[time-nuts] COMPLETELY off topic - but I know you'll read itanyway.

Steve Rooke sar10538 at gmail.com
Sun Oct 12 00:11:42 UTC 2008


2008/10/12 Don Johnson <True-Cal at swbell.net>:
>>"The A channel handles the positive voltage and the B channel becomes the
>>negative, thus doubling the output voltage swing."
>
> This is a very odd way to state what's happening in the bridged mode. You gatta love manuals written by the marketing department. Not totally wrong but only accurate during complex instances in time when the positive half of the output is indeed handled by ch-A and the negative by ch-B. In another instance however, this will be reversed. A more accurate description is what someone else has already stated as a push-pull arrangement of the out-of-phase driven channels. The bridge mode switch couples one of the input channels to both output stages but also inserts an additional op-amp stage (phase inverter) in only one of the channels. Now as the input signal goes positive, the "hot" terminal of ch-A will be driven positive while the "hot" terminal of ch-B will be driven negative equally. All this reverses as the input signal goes negative.

It should be called differential output.

73
Steve
-- 
Steve Rooke - ZL3TUV & G8KVD
Omnium finis imminet



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