Hi, everybody! Everything's ok?
So, with a 12 V battery, I need to suply at least 11 V to an electromagnet, like image 1. My problem is: I need an on-off switch to control the state of this electromagnet. This circuit is set on a drone, so it needs to be controlled via the APM controller. The APM can send a 5 V signal to the switch, making the circuit look like image 2. The eletromagnet consumes 250 mA. First thing i've tried, was using 3 parallel PNP transistors with maximum Ic current equal to 100 mA. When I set the circuit on, it burned (maybe the base resistance were too small?). The circuit is in image 3. My questions are:
1) What is the best switch I can use? (SCR, diode conection, zenner, etc..)
2) Should I use a NPN?
3) If I keep using PNP, how can I define it resistances?
If anyone have another hint, please tell me.
Thanks already, Eduardo.
image 1
image 2 image 3
So, with a 12 V battery, I need to suply at least 11 V to an electromagnet, like image 1. My problem is: I need an on-off switch to control the state of this electromagnet. This circuit is set on a drone, so it needs to be controlled via the APM controller. The APM can send a 5 V signal to the switch, making the circuit look like image 2. The eletromagnet consumes 250 mA. First thing i've tried, was using 3 parallel PNP transistors with maximum Ic current equal to 100 mA. When I set the circuit on, it burned (maybe the base resistance were too small?). The circuit is in image 3. My questions are:
1) What is the best switch I can use? (SCR, diode conection, zenner, etc..)
2) Should I use a NPN?
3) If I keep using PNP, how can I define it resistances?
If anyone have another hint, please tell me.
Thanks already, Eduardo.
image 1
image 2 image 3