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Low-frequency counter

Low-frequency counter
A frequency counter is indispensable in the design, repair and test of audio and hi-fi equipment. The counter presented here can either be built into a sine wave or function generator or, by the addition of a preamplifier, powersupply and a suitable enclosure, be made into a stand-alone unit. Its display has only four digits, since three or four of the usual seven or eight display digits are not used in audio work. Three switched measuring ranges are provided: 0-100 Hz; 0-10 kHz; and 0-100 kHz.
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