Build your own bypass-capacitor tester

Posted on Jul 29, 2012

The circuit in Figure 1 tests these characteristics. It charges the capacitor under test through 100 k for approximately 1 msec and then discharges it through 10 for approximately 40 nsec. The cycle then repeats. The circuit uses a double-sided copper-clad pc board. All the components except the 10 resistor connect to one side of the board, so they can benefit from shielding by the cast-aluminum enclosure (Figure 2).

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