[ Post a Follow-up ][ New Thread ]

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!

This message has been here for a period of time, a follow-up seems unnecessary. In this place we have stopped the functions of [post a follow-up]. To discuss and communicate your ideas/info, you may use our new message boards, please go to: Electrical and Electronic Community

When you do want to contact the author of this message, you must replace the "(at)" with "@" and "(dot)" with "." in his/her e-mail address above. But, please do not spam...

To create a new thread, please go to the current board of discussion forums. On that page, click the [Post a Message] or [New Thread] link, then you will find the submit form.

There are more than 55 boards in our site. Please choose, according to your topics, an appropriate one to post your message. If you are new comers, we suggest you to go to our Homepage to have a clear knowledge of the subjects and the orientations of our site before you post any messages.