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Amplifier board debugging notes (view source)
Revision as of 16:21, 31 March 2010
, 16:21, 31 March 2010no edit summary
== Improper DC levels from voltage regulators ==
== Improper DC levels from voltage regulators ==
[[Image:AmpBoard_Vref.png|frame|Pinout of voltage regulators ([http://www.powerdi.com/datasheets/ZR431L.pdf ZR431L]) used on ampplifier board.]]
=== Description ===
=== Description ===
=== Cause ===
=== Cause ===
The pads for pins Gnd and Vz of the voltage regulators were reversed. The proper assignment of pins is shown in the adjacent figure.
The pads for pins Gnd and Vz of the voltage regulators were reversed. The proper assignment of pins is shown in the adjacent figure.
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==
== Wrong voltage on R<sub>C</sub>/R<sub>D</sub> junction ==
[[Image:AmpBoard_FETorient.png|frame|Quick fix for the package-footprint mismatch of the FET swtich]]
=== Description ===
=== Description ===
A voltage of 2.75 V was measured on the junction between R<sub>C</sub> and R<sub>D</sub> resistors, instead of 2.25
A voltage of 2.75 V was measured on the junction between R<sub>C</sub> and R<sub>D</sub> resistors, instead of 2.25