Use a positive voltage regulator, For example 7812.
I need to control a simple relay with a push button; push on/push off. I found this circuit online which seems simple enough except it's for +6-19 VDC. I need to run it with 24-28VDC. It's been a very long time since my basic electronics and semi-conductors training in the Navy. What, if anything, do I need to do to this circuit to use %30 higher operating voltage? Assuming the coil in K1 is a 24 volt coil, can I just raise the value of R3 and R6 to say, 5.6 K or would I need to do more?
I see what you're saying about the relative versus absolute voltage. So if I do build it and run it as is with a 24-28V source, the circuit will work with a 24V relay coil that draws maybe 50ma?Just run it. The transistors can handle 40 volts and 1 amp. In this circuit, to switch the transistors, it's more about the relative voltages than absolute voltages. I think the numbers were originally for a 6 or 12 volt relay coil.
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