Posts Tagged ‘frequency counter’

Frequency Meter for 10 Hz to 100 kHz Input by 74121

This frequency meter is suitable for sinusoidal wave and square wave input signals. Minimum input potential must be 25mV(rms). Measurement range can be determined from 10 Hz to 100 kHz by using the S1 switch. Each switch position part is calibrated by using 20 kOhm potentiometer. Total current consumption of the circuit is about 10mA. R1 and C1 values should be chosen depending on wheather microampermeter or milliampermeter is used.

Read more source:http://www.circuit-projects.com/frequency-meter-for-10-hz-to-100-khz-input-by-74121.html
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Frequency Divider by 555 and 4040

U1 7555 is a CMOS version of 555 LM555 pdf datasheet.
The 555 here is in Astable Oscillator mode, C1 and C4 are decoupling capacitors 0.1uF value, ceramic disc.
The output is around 100kHz, If C3 is plastic or mica the frequency output will be stable with temperature. It is better to use a crystal oscillator.
The 555 output is fed to clock input of 4040, the output of 555 will be a square wave, on every high to low transition (falling edge or negative transition) the counter increments by one and the output is 12 bit binary.
If input frequency is F the final output at Q12 is F/4096. The period T = 1/F.
If you make the 555 run at 1Hz, C3 around 7uF, Then this circuit becomes a long duration timer, the Q12 period will be 4096 seconds or 68 minutes

Read More Source:http://schematics.blogspot.com/2004/11/frequency-divider.html
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40MHZ/400MHZ Frequency Counter by PIC16F84

Frequency counter is a very important test instrument for Radio Amateurs, especially those who wish to develop or test circuits. There are lots of frequency counters in the market but building one was never so easy & exciting with Microprocessors doing lots of work for us.

Read More Source:http://www.foxdelta.com/products/fc2.htm
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