Free Simple Circuit Diagram
This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles, and bicycles for fun kid not only that, this circuit also used in models and other games. The oscillation of IC1A and IC1B gates produces the typical dual tone sound of Fire-brigade or Police […]
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To make LED works, you need a voltage source that is higher than the LED’s forward bias voltage, and it’s higher that 1.5V (around 2V for red LEDs). Fortunately, now you can make a LED flasher circuit that needs only 1.5V or a single cell battery to work. Here is the schematic diagram of the circuit: The core of this […]
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This audio power amplifier is very good for your portable devices, or for your headphones amplifier. The circuit of this audio power amplifier is very simple, consist of only seven components. Here is the schematic diagram of the amplifier circuit: Low harmonic distortion give you a hi-fi power amplifier, but in a very small wattage. Depending on the LM386 variants, […]
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This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3 seconds for frequency sweeping down. You can change the warbling frequency of this alarm siren by changing the C1 capacitor value. You can vary the value between 10 uF to 47 uF and get […]
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