Hello, I thought I knew something about electronics until I didn't.
I have a super simple circuit, 555 astable multivibrator with the output going to the base of a NPN transistor (with a 1k base resistor) that energizes a 5v relay connected between the collector and 5v rail. Away from computer, but the schematic is just the basic 555 oscillator, with a momentary switch that attaches pin 1 to GND to start the oscillating.
The circuit works fine, but when applying 5v to the power rails, the 5v relay seems to activate, even though the 555 pin 1 is disconnected. I imagine there is a voltage present at the base of the transistor, but I do not know how to remedy it.
Any help would be appreciated, thanks.