Free Simple Circuit Diagram
This is a simple high gain JFET audio amplifier circuit. This circuit need very low power but it provides high gain amplifying function. It also called “JFET µ amp”. Here is the circuit : The lower drain current is, the more gain is obtained because µ of a JFET increases as drain current decreases. However it will sacrifice input dynamic range […]
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This is single op-amp tone control circuit. This circuit is a hybrid low-pass, high pass and one-pole circuits with attenuation and gain. This circuit is the solution for limits cost because it requires a minimum component. Here is the circuit : For the tone adjustments, the midrange frequency is 1 kHz. It gives about ±20 dB of cut and boost […]
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This is true subwoofer circuit. This circuit is used for 15- to 18-inch woofers and will not work with 8- or 6- inch “subwoofers.” It has bass-reflex, a good infinite-baffle, or foldedhorn enclosure, and driven by driven by an amplifier with at least 100 watts. This circuit will most useful for home theater applications, which play material that does have […]
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The audio spectrum range of human speech is most frequently on 300 Hz to 3 kHz. In phone, this range should be limited. Usually, DSP chip is used to perform this limitation but to reject high-frequency components, it requires an anti-aliasing filter. We can solve this problem by using a single-supply phone speech filter circuit. Here is the circuit : […]
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