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PIR Sensor Security Light & Switch
Moderately priced Passive Infrared PIR Sensor modules are now widely available. By using these readymade and pre-configured PIR sensors, even an average el..
Analog Line Switch Circuit
This analog switch circuit is designed to switch on or off and analog line. it consists of two analog switches in IC form that are controlled by two pushbu..
Power Switch with Infrared Proximity Sensor
The power switch with infrared proximity sensor is intended for the recognition of obstructions at distances of a few millimetres to a few centimetres. Thi..
Humidity Control Switch Circuit
This humidity controlled switch circuit turns on and off an electrical load (for example a heater) depending on the moisture content of the surrounding air..
Water Switch Sensor Circuit
Clock Alarm Light Switch Circuit
Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the int..
Step Switch Selector
As the name indicates, the step switch selector circuit is intended to choose one of up to four analogue switches, which it does with the aid of some less..
Solar Panel to Battery Switch Circuit
When loading a battery during the day from a solar panel it can be partially discharging through the panel after nightfall. This solar panel power switch circuit replaces the diode and connects the panel to battery through a relay contact. When the voltage is high enough to engage the relay and the LDR receives enough light in order to open T1,
Automatic Light Switch Circuit
This light sensitive automatic light switch circuit is intended to be connected at the main 220V supply. The circuit will connect a 220V lamp at the nightf..
Light Sensor Switch Circuit
This light sensor switch circuit allows the automatic connection of a lamp when the light is low (at nightfall) and will maintain the lamp ON for a certain period of time. From the moment that T4 and T5 are opened, relay`s LED start to light and powers the lamp. As soon as one of the transistors is blocked the lamp will go OFF. The phototransistor
Light Activated Switch
The light activated switch circuit can be used for switching OFF a particular lamp or group of lamps in response to the varying ambient light levels. The u..
Security Light & Switch with PIR Sensor Update
This is a simple update to Mr. Hareendran`s PIR Sensor Security Light circuit. It has a shortcoming limits the relay voltage to approximately 3. 3V. While this may function with some 5V relays, it will not function with all. The nature of an emitter follower Darlington forces the output voltage to be two junction drops below the base drive voltage
Overheat Detector Alarm Switch
The circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and directly proportional output in mV, over the zero to +155 degrees C temperature range. This can be used as part of fire smoke detectors but do not use it as a home fire alarm system. Here the output of the LM35 is applied to the...
Sound Activated Switch Circuit
With this sound activated switch, control by sound may be very useful, not just on a robot but also for a bit of home automation, for example a sound-activ..
Door Light Switch
This automatic door light switch circuit turns ON a lamp when a door is opened then turns it OFF when the door is opened again. The working principle of th..
Whistle Light Switch
With this whistle light switch you can turn on and off the lighting installation. The main part of this circuit is the UM3763 IC, produced by UMC. The piezo-ceramic buzzer is used here as a microphone and when it receives a tone frequency between 1. 2 kHz and 1. 8 kHz, the IC`s output will go HIGH. This means that the light will go ON if it was...
Non-Contact Proximity Switch Circuit
Simple, highly sensitive capacitive ON/OFF switch pads change the state of a latch and turn on an LED without requiring actual physical human contact. The pad may be insulated. A range of 12mm is easily obtained and sensitivity is adjustable. Central is the 74HC02 CMOS NOR Gate IC. The gate input capacitance is typically only 3pF. To enable a suff
clap switch schematic image
555 Touch Sensor Switch Circuit
This kind of sensor switch is suitable for making touch operated bells, buzzers of small toys which operate for a small time and then switch off automatically. The input impedance of the trigger is very high and the touch sensor switch can be triggered by the voltage induced in the human body. The relay is a 12 V DC relay operating at currents les
555 Momentary Switch Circuit
Based on NE555 this circuit turns on and off the IC output by a momentary switch. In other words it works as a mechanical latching relay, but the circuit backs to the start condition when you switch off the power supply. This feature is often required in automotive devices. No relay contacts are used, infact I connected the output to a led. Once t
RF Based Wireless Remote Control Switch
It is often required to switch electrical appliances from a distance without being a direct line of sight between the transmitter and receiver. As you may..
Bedini/Cole Bipolar switch
My modification, i have two trigger coils , two power coils, one reed switch. The wheel is 4 north pole magnet, it generates 9 radiant pulses per..
Use for the Tesla Switch
Thank you very much I will try that. @StevanC What do you think, are we making some progress or should we stick to your design scratchrobot..
Hubbell Limit Switch
Engineered Lifting Systems solved a typical crane two blocking problem with circuit limit switches and flux vector drives. ..
Light Sensitive Staircase Switch with Triac
Light Sensitive Staircase Switch with Triac , Operation of the third circuit is much similar except that it has photo sensitivity. The circuit is shown in Schematic When there is no sufficient l..
Switch De-Bouncer Circuit
The 555 circuit can be re-triggered if the input is held low longer than the output pulse. To prevent this happening, I have included a further timing circuit comprised of the 1Meg resistor and 47n capacitor. Normally, the 47n capacitor is discharged via the 1 Meg resistor. When the switch is pressed the capacitor quickly charges and provides a br
Infrared Remote Control On/Off Switch Electrical Mini Project
This is a good Electrical project report on Infrared Remote Control On/Off Switch and was Submitted in partial fulfillment of the requirements for the award of the degree of Bachelor of Engineering in Electrical Engineering and is used to switch on/off the Home Appliances by using a standard Remote control. The system is used to switch on/off upto
OEM AUX Light Switch Diagram
I decided to throw together a schematic of how the OEM AUX switch should be wired, and print it so that when I install the wiring I would have a handy reference. Figured I would post it. Here is another breakdown of the switch pins, keeping in mind that thepin layout is labeled while looking INTO the terminals, with the locking tabs on the
Automatic Headlight Brightness Switch
2 line intercom plus a telephone changeover switch
Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the other telephone. In this simple parallel line operation, the main problem is loss of privacy besides interference from the other phone. This problem is obviated in the circuit presented here. U
Each audio/video output can be switched to any of the 8 inputs, separately. One module drives one audio/video output and has a 34-pin connector to plug into the system interface. You can use video OPA-s on the 4051 output instead. Note that you can get full integrated video multiplexers from.
Automatic Headlight Brightness Switch
This simple circuit can be wired into your headlight switch to provide automatic switching between high and low beam headlights when there is oncoming traffic. Simple electronics project with circuit diagram..
555 Timer Circuits
RC Model Toy Circuits
H Bridge Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial