Telephone Ringtone Generator

This is really a very simple home telephone ring tone generator circuit which is built with applying only several electronic…

55 years ago

Automatic Switching-on Emergency Light

Automatic Switching-on Emergency Light The schematic diagram shown right here is the automatic switching-on emergency light circuit which is controlled…

55 years ago

DC Motor Speed Controller

This is the schematic diagram of DC motor speed controller circuit. The circuit applies two oscillators/timers which are connected as…

55 years ago

Multitone Siren Alarm

Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and…

55 years ago

Pyroelectric Fire Alarm System

This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize…

55 years ago

Report: DC/AC Pure Sine Wave Inverter

Here the project report of DC/AC pure sine wave inverter. This report focuses on DC to AC electrical power inverters,…

55 years ago

Car Cigar Lighter to USB Power Socket

Here is the schematic design of car cigar lighter to USB power port. Nowadays, almost all computer systems have logic…

55 years ago

Adjustable Analog Timer

This is a very simple adjustable analog timer circuit diagram. You can build this circuit just for fun, for newbie…

55 years ago

6 Transistor Tilden’s H-Bridge

This diagram is certainly the 6 transistor Tilden H-bridge circuit; while not as old as the original "basic H-bridge," this…

55 years ago