Here's what I've learned:
1.) The batteries are available - about 16 bucks each. You can use a 9V "transistor" battery and a couple of alligator jumper clips to test the protection circuit. Still haven't been able to find a schematic of how this works.
2.) Without batteries - these things will work.Assume that without batteries - the protection circuit is inoperative?
The way this protection circuit works is that if you beat 'em to near death - the red LED will come on and the speakers will shut down -no sound.Quit being stupid ( turn it DOWN) and press the button with the lightbulb with a slash thru it -speaker will come back on and red LED goes out.The button with a lightbulb on it is the protection test button -press it and the red LED lights and no sound. Press the button with the lightbulb with a slash thru it and the red LED goes out and the speakers will make sound again.This is not the same system used in the subsequent APOC equipped speakers.The protection system probably explains why so many of these early 801's are still making music.
3.) Fuse is a 5A -again what it's hooked up to a mystery to me -can't find documents/schematic on these first generation 801's yet?
4.) Strangest thing about these speakers so far is the static impedance of these things measures in the 13-14 MegOhm range in one direction and around 3.5 MegOhm in the other.In other words - put your meter across the input terminals of these speakers with nothing going on and instead of measuring something in the say 4 to 16 ohm range you get MegOhms ???Sure would like to see a schematic of these series 80 speakers!
1.) The batteries are available - about 16 bucks each. You can use a 9V "transistor" battery and a couple of alligator jumper clips to test the protection circuit. Still haven't been able to find a schematic of how this works.
2.) Without batteries - these things will work.Assume that without batteries - the protection circuit is inoperative?
The way this protection circuit works is that if you beat 'em to near death - the red LED will come on and the speakers will shut down -no sound.Quit being stupid ( turn it DOWN) and press the button with the lightbulb with a slash thru it -speaker will come back on and red LED goes out.The button with a lightbulb on it is the protection test button -press it and the red LED lights and no sound. Press the button with the lightbulb with a slash thru it and the red LED goes out and the speakers will make sound again.This is not the same system used in the subsequent APOC equipped speakers.The protection system probably explains why so many of these early 801's are still making music.
3.) Fuse is a 5A -again what it's hooked up to a mystery to me -can't find documents/schematic on these first generation 801's yet?
4.) Strangest thing about these speakers so far is the static impedance of these things measures in the 13-14 MegOhm range in one direction and around 3.5 MegOhm in the other.In other words - put your meter across the input terminals of these speakers with nothing going on and instead of measuring something in the say 4 to 16 ohm range you get MegOhms ???Sure would like to see a schematic of these series 80 speakers!