Download video: 555 timer class D amplifier and tape recorder experiments
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in this video I use my 555-based pulse generator as a class D amplifier, a schematic is included near the end of the video, the quality is surprisingly good and clean, but the chip becomes unstable if I connect a speaker directly to the chip's output.
I also experiment with attempting to record onto tape with it connected up to the head in an el-cheapo tape transport that came out of a toy. Again the quality is better than I thought it would be, a little distorted but much better than a recording with no bias.