Sensor and Control

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This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be ...

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These circuits is used to control audio with light. In simple transduction And the change of light. To control the tone.,we is recommended that three ...

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This is of course the simplest electronic code lock circuit one can make. The circuit uses one transistor, a relay and few passive components. The sim...

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This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013.Two CD ...

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This circuit is so sensitive it will detect "mains hum." Simply move it across any wall and it will detect where the mains cable is located. It has a ...

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This circuit was taken from a dancing flower. A motor at the base of the flower had a shaft up the stem and when the microphone detected music, the be...

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This circuit can be used for a toy car to follow a white line. The motor is either a 3v type with gearing to steer the car or a rotary actuator or a s...

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All LEDs give off light of a particular colour but some LEDs are also able to detect light. Obviously they are not as good as a device that has been s...

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This circuit will supply current to the load RL. The maximum current will depend on the second transistor. The circuit is turned on via the "ON" push ...

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This circuit detects the resistance between your fingers to produce an oscillation. The detection- points will detect resistances as high as 300k and ...

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This circuit detects the skin resistance of a finger to deliver a very small current to the super-alpha pair of transistors to turn the circuit ON. Th...

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This circuit operates when the Light Dependent Resistor receives light. When no light falls on the LDR, its resistance is high and the transistor driv...

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This circuit is similar to Light Alarm -1 but produces a louder output due to the speaker being connected directly to the circuit. The circuit is basi...

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This circuit is very sensitive and can be placed in a room to detect the movement of a person up to 2 metres from the unit. The circuit is basically a...

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This circuit turns on a LED when the microphone detects a loud sound. The "charge-pump" section consists of the 100n, 10k, signal diode and 10u electr...

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This is a simple "staircase" circuit in which the LEDs come on as the resistance between the probes decreases. When the voltage on the base of the fir...

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The SCR in circuit A produces a 'LATCH.' When the button is pressed, the LED remains illuminated. The SCR can be replaced with two transistors as show...

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This circuit can be used to detect when someone touches the handle of a door. A loop of bare wire is connected to the point "touch plate" and the proj...

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This circuit is better than reducing the RPM of a motor via a resistor. Firstly it is more efficient. And secondly it gives the motor a set of pulses ...

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Most simple motor speed controllers simply reduce the voltage to a motor by introducing a series resistance. This reduces the motor's torque and if th...

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This circuit is a Courtesy Light Extender for cars. It extends the "ON" time when a door is closed in a car, so the passenger can see where he/she is ...

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This circuit automatically turns on a light when illumination is removed from the LDR. It remains ON for the delay period set by the 2M2 pot. The impo...

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This circuit detects darkness and produces a beep-beep-beep alarm. The first two transistors form a high-gain amplifier with feedback via the 4u7 to p...

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These 4 circuits are all the same. They supply power to a project for a short period of time. You can select either PNP or NPN transistors or Darlingt...

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When the circuit is turned on, capacitor C1 charges via the two 470k resistors. When the switch is pressed, the voltage on C1 is passed to Q3 to turn ...

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This circuit has been designed from a request by a reader. He wanted a low fuel indicator for his motorbike. The LED illuminates when the fuel gauge i...

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This LED illuminates for a few seconds when the power is turned on. The circuit relies on the 47u discharging into the rest of the circuit so that it ...

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This circuit automatically turns on the light through a relay when daylight intensity falls below a preset level on the Light Dependent Resistor (LDR)...

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This works same as the other dark detector circuit. When light is falling on LDR, its low resistance drives transistor Q1-BC547 into conduction. This ...

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