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Subject: Transconductance amplifier/constant current source audio amplifier

Date: 08/24/99
Posted by: Ola Haakon Berger
E-mail: o(dot)h(dot)berger(at)bigfoot(dot)com(no spam)
URL: http://www.cee.hw.ac.uk/~ceeohb/


I am designing a (electro dynamic) loudspeaker motor unit which I will use with a current source. The problem is that I have to build a source... i.e. a transconductance amplifier. My first concern is the concept behind delivering current to a load that varies typically between 4 and 32 ohms (fictive numbers) from DC up to way beyond 20kHz. The output current have to be proportional to the input voltage no matter what the impedance is. I am used to voltage amplification. Thinking current amplification feels strange and I do NOT have things under control. My first reaction was to combine the collectors of bipolar transistors in various ways. The task was, however, more difficult than I at first thought. Has anybody actually ever made a working transconductance amplifier with bipolar transistor technology? Guidance is appreciated!

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