09-11-2013, 03:59 AM
That puts DC into the voice coil and biases the cone.
I tried it with a transistor when I was a teenager and got sound that was quite good.
The main problem was that the speaker coil got hot to the point that the magnet also got quite warm.
I learned why car radios of the time ran the speaker from an auto transformer arrangement with a PNP transistor and the speaker from the tap to the negative earth. The transformer was in the collector load.
I tried it with a transistor when I was a teenager and got sound that was quite good.
The main problem was that the speaker coil got hot to the point that the magnet also got quite warm.
I learned why car radios of the time ran the speaker from an auto transformer arrangement with a PNP transistor and the speaker from the tap to the negative earth. The transformer was in the collector load.
