The circuit in this Design Idea makes a voltmeter that reads to 0.99V. The idea uses a counter IC to drive two sets of four LEDs (Figure 1). Each of these two sets represents a BCD ...
My workbench includes a Hewlett-Packard 8405A VVM (vector voltmeter) of 1960s vintage. The VVM can convert two inputs at frequencies of 1 MHz to 1 GHz to outputs of 20 kHz, complete with modulation ...
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