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???
08/01/03 13:59
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 		 #51919 - RE: High Voltage to TTL conversion prob.
Responding to: ???'s previous message
Hi John
The way to do it is put a small capacitor in series with the 115VAC then a rectifier diode and electrolytic capacitor with a load resistor to convert mains into small DC voltage which drives the LED of the optocoupler through a current limiting resistor.
For transformerless power supply check the following link http://www.microchip.com/download/...91008b.pdf
Regards
Mahmood

List of 48 messages in thread
TopicAuthorDate
High Voltage to TTL conversion prob.            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
      RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
   Inductive KICK problem ..            01/01/70 00:00      
      RE: Inductive KICK problem ..            01/01/70 00:00      
         RE: Inductive KICK problem ..            01/01/70 00:00      
            RE: Inductive KICK problem ..            01/01/70 00:00      
            RE: Inductive KICK problem ..            01/01/70 00:00      
               RE: Inductive KICK problem ..            01/01/70 00:00      
                  RE: Inductive KICK problem ..            01/01/70 00:00      
                  RE: Inductive KICK problem ..            01/01/70 00:00      
                     RE: Inductive KICK problem ..            01/01/70 00:00      
                  RE: Inductive KICK problem ..            01/01/70 00:00      
                     RE: Inductive KICK problem ..            01/01/70 00:00      
                     RE: Inductive KICK problem ..            01/01/70 00:00      
                        RE: Inductive KICK problem ..            01/01/70 00:00      
                        Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                           RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                              RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                                 RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                              RE: Resistance ...........Kai            01/01/70 00:00      
                              RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                                 RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                                    RE: Resistance 100 ohm or 1000 ohm please ..            01/01/70 00:00      
                                       RE: Resistance 100 ohm or 1000 ohm pleas            01/01/70 00:00      
                                          RE: Resistance 100 ohm or 1000 ohm pleas            01/01/70 00:00      
                                             RE: Practical point of view            01/01/70 00:00      
                                                RE: Practical point of view            01/01/70 00:00      
                                                   ESD calculation            01/01/70 00:00      
                                                      RE: ESD calculation            01/01/70 00:00      
                                                         Sorry to Lee Cross!            01/01/70 00:00      
                                                         RE: Mike and Kai            01/01/70 00:00      
                                                            RE: Mike and Kai            01/01/70 00:00      
                                                               RE: Mike and Kai            01/01/70 00:00      
                                                                  RE: Mike and Kai            01/01/70 00:00      
                                                                     RE: Mike and Kai            01/01/70 00:00      
                                                                     RE: Mike and Kai            01/01/70 00:00      
                                                                        RE: Mike and Kai            01/01/70 00:00      
                                                                  RE: Mike and Kai            01/01/70 00:00      
                                                                     RE: Mike and Kai            01/01/70 00:00      
                                                                        RE: Mike and Kai            01/01/70 00:00      
   RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
      RE: High Voltage to TTL conversion prob.            01/01/70 00:00      
         RE: High Voltage to TTL conversion prob.            01/01/70 00:00      

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