First of all, happy new year, everyone. It's been awhile since my posts. And i admit that they(my posts) are unconvincing and childish. At this 2014, i'll get things more serious. I want to build an amp, but this amp requires negative input impedance at the base of the input transistor. I want to get this amp working, but i have no idea how to build a preamp with negative output impedance. Help?
What sort of amp requires negative impedance from the preamp?
You can achieve negative output impedance from an amplifier by applying a little bit of positive current feedback. There's an article on ESP about how to change output impedance. It's written with power amplifiers in mind, but the same principles apply to line-level amplifiers too.
You can achieve negative output impedance from an amplifier by applying a little bit of positive current feedback. There's an article on ESP about how to change output impedance. It's written with power amplifiers in mind, but the same principles apply to line-level amplifiers too.
@Mr. Evil, Thanks for the info. Sorry for a bit late reply. BTW, the amp which I want to build is a differential tringlotron with npn-based tringlotron at one side and pnp-based tringlotron at the other side. I can handle the pnp side input, as its input impedance is positive, while the npn side requires negative input impedance. I think this amp will be worth to listen, until this problem solved, of course.
- Status
- Not open for further replies.