Component_sorter_of_resistors_capacitors_and_zeners

Published:2009/7/19 20:40:00 Author:Jessie | From:SeekIC

Component sorter of resistors, capacitors, and zeners. Trace A is a 1 kHz square-wave clock that is applied to Q1. The component under test (CUT) in this case is a 0.01 μF capacitor. It is allowed to charge until the clock goes high, turning of the current source (trace B). The voltage the capacitor sits at is inversely proportional to its absolute value. The AD506 follows this potential and feeds the sample-and-hold circuit Q4-C2-A2. The sample-and-hold circuit is enabled by one-shot A for 200 μs when the clock goes high (trace C). After this time one-shot A goes low triggering one-shot B on for 100 μs. This pulse drives Q3 on (trace D) and discharges the CUT. This same fixture can check resistors and zeners by closing S1. This allows the current source to run all of the time. This is necessary since resistors and zeners have no memory (courtesy Analog Devices, Inc.).



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