live line detector indicator circuit schematic
If the unit is brought close to a live conductor (insulated, and even buried in plaster) capacitive coupling between the live conductor and the probe clocks the...
simple capacitive touch sensor
Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacita...
capacitive sensor circuit diagram
The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the gla...
simple one wire touch detector
This simple circuit can be used to activate whatever you like, for example, by connecting it to microcontroller, relays, secret alarms, robot applications or ju...
capacitive sensor
For proper operation, circuit ground must be connected via a small value, high voltage-rating capacitor to one side of the mains supply socket. The "Live" side ...
temperature controlled switch
It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you re building this...
temperature monitor
Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and li...
using led as a light sensor
This circuit shows how to use an ordinary LED as a light sensor. It makes use of the photovoltaic voltage developed across the LED when it is exposed to light. ...
simple optical switch
When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower val...
water pump relay controller circuit schematic
By means of a Relay, employed to drive a water pump, this circuit provides automatic level control of a water reservoir or well. The shorter steel rod is the ""...
plant watering watcher circuit schematic
This circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the mois...
water level indicator circuit schematic
When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. ...
temperature controlled soldering iron
One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such a...
beam break detector for camera shutter or flash control
The IR detector (IC3) controls an LM 7555 CMOS timer (IC2) which operates in mono stable mode. When the beam is broken, IC2 is triggered and its pin 3 output go...
save your ears a noise meter circuit
Do you have disco ears? If people ask you this and you re still well below 80 , you may be suffering from hearing loss, which can come from (prolonged) listenin...
Optical module
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musical continuity
A continuity tester is handy for checking that there is an electrical conducting path between two points. The following circuit has the advantage that it is ver...
ldr engineer
LDR( Light dependent resistor ) Engineering is a technique of making several electronics circuits following thelogic of a simple light and dark sensor using tra...
dyp me007 ultrasonic range finder using ne555 and multimeter
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darklight sensor using transistor
Automatic dark detector senses darkness. As the light level decreases and LDR meets the maximum threshold resistance, the circuit automatically switches on the ...