Hi There,
I have a circuit based around 555 astables, and I want to couple the output to the line input of some inexpensive PC speakers. The 555 circuit and the speakers share a 12VDC wallwart supply.
Is it all good to simply attenuate my signal to a safe level, or do I need to capacitively couple it or perform some other trickery to make the signal swing negative? In other words: one lead is grounded, the other varies between 0V and +0.3V, will this signal drive the speakers properly?
I can recall some of the implications of I=dV/dt and I'm afraid a capacitor might mangle my squarewaves, and also a little suspicious that I could accidentally bias the speakers into overheating or something. It's been a while since I melted any solder.
Thanks guys,
Adam