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Additional info for Elektor Electronics (February 2007)

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The unknown capacitor is connected in parallel to the standard capacitor, and decreasing the value of the standard tuning capacitor brings the resonant condition back. Let this new in-circuit value of the tuning capacitor be CB pF. e. 3 MHz by connecting different crystals of known resonant frequencies. ) Transistor T1, along with capacitors C3 and C4, and crystal Xtal, forms the Colpitts oscillator. The crystal operates Fig. 3: Single-layer coil near its parallel resonant frequency. NecThe formulae (1) to (3) are based on essary positive feedback is obtained via the assumption that there would be no capacitors C3 and C4 with a feedback facmutual inductive coupling between the tor β = (C3+C4)/C3.

The other is a timing pulse, Fig. 1 36 which is applied to pin 1 of IC1. 5 second to 3 seconds, depending upon the water level in the tank) followed by 4-second low level. Thus, during positive duration of timing pulse at pin 1 of IC1, the frequency counter is allowed to count the number of negative going pulses which are continuously available at its pin 2. At the same time the pnp transistor T1 remains cut-off due to the positive voltage at its base, and CIRCUIT Fig. 2 Fig. 2) remain off. However, at the end of positive pulse at pin 1 of IC1 (and base of transistor T1), the frequency counter is latched.

Apply RF power to the resonant circuit after turning switch S2 ‘on’. 5. Tune the resonant circuit to get a peak. If no peak is obtained, try with another work-coil. 6. Note the capacitance value from the dials of the tuning capacitors. Let the sum be C. 7. Calculate the frequency of the incoming RF signal using the following relation: MHz Here, Lw is in µH and C in pF. Calibration If a standard variable capacitor is not available, we may use, after proper calibration, a 2J type variable capacitor which is generally used for radio work.

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