009 Messages 2,053 Reaction score 1 Jul 11, 2004 #1 I need to know how many Ohm res. Ill need for my Continuity tester and what type of buzzer I built a 8 pad launch controler its at 12vts
I need to know how many Ohm res. Ill need for my Continuity tester and what type of buzzer I built a 8 pad launch controler its at 12vts
Elapid Well-Known Member Joined May 2, 2009 Messages 1,735 Reaction score 2 Jul 11, 2004 #2 on what kind of igniters you're going to be using. you want the current lower than what it takes to fire the igniter by a nice margin.
on what kind of igniters you're going to be using. you want the current lower than what it takes to fire the igniter by a nice margin.
bobkrech Well-Known Member Joined Jan 20, 2009 Messages 8,352 Reaction score 55 Jul 11, 2004 #3 Limit the test current to 20 ma or less. Using ohms law, R=V/I=12/.02=600 ohms for 20 ma, 1200 for 10 ma. Since these are not standard value, use the next highest values. You can use a low current 85dB Piezo Buzzer from Radio Shack @ $4.29, Catalog #: 273-060. Check out this thread for details. https://www.rocketryforum.com/showthread.php?s=&threadid=9120 Bob Krech
Limit the test current to 20 ma or less. Using ohms law, R=V/I=12/.02=600 ohms for 20 ma, 1200 for 10 ma. Since these are not standard value, use the next highest values. You can use a low current 85dB Piezo Buzzer from Radio Shack @ $4.29, Catalog #: 273-060. Check out this thread for details. https://www.rocketryforum.com/showthread.php?s=&threadid=9120 Bob Krech