Re: Tek 547 A Sweep display during retrace
Dave Wise
I hope someone can try it out. I'm out of town right now.
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Dave Wise
On Nov 9, 2017, at 2:05 PM, David davidwhess@gmail.com<mailto:davidwhess@gmail.com> [TekScopes] <TekScopes@yahoogroups.com<mailto:TekScopes@yahoogroups.com>> wrote:
The 2N5401 might still be fast enough. I suggested it and the BC556 because they are relatively common. The KSA992 is the best of the commonly available and inexpensive options that I found. I was not able to find any detailed specifications on the original 2N2207 to make a better comparison between it and modern parts. The low voltage output capacitance is a start but not sufficient. On Thu, 9 Nov 2017 19:48:38 +0000, you wrote: I think KSA992 is a better bet with 3pf max. Dave Wise On Nov 9, 2017, at 11:15 AM, David Wise david_wise@phoenix.com<mailto:david_wise@phoenix.com><mailto:david_wise@phoenix.com> [TekScopes] <TekScopes@yahoogroups.com<mailto:TekScopes@yahoogroups.com><mailto:TekScopes@yahoogroups.com>> wrote: 2N5401 is 6pf vs 2.3 . It will be much slower in this application. ------------------------------------ Posted by: David <davidwhess@gmail.com<mailto:davidwhess@gmail.com>> ------------------------------------ ------------------------------------ Yahoo Groups Links
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