The frequency meter by use the LC resonance circuit that adjustable until the frequency show peak amplitude.
Category: RF – Oscillator
More circuits about oscillator, pulse, frequency , and others.
This is a FM Wireless Microphone circuit Which we add one transistor in the RF amplifier. So this circuit have two resonance circuits and also two trimmers. This cause have Higher efficiency and transmission far up.
The band rejection filter circuit is not wide filter that can denial the frequency up to 60dB by we used the TL071 single chip op-amp it is very low distortion and work good at output to maximum to 100kHz or the range 1Hz to 20kHz. In the circuit we defined three resistors R1,R2,R3 are like value to 100K, and then two capacitors C1,C2 are equal to 330pF, For will reject the frequency at 50Hz. By we can select the parts with the formula is F = 2×3.14xRC , And to get rejection well than 40dB if we should the resistor …
This Sawtooth wave generator circuit include of the frequency oscillator is controlled by current. Which can generate the sweep frequency in wide range.
This am radio receiver circuit with earphone is a saving version that use a few parts, cheap , easy to build and suitable to be assembled to study,3V batt.
In the Sine wave oscillator circuit often to be use the thermistor and Incandescent lamp, for upset the output of circuit has fixed value, the resistance of the thermistor dependent on temperature and as a result to voltage drop across of it. From the slow response of the thermistor make to properties of temperature against resistance is not linear like with that do not distortion value in this oscillator circuit. In this circuit, we use a zener diode in performs this function instead by is used to limit a voltage. Then, the bridge circuit consisting of R1, R2 and C1, …