Hi All
Sorry I have re enlisted the help of this thread again. I bet everyone thought this had been put to bed. However, having built the circuit and added it to my existing circuit, I am still having problems due to the load sinking the "switch circuit" when it is supposed to be off. The sad thing is the device works brilliantly and powers up and down without fail. I've tested it all week and no fires or odd smells! But I have a 0.15 milliamp power flow from the battery when the unit is powered down and I have traced that to a pin on the load PCB that I do need to keep (the pin that is)!
So, I am going back to the drawing board (all was not lost as I leaned a lot about PNP, NPN transistors and FETS.) and I am going to make use of Hippies suggestion of using a relay.
I have built the circuit shown here and it works! Please can someone tell me if there are any "pitfalls" to using a circuit like this and since my load is a brushless motor controller, what should I use and where should I put it to prevent any reverse spikes from the motor damaging my "picaxe- relay" circuit.
(Id like to use a picaxe as I want to integrate "auto off" )
Thanks
JPU
Sorry I have re enlisted the help of this thread again. I bet everyone thought this had been put to bed. However, having built the circuit and added it to my existing circuit, I am still having problems due to the load sinking the "switch circuit" when it is supposed to be off. The sad thing is the device works brilliantly and powers up and down without fail. I've tested it all week and no fires or odd smells! But I have a 0.15 milliamp power flow from the battery when the unit is powered down and I have traced that to a pin on the load PCB that I do need to keep (the pin that is)!
So, I am going back to the drawing board (all was not lost as I leaned a lot about PNP, NPN transistors and FETS.) and I am going to make use of Hippies suggestion of using a relay.
I have built the circuit shown here and it works! Please can someone tell me if there are any "pitfalls" to using a circuit like this and since my load is a brushless motor controller, what should I use and where should I put it to prevent any reverse spikes from the motor damaging my "picaxe- relay" circuit.
(Id like to use a picaxe as I want to integrate "auto off" )
Thanks
JPU