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Electronics Forum / Electronics / July 2008amplify audio signal from computer to higher voltage and current tia sal2
I’m looking for away to amplify the audio signal coming from my computer sound cards output. I’m trying to amplify the output voltage to 31 volts and the output current to 1.5mA can someone recommend a small amplifier to do the job or a circuit that will do this for me. I'm just trying to do some testing. tia sal2 I think you went wrong on the proportions. you probably mean 31 KVolts and 1.5µA. you can test it quite comfortably on your tits. > I think you went wrong on the proportions. you probably mean 31 KVolts > and 1.5µA. you can test it quite comfortably on your tits. That made me laugh hahahhaha becareful you don't want to singe your nips ;-) no the specification are correct output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62 Volts Peak-Peak). and Output Current at : 1.0to 1.5 milliamps >> I think you went wrong on the proportions. you probably mean 31 KVolts >> and 1.5µA. you can test it quite comfortably on your tits. [quoted text clipped - 4 lines] >Peak-Peak). and >Output Current at : 1.0to 1.5 milliamps With those requirements I would suggest to connect a simple mains transformer, as found in many wall wards, in reverse to the speaker output of your soundcard. (You will need the old fashioned, 'heavy' type, not a modern light weight switcher type for that.) Open it to get access to the bare transformer inside (you don't need the rectifiers and capacitors). Connect the low voltage wires to your sound card. Use the 'mains' wires as output. Simply set the 'volume control' on your PC such, that you get some 31 volt for output.  SignatureKind regards, Gerard Bok > output voltage 27 Volts to 31 Volts (from 54 Volts Peak-Peak, to 62 Volts > Peak-Peak). and > Output Current at : 1.0to 1.5 milliamps The output transformer is a good idea since the maximum power is just 46.5mW for a square wave signal, the problem is what frequency range do you want handle on that output? Tranformers have different bandwidths due to their construction characteristics. If the signal you want to handle with it is a complex wave (not a simple sinusoidal one), computing the high frequency limit of the transformer's bandwidth consider the signal's harmonics too. Massimo I had no idea that 1.5mA would be a peak value. in that case I would suggest to increase voltage to 62 Kvolts and decrease current to 0.75 µA, which is also closer to safe standard values as used by other electrical LMRs. LMR = large mammel restraint >Im looking for away to amplify the audio signal coming from my >computer sound cards output. [quoted text clipped - 5 lines] > >tia sal2 A small audio amp, maybe even the one in your computer's speakers, with one speaker replaced by a "70 volt" audio transformer, connected backwards, to serve as a step-up transformer. >Im looking for away to amplify the audio signal coming from my >computer sound cards output. [quoted text clipped - 3 lines] > >I'm just trying to do some testing. --- 31 volts * 1.5mA is 46.5 milliwatts, so if your sound card puts out more than that just connect a transformer to it with the turns ratio selected to give the output voltage you want into the load. JF > >Im looking for away to amplify the audio signal coming from my > >computer sound cards output. [quoted text clipped - 8 lines] > more than that just connect a transformer to it with the turns ratio > selected to give the output voltage you want into the load. That would be a simple solution but try finding such a transformer these days. Graham >> >Im looking for away to amplify the audio signal coming from my >> >computer sound cards output. [quoted text clipped - 11 lines] >That would be a simple solution but try finding such a transformer these >days. --- Wind it. JF > >> >Im looking for away to amplify the audio signal coming from my > >> >computer sound cards output. [quoted text clipped - 14 lines] > --- > Wind it. I've been known to but damn do my fingers hurt afterwards (no machine you see). Grahama |
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