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| Thread ID: 39575 | 2003-11-11 01:45:00 | Off Topic: Would a line-level signal be enough to power 6 headphones? | somebody (208) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 190755 | 2003-11-11 01:45:00 | This is just another post semi-following up for my previous one. I've just realised that i've been powering 4 headphones off what I think is a line-level output (the left channel output from a professional mixer). What i'm wondering is if a line-level output from a simple preamp such as this: www.ee.washington.edu would be sufficient to power 6 headphones (connected in a parallel fashion). Any ideas? Note: I would plan to have all 6 mics (of the headsets) connected to the mic-in part of the preamp, also in a parallel fashion. |
somebody (208) | ||
| 190756 | 2003-11-11 02:55:00 | That circuit is a voltage amplifier ... designed to feed a reasonably high impedance, with virtually no current. (See how much current through the 2k2 it takes to drop your 7 volts to nothing.) :D I think you want a bit more than that. Have look at other circuits at that site ... you might find a small "power" amplifier ... perhaps with a BC327/BC328 pair. But by the time you have bought some veroboard, and the parts at single unit prices, you will probably find a kit amplifier cheaper. I don't want to discourage you from building from scratch --- but the price of parts is becoming a killer. Even with kits (which have all the parts) , it's often cheaper to but a factory built unit. Heathkit used to be great ... but by the 70s, they were suffering from the Asian manufactured stuff being cheaper than their kits. By the way, it's a bad idea to connect a lot of microphones in parallel ... it will be better to feed them into a "fan" of resistors to give a "splitter" |
Graham L (2) | ||
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