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Driving consoles to increase the cut-off frequency
frequency up to 250 MHz

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The device has an input amplifier and signal generator. The sensitivity is very high, and reaches 50 mV at a frequency of 250 MHz. Very low power consumption!

Driving consoles to increase the frequency of the boundary frequencies up to 250 MHz.

Fig.1

Resistors (between terminals 2 and 7), you can adjust the sensitivity of the chip, but you must keep in mind that reducing the resistance of the resistor you reduce the input impedance of the device.). The resistor can be removed at all, possible interferences with the input circuit. (Not recommended!)

Note: - at frequencies below 1MHz. chip does not work!

The output of the divider is required for matching signal levels. I advise divider circuit to collect in the form of remote probe and well shielded.

Making count, multiply the reading frequency to eight - is the measured frequency.

If you get tired of producing calculations on the calculator or on paper: -Offers a simple revision of the frequency. This requires that all - is to change the reference in the quartz frequency counter! Proizvedёm simple calculation! - Quartz frequency is multiplied by a factor of 1.25. For example, you had a 1MHz resonator. - Then 1.000MHz. multiply by coeff. 1.25 obtain the required frequency quartz equal to 1.250MHz. Everything is very simple! You can even move the decimal point one digit to the right. (Not to be confused - is generally cool!)

By the way - this way you can modify the frequency on the PIC 16F84 (4MHz quartz replace at 5MHz -.. See more computing controller works with a clock frequency of Checked -... OK!).

Publication date 22.03.2003gg.