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Audio frequency counter using AT89C52 micro controller
https://www.engineersgarage.com/audio-frequency-counter-using-at89c52-micro-controller/
So to measure such all kind of audible sound – audio frequency it is required to have audio frequency counter that displays frequency of audio signal or audio tone. The project presented here counts the audio frequency and displays on LCD screen. It uses micro controller AT89C52 that counts frequency of applied input signal and displays it on 16×2 LCD screen.
Sound Frequency Meter Circuit - ElectroSchematics.com
https://www.electroschematics.com/sound-frequency-meter-circuit/
The output of IC1 is directly connected to the counter IC1a which divides the signal by 2 and the following three counters divide by 10. In any of the measurement range with this frequency meter, 50 Hz is the point where the meter will have full deflection. The signal from S2 is used to trigger the monostable multivibrator.
2 Simple Frequency Counter Circuits - Homemade Circuit ...
https://www.homemade-circuits.com/how-to-make-simple-frequency-counter/
1) Frequency Counter Using IC 74LS47. The first circuit can be understood with the following points: 1. The IC 555 is configured in an astable mutivibrator mode (AMV). 2. AMV is a configuration in which the IC555 generates alternate high and low pulses at its pin number 3. 3.
Audio Frequency Counter - Apps on Google Play
https://play.google.com/store/apps/details?id=com.keuwl.audiofrequencycounter&hl=en_US&gl=US
This app can provide more accurate frequency measurement for single frequency input signals. Features include: Display of triggered event count and frequency or time period. Gate time of 0.1s, 1s, 10s or 100s. Gain from x1 to x1000. Trigger on rise or fall. AC or DC coupling.
The ICM 7216 — A Frequency Counter on a Chip
https://www.eeweb.com/the-icm-7216-a-frequency-counter-on-a-chip/
The basic circuit for an ICM7216B counter is illustrated below: In addition to this IC, you need eight 7-segment displays, a crystal, and a collection of diodes, resistors, capacitors, and switches. You can select from a 1 MHz or 10 MHz crystal, or use an external oscillator if you have a TCXO, OCXO, rubidium, or GPS-derived clock handy.
5 Digit Frequency Counter Circuit - Homemade Circuit …
https://www.homemade-circuits.com/5-digit-frequency-counter-circuit/
Figure 1 exhibits the circuit diagram of the 10-MHz digital Frequency Counter. The circuit includes an ICM7208 seven-decade counter (U1), an ICM7207A oscillator controller (U2), and a CA3130 biFET op amp (U3). IC U1 is used for counting the input signals, and then decode them to 7-segment structure. It additionally is used for generating the output signals for driving …
100MHz frequency counter with PIC16F628A - LCD Display ...
https://www.electronics-lab.com/project/100mhz-frequency-counter-with-pic16f628a-2/
The most important part for the accuracy of the frequency counter is the time base setting circuit – crystal resonator X1 and capacitors C4 and C5. C4 and C5 values can be between 33pF and 62pF and the crystal frequency can be fine tuned with them. The input of the schematic is feed through a high speed comparator.
A SIMPLE FREQUENCY METER
https://www.qsl.net/pa2ohh/11freqcnt1.htm
With S1 in the lower position, the RF signal goes to the input of the 74HC4060. This IC divides the RF signal by 4096 to an audio frequency. At the output of the 74HC4060, you can find the RC network of 10k ohm and 10nF to reduce the slope. And the resistor network of 22k and 1k does attenuate the audio level so that the soundcard is not overdriven.
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