Relay Circuits
- Page 8-
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 ""water high"" sensor, whereas the longer is the ""water low"" sensor. When the water level is below.... -
Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater.... -
This 555 timer circuit toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and.... -
A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts.... -
The two circuits illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to +12 volts.... -
Here is the project/schematic of LM741 dark sensor relay switch circuit. The circuit will activate the relay switch when there is no light on the surface of LDR.... -
A very useful, easy and interesting project of a flip flop relay circuit using a 555 IC. The circuit will continously flip flop or on and off two relays one by one. .... -
get it on and off continuously. The circuit is using a well known NE555 timer IC which is a very famous IC due to its uses in the wide variety of electronic circuits. In this circuit this IC is connected as a astable multivibator and the 12 volt relay is.... -
In this circuit the 555 Timer IC is connected as a astable multivibator and a 12 volt relay is derived through the pin 3 of the IC. The IC generates continues pulses at pin 3 which will activate and deactivate or flash the relay accordingly. The flashing.... -
on the desired temperature. The circuit can be used for many purposes for example switch on the fan on the desired temperature or activate emergency temperature alarm etc. The circuit can be powered by a 9 volt battery, adaptor or transformer. The two BC547B.... -
Here is a schematic of a simple water or liquid level sensor relay switch circuit, which can be used to switch on or off electronic appliances at the desired level of water. The circuit is ideal for automatically switch off the water pump when your water.... -
The circuit can also be triggered by logic ICs(TTL/CMOS) using proper interfacing method. I usually use another relay that serve as the trigger button when interfacing ICs to latching relay circuit. .. -
The transformer is a 220V to 12V, 50Hz and 3. 6VA PCB type transformer. The model seen in the photo is HRDiemen E3814056. Since it is encapsulated, the transformer is isolated from the external effects. A 250V 400mA glass fuse is used to protect the circuit.... -
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is.... -
A simple liquid level switch circuit with diagram and schematic.This can also be used as water level switch,fluid level,float level and tank level switch.... -
A photo relay or light activated relay is a circuit which opens and closes the relay contacts according to the light. Here a photo diode is used to sense the light. The photo diode offers a high resistance when there is no light falling on it. Here the photo.... -
The circuit diagram of an Automatic Street Light Controller Circuit is explained in this post.... -
This is a relay driver that is based on a PIC16F84A microcontroller. The board includes four relays so this lets us to control four distinct .... -
Function: To prevent equipment damage from pressure., and for delay other appliances connected to the output of the relay. 4011 IC, Diode, Relay, .... -
The relay logic circuit forms an electrical schematic diagram for the control of input and output devices. Component: Resistor, Capacitor, .... -
The thermostat circuit built to control a 1300 watt space heater which are controlled with a small pulse transformer. Component: LM339 IC, .... -
This circuit bellow include in the Relay Timer Circuit. One of the most commonly used circuits is that of the 555 Timer I.C. The circuit is .... -
The following circuit shows about BC547 Transistor For Output Relay Delay Audio Amplifier Circuit Diagram. Features: disconnects the speaker immdiatly when the .... -
The success or failure of your lighting upgrade efforts rides on the quality of your parts and the quality of your work. It matters how carefully you route wires to avoid chafing insulation. It matters how well you solder connections (crimps and sloppy or.... -
Basically, the circuit is using relay (2 set of Relay for each Motor) to switch the direction of the motor and MOSFET (1 set of MOSFET for each Motor) to control the speed of the motor. I will divide the MOSFET + Relay circuit into 3 part for the.... -
A relay is an electro-mechanical switch that opens and closes under the control of another electric circuit. When current flows through the coil of the relay, a magetic field is created that causes an armature to move, either making or breaking an electrical.... -
I have a project in which i will control the speed of the electric fan (220Vac, 60W, 5A max.) through the microcontroller automatically depending on.... -
guys i need a 2 circuit the one is when power applied the timer will trigger and the relay will remain off when the timer runs out the relay will turn .... -
3V Battery operated, Small portable unit This circuit was intended to activate a relay by means of a hand clap. Further claps will turn-off the relay. An.... -
This relay driver boosts the input impedance with a regular BC547 NPN transistor (or equivalent). Very common driver. It can drive a variety of relays, including a reed-relay. Transistor Q1and Q2 are a simple common-emitter amplifier that increases the....
New Circuits
-
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
Popular Circuits
This design uses a Motorola MPX4115 Silicon Pressure Sensor, a Dallas Semiconductor DS2438 Smart...
Testing loudspeakers is covered in some detail in the passive crossover article (see Design of...
The input audio signal is fed to pin 3 of Ul, an LM386 low-voltage amplifier, via C3 and Rl....
This rf detector can locate low-power transmitters (bugs) that are hidden from sight. It can...
This circuit operates in the astable mode and at the end of the first period (up to several...
The schematic below illustrates dividing a crystal oscillator signal by the crystal frequency to...
You can easily build a barebones Arduino yourself. This project shows a breadboarded Arduino...
DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same...
This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar...
A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so...
Here`s a simple low supply rail detection circuit that costs peanuts and takes just 20 minutes or...
There are a few situations when a power failure is particularly difficult to handle. Some of...
Integrated circuit Ul (an NE602 double-balanced mixer) is a combination oscillator and frequency...
As shown circuit 555 is at the core of the flash circuit, when their normal work, the light...
As shown for the OPA37 constitute a low-noise preamplifier. Input signal is applied...
As shown in FIG circuit protection circuit is the use of optocouplers or not the on-off control....
Automatic reclosing PLC control program designed according to the Control of automatic reclosing...