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Originally Posted by Don Rotolo
...Then, just connect a (5?) volt power supply between one of the amp outputs and "ground", and you have your 5 volt bias. Fiddle with the numbers (you'll probably want a 10 to 12 volt bias, really) and drop the electrodes into the water.
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Don,
This is not generally a good idea with modern audio amp design. The DC on the output that does not appear as part of the input signal will cause the amp to go unstable as the error correction circuitry tries to fight what it sees as an illegal output. This could have disasterous results for the power amp. The DC may also upset the damping/feedback control causing the amp to oscillate, sometimes enough to cause localized interference.
As to the notion that hydrogen is relatively safe, I think this can be attributed to the hydrogen cell research that has been publicized for the last few years. In this technology, the gas it locked up in a matrix that releases the gas in a very slow, low pressure stream useful for engines but slow enough to be non combustable under normal circumstances. I saw a demo where the container was shot with an incendary bullet and did light but did not explode. Hydrogen without precautions is explosive in a confined space.