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From July 1999 to September 1999 I constructed and documented a frequency counter of the year 1999. I've taken a picture of this device: |
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You can connect a microphone to the front of the frequency counter. There is also a terminal at the rear part of the device, if you want to measure an electric signal. At first step this signal is connected to the little black box that is on the frequency counter. The circuit of the little box is a signal divider. Of course the output of signal devider is connected to the frequency counter. |
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Some data Frequency range: 1-39,999 Hz Peak value of input signal: 5 mV Input resistance of microphone terminal: 10 kohms Input resistance of rear terminal: 100 ohms Main supply: AC 230 V, 50 Hz, 33 VA |
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When you're fetching a video for the first time, there's some loading time and the screen is black. Video: Measuring 50 Hz 1 min., 23.1 MB Video: Measuring 440 Hz 30 s, 15.1 MB Video: Measuring 1 kHz 20 s, 9.0 MB My Device Story |