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A Fourth-Order Speech Filter (Based on Texas Instruments Application Note)
Human speech generally occupies an audio spectrum of 300 to 3400 Hz. There is a requirement, especially in telephone circuits, to limit the frequency...
Briefcase Alarm
This miniature alarm unit protects your valuables from theft by sounding an alarm when somebody attempts to pick up your briefcase. It is a...
Farmhouse Lantern-Cum-Flasher
This circuit uses a dual op-amp IC LM358 and two transistors. It can be powered by a 6V maintenance-free rechargeable battery or a lead-acid...
Picnic Lamp
You can take this white LED based night lamp on your picnic outings. The lamp has sound trigger and push-to-on facilities and gives ample...
Pencell Charge Indicator
Small-size AA cells and button cells used in electronic devices providing a terminal voltage of 1.5V are normally rated at 500 mAh. As the...
