10510Re: [loopantennas] Trask Amplifier for Wideband Active Loop Amp - mod suggestions?
- Feb 21, 2014
>I never did go to the trouble of determining if hfe imbslance affected the performance, and it's less important for common base amplifiers than it is for common emitter. But, my feeling is that a match of 5% or less would be prudent.
>Well, my bulk buy of BC549C's has arrived, so one more question before I get started on the amplifier...
>How closely do I need to match the transistor pairs? Can I just go by HFE reading on my cheap digital multimeter, or for best results do I need to break out something a bit more serious? If so, what exactly? :)
>Can I just use my 8405A and check that there's exactly 180 deg phase and equal amplitude on each side?
N7ZWY / WDX3HLB
Senior Member IEEE
- << Previous post in topic Next post in topic >>