I need help with a high side switch circuit (actually two a left and right) to switch a 2.5-3A incandescent lamp, it needs two inputs per circuit with XOR logic.
12-15V supply, rugged yet simple, open load tolerant.
What I am doing is I have a single filament stop/turn signal lamp that I need it to illuminate with the brake light switch (input 1) and to flash with a turn signal input (input2) whether or not the brake signal is present, I understand the light would invert flash with the other turn signal lamp when the brake is applied but that is OK.
The turn signal switch I have is not sophisticated enough to automatically isolate the turn signals and brake signals unlike most automotive turn signal switches.
I was thinking a simple TIP120 switch with a XOR TTL chip driving it but I suspect the TTL level is not enough to drive the TIP120 directly?
It has been decades since I have tried to design a circuit like this.
It would be built on proto board and potted.
Thanks
12-15V supply, rugged yet simple, open load tolerant.
What I am doing is I have a single filament stop/turn signal lamp that I need it to illuminate with the brake light switch (input 1) and to flash with a turn signal input (input2) whether or not the brake signal is present, I understand the light would invert flash with the other turn signal lamp when the brake is applied but that is OK.
The turn signal switch I have is not sophisticated enough to automatically isolate the turn signals and brake signals unlike most automotive turn signal switches.
I was thinking a simple TIP120 switch with a XOR TTL chip driving it but I suspect the TTL level is not enough to drive the TIP120 directly?
It has been decades since I have tried to design a circuit like this.
It would be built on proto board and potted.
Thanks