how high is high impedance
how high is high impedance
(OP)
Ignoramus is setting out to dabble in electronics. Comes up against a requirement that headphones (for a certain application) need to be "high impedance". Has no idea what constitutes high impedance. Can anyone help?





RE: how high is high impedance
This memory is from fifteen years ago, so it may be out of date for modern headphones.
RE: how high is high impedance
RE: how high is high impedance
BTW: What IS the application?
Gunnar Englund
www.gke.org
RE: how high is high impedance
RE: how high is high impedance
The 2000 ohms was probably chosen A) because that was about as high as you could get with a reasonable amount of wire and B) because that happend to be a good impedance match. I think(?).
I have seen some lab note books from that time. Those guys did it down to the fourth decimal. Without little calculators or computers. So I do not think that the impedance was chosen haphazardly.
Gunnar Englund
www.gke.org
RE: how high is high impedance
just in case it makes any difference to advice, the exact application is this. I have built (from kit) a small circuit to learn about/develop microcontrollers. outputs are flashing LEDs, LCD display("hello world") and high impedance headset.
RE: how high is high impedance
Gunnar Englund
www.gke.org
RE: how high is high impedance
If the kit uses any sort of amp output, this would most likely represent a low impedance and the use of anything about 100 ohms would be appropriate as Skogsgurra suggests.