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Next, the signal is buffered by a PNP emitter-follower biased at around 5mA collector current. | Next, the signal is buffered by a PNP emitter-follower biased at around 5mA collector current. | ||
That provides a known (low) source impedance for driving the switch-selectable LF reject and HF reject filters. | That provides a known (low) source impedance for driving the switch-selectable LF reject and HF reject filters. | ||
The output of the filters drives a discrete NPN differential amplifier, which drives U165, a [[ | The output of the filters drives a discrete NPN differential amplifier, which drives U165, a [[155-0109-01]] Tek-made trigger IC. | ||
==Specifications== | ==Specifications== | ||