Control the volume of the double channel with a single potentiometer ----- Volume Controller

Control the volume of the double channel with a single potentiometer, Volume Controller Keywords: Control the volume of the double channel with a single potentiometer The volume control of the two-channel audio is generally used. The two outputs of the potentiometer must be synchronized, that is, the output voltage must be consistent, otherwise the sound of the two channels will be a small. Even if there is something disagree, it will be obvious during small volume. When the double potentiometer is damaged, it is sometimes not found to change the same model. To this end, the author designs a single potentiometer to control the double-channel volume control circuit. Of course, if only one potentiometer is used, the single potentiometer cannot control the two-channel, and the circuit must be increased. The circuit of the two-channel volume is controlled by the single potential device as shown in the drawings. The circuit is controlled by adjusting the Tubing of Q1, Q2. The base of Q1, Q2 is connected in parallel, when the RP is adjusted, the bias of Q1 and Q2 changes, which also changes, so that the output voltage changes to the purpose of adjusting the volume. Here, Q1, Q2, R1, R2 are equivalent to a two-channel potentiometer, and the RP can control the output of the two channels. This achieves the purpose of controlling the two-channel volume with a single potentiometer. R3, C3 is a current stream filter circuit, preventing power supply voltage fluctuations or mutations from q1, Q2 bias, otherwise there is noise string into the audio signal. When the volume to a minimum. R3 also prevents the power supply positive terminal from directly to Q1 and Q2 base. Q1, Q2 must select the same type and the three-pole consistent, otherwise the output voltage will be a large smaller, causing the sound of the left and right channels.

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