|Subject:||Re: [TenTec] Century 670 keyer manual / help|
|From:||Bwana Bob <firstname.lastname@example.org>|
|Date:||Sun, 28 Nov 2004 22:16:08 -0500|
I have a paper copy of the 670 data sheets. I can make a photocopy and mail it to you or I could scan it.
If power and output were interchanged, it may only blow Q4, the output transistor, a type MPS 6514. Probably any general purpose NPN transistor will work as a substitute. The output is an open collector NPN transistor, so it will not key negative voltages (i.e.: grid block keying) or high positive voltage (cathode keying).
Floyd Rodgers wrote:
Anyone have one in pdf or scan form? Otherwise, plain old copy will get converted to PDF, once I have it. Basic problem is what dies when the power and output leads get reversed? Thanks
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