Hi here is the basic question,
I am trying to drive a 12v load from 5v input.
Both 12v and 5v are complete different individual sources.
When the ground of 5v is connected to PNP base i need to drive +12v supply to my load.
I already tried using BC558 to drive 12v relay.
1. Base - 0v(Ground of 5v source) - 10k
2. Emitter - +12v - No resistor
3. Collector - +ive terminal of 12v relay (-ve permonently connected to ground)
Output - Nothing happens.
But it turned ON relay only when i connected +5v supply along with +12v supply(Emitter).
I dont want to mix both the sources since it may affect my 5v system(uc).
Can someone suggest me how to achieve this??
I am trying to drive a 12v load from 5v input.
Both 12v and 5v are complete different individual sources.
When the ground of 5v is connected to PNP base i need to drive +12v supply to my load.
I already tried using BC558 to drive 12v relay.
1. Base - 0v(Ground of 5v source) - 10k
2. Emitter - +12v - No resistor
3. Collector - +ive terminal of 12v relay (-ve permonently connected to ground)
Output - Nothing happens.
But it turned ON relay only when i connected +5v supply along with +12v supply(Emitter).
I dont want to mix both the sources since it may affect my 5v system(uc).
Can someone suggest me how to achieve this??