JFET Low Noise Preamp

Noise, in amplifier circuit, is generated intrinsically by each components inside the circuit. Resistor, capacitor, and semiconductor generate noises. By simplifying the design of a circuit, we can minimize the noise especially if we can push the number of components to the lowest count. Here is one example of such design. The gain of this low noise amplifier is determined […]

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Single Chip Two-Tones Siren

Kids like the police or fire-brigade cars siren sound. This circuit can generate dual tone like Police or Fire-brigade cars siren sound. This circuit usually installed on battery powered cars, bicycles, and motorcycles. Not only that, but also can be installed in models and other games. Here is the schematic diagram of the circuit: Basically, this circuit utilize the IC1A […]

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