±5-V Voltage Converter Schematic Circuit Diagram

Asymmetrical ±5 V power supply is often needed for small, battery-operated operational amplifier projects and analog circuits. An IC that can easily be used for this purpose is the National Semiconductor LM 2685. It contains a switched capacitor voltage doubler followed by a 5-V regulator. A voltage inverter integrated into the same IC, which also[…]

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Noise-Driven Sound Generator Schematic Diagram

Noise-Driven Sound Generator Schematic Circuit Diagram

The sound generator shown here uses its built-in loudspeaker as a microphone when it is in the standby state. As soon as it detects a noise that exceeds an adjustable threshold level, it becomes active. This small, clever circuit can be used as an alarm generator that reacts to noises. You can also use it[…]

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