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M753: Difference between revisions
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Relays select which attenuator is attached to an input line, but only one attenuator at a time is actually connected to the input line. | Relays select which attenuator is attached to an input line, but only one attenuator at a time is actually connected to the input line. | ||
The amplifier and a relay select which attenuator the output signal comes from. | The amplifier and a relay select which attenuator the output signal comes from. | ||
This was not practical until integrated JFETs became available. | This was not practical until integrated JFETs became available. See the "New Attenuator Scheme" figure. | ||
There are several advantages inherent in this scheme. | There are several advantages inherent in this scheme. | ||
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<gallery> | <gallery> | ||
1990-08-23 New Attenuator scheme m753.jpg | 1990-08-23 New Attenuator scheme m753.jpg|New Attenuator Scheme | ||
1990-10-12 M753A Ckt Description for Eng p1.jpg | 1990-10-12 M753A Ckt Description for Eng p1.jpg | ||
1990-10-12 M753A Ckt Description for Eng p2.jpg | 1990-10-12 M753A Ckt Description for Eng p2.jpg | ||