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7104: Difference between revisions
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The 7104's amplifiers use a then novel scheme of "feed-beside" compensation ([http://www.google.com/patents/US4132958 US Pat. 4.132.958]) where instead of matching the HF response to the LF response, the LF response is determined by off-the-shelf operational amplifiers in parallel to the high-speed amplifiers, with a number of adjustable R-C time constants to compensate for thermal and other LF effects. The same technique is employed in the [[7A29]] amplifier plug-in. | The 7104's amplifiers use a then novel scheme of "feed-beside" compensation ([http://www.google.com/patents/US4132958 US Pat. 4.132.958]) where instead of matching the HF response to the LF response, the LF response is determined by off-the-shelf operational amplifiers in parallel to the high-speed amplifiers, with a number of adjustable R-C time constants to compensate for thermal and other LF effects. The same technique is employed in the [[7A29]] amplifier plug-in. | ||
==Power Supply== | |||
The 7104 uses a switch-mode power supply. | |||
Module A23 (schematic page <14>) contains the mains rectifier, base drive circuitry, and power transistors of the inverter (aka, switcher). | |||
These transistors produce a 25 kHz waveform that is fed to the primary of T1310, whose secondaries provide the power for the rest of the scope. | |||
Module A24 (also on schematic page <14>) contains the inverter control circuit and rectifiers for the secondaries of T1310. | |||
The inverter control circuit uses the [[155-0067-02]] inverter control IC, which is U1275. | |||
==Prices== | ==Prices== | ||