mark electro Posted December 22, 2007 Share Posted December 22, 2007 Hi Guys and Gals, I have yet another Question. I have recently recieved a Pre-amp for my sterio. The pre-amp OUTPUT impedence is 600 ohms. My amplifier INPUT impedence is 47K ohms. My question is: Are these components compatable on this spec, (seems to be a huge difference); or is this a problem waiting to happen? I have to run and eat dinner but I will be back on in about 1.5 hours. Any help would be greatly appreciated. Thanx Mark Quote Link to comment Share on other sites More sharing options...
mark electro Posted December 22, 2007 Author Share Posted December 22, 2007 Hi Guys and Gals, I have yet another Question. I have recently recieved a Pre-amp for my sterio. The pre-amp OUTPUT impedence is 600 ohms. My amplifier INPUT impedence is 47K ohms. My question is: Are these components compatable on this spec, (seems to be a huge difference); or is this a problem waiting to happen? I have to run and eat dinner but I will be back on in about 1.5 hours. Any help would be greatly appreciated. Thanx Mark O.K> I'm back from dinner- can anyone answer this Question? Thanx Mark Quote Link to comment Share on other sites More sharing options...
mark electro Posted December 22, 2007 Author Share Posted December 22, 2007 THANK YOU......I will turn up the volume right now! Mark Quote Link to comment Share on other sites More sharing options...
WMcD Posted December 22, 2007 Share Posted December 22, 2007 These figures are actually design goals. In this interface, we are not interested in power transfer at all. We are only trying to get a voltage transferred. Or just make sure the voltage at the output of the pre-amp is recreated at the input of the power amp. The very high impedance at the input to the amp means that very little little current flows. Therefore it does not load the output of the pre-amp. Also, there is no voltage drop in the feed wire. The relatively low output of the pre-amp means that it can deliver current, even if a little compared to power amps. This current can be used to charge and discharge the very small inductance and capacitance in the feed wire. You may have seen that long leads can be used. I've seen 16 feet used as a rule of thumb in the old days. The amp should be able to charge up and discharge this length. Also, the pre-amp can drive multiple power amps or the like. BTW, the term capacitance was originally used as a term for capacity, meaning how much there is to fill up. It may have been applied the Leyden jars. Gil Quote Link to comment Share on other sites More sharing options...
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