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???
03/21/06 14:11
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#112677 - Reed problem
Responding to: ???'s previous message
I'm not sure what the current draw was. This was a long time ago when I built a computer based on a RCA 1802 CPU. The portable tape player was my "mass storage" and therefor required computer control over the transport motor. A really wild guess would probably put the current draw somewhere around 100-200 mA @ 3 volts. I probably exceeded the the reed current rating but found the "latching" phenomenom interesting and puzzling. I only bring it up here because with the relatively heavy current load Suresh is trying to switch with his reed switches he may run into the same problem. Just to rephrase the problem I had was that once current flowed through the reed switch I was unable to open the switch until I opened the motor circuit by a different means.

Hal

List of 57 messages in thread
TopicAuthorDate
inrush current + suitable voltage sour            01/01/70 00:00      
   Inrush current of lamp            01/01/70 00:00      
      Current inrush            01/01/70 00:00      
         NTC?            01/01/70 00:00      
            Soft-start            01/01/70 00:00      
               8 reed SW parallely + 21.12A / at 12VDC            01/01/70 00:00      
                  Car battery???            01/01/70 00:00      
                  inrush current            01/01/70 00:00      
                  totally irrelevant            01/01/70 00:00      
                  No testing needed, standardly            01/01/70 00:00      
                     replies            01/01/70 00:00      
                        Reply to "replies"            01/01/70 00:00      
                           the difference between "cheap" and "inex            01/01/70 00:00      
                           current limit resistor            01/01/70 00:00      
                              are you just grasping for straws?            01/01/70 00:00      
            NTC, yes            01/01/70 00:00      
               Filaments            01/01/70 00:00      
                  In the days of radios for AC and DC            01/01/70 00:00      
                     Thanks            01/01/70 00:00      
            resistor parallel to Switch!            01/01/70 00:00      
               MOSFET, constant current source?            01/01/70 00:00      
                  not for my use            01/01/70 00:00      
                     Ok, but...            01/01/70 00:00      
                        but i think            01/01/70 00:00      
                           Relays            01/01/70 00:00      
                              yes ofcourse            01/01/70 00:00      
                                 here we go again            01/01/70 00:00      
                                    Even more!!            01/01/70 00:00      
                                       werlcome to the club            01/01/70 00:00      
                                       reply            01/01/70 00:00      
                                          why did you not say so?            01/01/70 00:00      
                                          You made a fool of us!            01/01/70 00:00      
                                             reply            01/01/70 00:00      
                                                That's no fun!            01/01/70 00:00      
                                                   Suresh, I hope you had fun            01/01/70 00:00      
                                                   reply            01/01/70 00:00      
                                                      yeah 6 days later.            01/01/70 00:00      
                  Hello Kai,            01/01/70 00:00      
                     Look at here            01/01/70 00:00      
                        Thank you very much Kai.            01/01/70 00:00      
                           It just strikes me            01/01/70 00:00      
                              yes you are right            01/01/70 00:00      
                                 Reed switch problems            01/01/70 00:00      
                                    Current rating?            01/01/70 00:00      
                                       I recall long ago something about a "sti            01/01/70 00:00      
                                       Reed problem            01/01/70 00:00      
                                          Glueing together            01/01/70 00:00      
                                             Reed problems            01/01/70 00:00      
                                                reed relayrs            01/01/70 00:00      
                           power dissipation calculations?            01/01/70 00:00      
                              bulb voltage drop            01/01/70 00:00      
                                 Thanks            01/01/70 00:00      
                                 (.2*bulb resistance            01/01/70 00:00      
                                    The bulb            01/01/70 00:00      
                              Constant current during inrush moment            01/01/70 00:00      
                                 Thanks a lot Kai            01/01/70 00:00      
         Choke would be huge            01/01/70 00:00      

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