In your circuit, you have 40mA Base current into Q2, which is switching a load current of only 85mA, you have an assumed saturation Gain in Q2 of 2.??
In Q1 Base you have 0.22mA, with a collector current of 40mA, an assumed saturation Gain of 200.??
If you check the voltage on Q1 collector you will see it is 5.5Volts, its not saturated and it dissipates 0.22Watts when its ON.
Its a good rule to assume a saturation gain of ~10 to 15.
Where will you find 130R, 1k3, 19.1k and 191k resistors.???
hi E...
Sorry for the delay in responding...i've been sick...:-|
Wow...I was way off...
The resistor values I just left in from the simulator...I was planning to change them later...
I havent used LTspice much so I'm still becomming familiar with it..
Thanks for your review and clarification.
Couple of questions...
1. The relay coil needs to change to 100 ohm, 120 ma. I think the values you supplied are ok. Any adjustments?
2. I need a latching relay driver with a n.o. push button connected to +5. It should toggle the relay on/off with each push of the button. Can you check this circuit for me please?