dbbaker2007
Newbie level 2
I am having difficulty driving dual coil relays. I have tried several techniques with no consistent switch. I had a switch working with just a simple PNP BJT, resistor, and diodes but the BJT's were dying out after switching. The other problem I seem to be having is that the voltage of the output of the switch is normal until the relay is connected and then there is s significant drop in voltage. The relays I am using are K850 6Vdc 60A.
I am using my microcontroller as the logic source. When a pushbutton is pressed the micro reads it and outputs a value. The relay requires at least a 50msec positive pulse on the open contact in order to open the relay or at least a 50msec positive pulse on the closed contact in order to close the contact.
I have searched high and low with no luck on finding a switching circuit that will work for a dual coil relay. There just seems to be too much current draw and too much of a voltage drop when applying voltage to the relay. If anyone has something working or any ideas that would be great.
Thanks
I am using my microcontroller as the logic source. When a pushbutton is pressed the micro reads it and outputs a value. The relay requires at least a 50msec positive pulse on the open contact in order to open the relay or at least a 50msec positive pulse on the closed contact in order to close the contact.
I have searched high and low with no luck on finding a switching circuit that will work for a dual coil relay. There just seems to be too much current draw and too much of a voltage drop when applying voltage to the relay. If anyone has something working or any ideas that would be great.
Thanks