Wireless keyboard circuit and principle analysis

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The basic circuit of the relaxation oscillator using the double-base diode negative resistance and RC charge-discharge characteristics is shown in Figure 10.1.2(A). When the power is turned on and the S key is pressed, the power supply charges the S through the resistor R. The single junction transistor emitter voltage VE gradually rises. Before the voltage on the capacitor C reaches VP, the single junction transistor is in an off state. When the voltage rises to the peak voltage VP of BG1, the BG1 transistor is turned on, and the capacitor C passes through the emitter. The base B1 is rapidly discharged, so that the BG1 emitter voltage is lowered, when the capacitor


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Electronic components are components of electronic components and small machines and instruments. They are often composed of several parts and can be used in similar products; often refer to certain parts of electrical appliances, radios, instruments and other industries, including capacitors, transistors, General term for electronic devices such as hairspring and spring

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