![]() ![]() If the supply is taken from a single supply unit, the equipotential for the supply can be obtained from a voltage divider network. The capacitor C1 and R3 have connected to signal ground or Equipotential. And a 0V for low state or during the negative half cycle. So it only contains 6V for high state output. But here the emitter of the transistor is connected to the negative of the supply. Thus, the output signal has amplified using a transistor.Īstable multivibrator of an op amp will contain both positive and negative half cycle. So, if it has connected directly to a speaker, the generated sound will not have enough volume. The 741 op amp can deliver only a small output current. Here also the circuit is an astable multivibrator which generates a square wave signal around 3KHZ frequency. This circuit is a tone generator using an op amp. Supply – 9v battery Op amp tone generator circuit The circuit can perform well even without amplification. To improve the output quality, amplify the output signal using a transistor. The output resistance should be adjusted with the power rating of the selected Loudspeaker. In the position of R2, connect the wiper terminal and either one of the end terminals of the pot.Ĭhoose a Loudspeaker with appropriate impedance and power, an ordinary 8 ohms Loudspeaker can work fine. The frequency, f = 1 / (0.69*(R1 + 2*R2)*C)įor frequent tuning, it’s better to replace the resistance R2 with a potentiometer. To calculate the resultant frequency from the values of R1, R2, C1, The audio frequency of the circuit can be changed to wide ranges by varying the values of any of the resistance R1, R2 or the capacitance C1. The circuit has an oscillation frequency about 670-680 HZ. It generates a continuous square wave output. The below circuit consists of an astable multivibrator using a 555 timer IC. A tone generator consists of a square, triangle, sawtooth periodic wave generator circuits, commonly square wave generators. Such periodic signals produce a beeping sound when connected to audio transducers such as a speaker, piezo, etc. A tone generator circuit can be used for various applications such as alarms, bells, indicators, etc. ![]()
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