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Jim Granville
03/24/12 19:42
Read: 607 times

#186872 - diode choices
Responding to: ???'s previous message
Cian Young said:
The solenoids are rated at according datasheet -

5V to 12VDC. Closed Power Continuous = 3 Watts.

Where would I position such a diode in the schematic and would a diode such as a rectifier diode suffice?
Totally overlooked this.


Yes, any generic 1N4007 family diode will do, 3 watts is well under 1A.

You place the diode directly across the Solenoid so it does not turn ON when the solenoid is ON, but does turn on when the relay opens, and the pin tries to fly negative.

This will have a slight impact on the release time of the solenoid, if those milliseconds matter, you can use a diode+power zener clamp.

List of 12 messages in thread
Interrupts, the 8052 & Solenoids      Cian Young      03/24/12 13:33      
   Freewheeel diodes      Per Westermark      03/24/12 15:00      
      ULN2003a      Cian Young      03/24/12 18:34      
         more than one inductive load here      Jim Granville      03/24/12 19:11      
            Solenoids      Cian Young      03/24/12 19:26      
               diode choices      Jim Granville      03/24/12 19:42      
         Diodes in ULN2003a      Michael Karas      03/25/12 08:21      
         Within this chip      Erik Malund      03/26/12 07:03      
            Do I hear...      Michael Karas      03/26/12 07:07      
   Irish keypad layout!!      Andy Neil      03/25/12 06:27      
   Lack of resistors.      Michael Karas      03/26/12 08:00      
      Success      Cian Young      03/28/12 11:00      

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