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8051 / 8052
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Proximity Switch Circuit Composed Of Integrated Magnetic Sensor HMC1001
The picture shows the proximity switch circuit composed of the HMC1001 and operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator here. If taking a magnet with length about 6mm~12mm to close to the HMC1001, when it moves to a certain position, the MR electric bridge`s output voltage would...
Security Light & Switch with PIR Sensor
SB0061 is a pyroelectric sensor module,developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB together with an analog IC (SB0061) and limited components to form the module. High level output (3.3V) of pre-settable variable width (5Secs -18 Minutes) is provided. Circuit diagram of the PIR...
Triple key interlock electronic switch schematic
UNDERVOLTAGE DISCONNECT SWITCH
In the figure, the TL494 is used as the core to form the PWM driver and protection circuit, and the changing frequency is 50kHz. 115V output voltage is sent to P8 after stepping-down and isolating, then it is sent to TL494 error amplifier A1 after getting RMS by passing AD536, and it is used as the system`s closed-loop voltage control. The...
Zero-voltage zero-current switch three-level DC converter
In order to remove circulating current of zero-voltage switch three-level DC converter in zero state, we come up with kind of zero-voltage zero-current switch three-level DC converter circuit. The circuit is shown in the following diagram 1, the main difference between this circuit and zero-voltage switch three-level DC converter is: add...
Composed of HS101/HS201 4 channels remote control switch circuit diagram
HS101/HS201 are a pair of tiny radio transceiver components. The working frequency is 280MHz. It is suitable for digital signal transmission. The control distance is 30 ~ 100m. All the components including the antenna are packaged in one. It is easy to use. The four-channel remote control switch circuit composed of HS101/HS201 is shown as above.
DTMF coding multiple-channel infrared remote control switch circuit
The DTMF codec is the abbreviation of the dual-tone multi-frequency codec. The multiple-channel infrared remote control switch circuit which is composed of the DTMF is as shown in the figure. It is composed of the infrared remote control signal emitter, the infrared receiving signal amplifier, the DTMF signal decoder, the 12-channel data...
Direct infrared remote control switch circuit diagram composed of LS-2
LS-2 remote control switch infrared sensor module is basically the same with the LS-18, in addition, it isused as a reflector. LS-2 Pin diagram form LS-2 internal block diagram Electrical parameters LS-2 remote control switch module operating voltage is 4 ~ 6V (DC), typical value is 5V; Operating current is 2 ~ 4mA; Control output terminal (L1,...
The switch shut off time delay circuit diagram
The switch shut off time delay circuit is shown as below. The switch shut off time delay circuit is composed of the timer, optocouplers, bridge SCR, SCR AC switch. When the control button is released, the keeping motor or other AC start power for 1 hour. Button closure. 2 pin voltage step-down Ucc / 3 below. The output pin 3 rises. LED lights....
Wireless remote control switch circuit 5
Wireless remote control transmitter circuit is composed of control buttons S1 ~ S16, resistors R1 ~ R3, capacitor C1 regulator diode VS, crystal oscillator BC1, DTMF encoder IC IC1 and IC2 wireless remote control transmitter integrated circuit components. It is shown as above. Components selectionR1, R2 and R4, R6 ~ R39 use 1/4W carbon film...
temperature detection voltage-frequency switch circuit
As shown in the figure, the temperature detection, temperature-voltage switch and voltage-frequency switch circuit is used to remote detect temperature. We connect the circuit and wireless transmitting circuit forming a temperature detection remote control transmitting circuit. In the circuit, temperature detection and temperature-voltage switch...
Solar Automation Switch Hardware
This is the main building block of the home automation system. My goal here was to design one circuit board that could be customized for different functions by selectively populating the board, adding daughter boards, and changing the software. Currently, this board is used to implement the functionality of a network connected light switch, a ther
Dimmer Switch General Purpose Electric Power Control
Dimmer Switch Introduction Dimmer switch can be used to replace your electrical switch for lamps, heaters, or some types of electric motor. Dimmer switches..
BQ24105 Switch Mode Lead Acid Battery Charger
Switch mode circuits can implement the lead acid battery charger with a more efficient. It can be constructed using bq24105 battery charger controller. The..
Discrete High Current Switch Mode LED Driver
This is a discrete high current switch mode LED driver circuit. The basics of this circuit is a buck-converter principle. The efficiency of this circuit is 80..
High Frequency Switch
This is high frequency switch circuit. This circuit uses the 2N4391. When it is off, it will provide a high off-impedance (<0.2pF) and low on-resistance of..
220V Touch Switch
This is a 220V Touch Switch circuit. This circuit is used as switch which turn off and turn on the the electronic device that is connected to the 220V home..
Basic Thyristor Switch
The silicon controlled rectifier (S.C.R.) is called as the thyristor. It is like a diode, when the cathode is negative with respect to the anode, the current..
Radio Buttons Using Push On Switch Latching Circuit
This is a switching circuit that provide latching mechanism to make a set of radio buttons using push buttons. This circuit consist of interlocking circuit..
Remote On-Off Switch through Small Transformer
This is a remote on-off switch circuit. With this circuit, we can take the benefit of using small switch to control larger AC current from high power devices..
Direct Coupled On/Off Touch Switch
The following touch switch circuit uses a CA3240 dual BiMOS op amp to sense small currents flowing between the contact points on a touch plate. Since this..
The VHF antenna switch
Finally I have found a use for a bunch of DIP-style RF relays I acquired in a grab-bag from a discount electronics shop some time ago. These babies are sealed totally, and rf shielded with low contact capacitance. Perfect for VHF frequencies. They are 12 volt and have a fairly decent coil resistance, although I wish they were latching style. I hav
Arduino LED Control Using DIP Switch
Automatic Switch Project
The objective of this controller project is to have automatic block and switch control of five separate engines that run on two completely independent loops of track. Part of each loop is outside (public) and part is inside (hidden from public view). The inside part has switch controlled sidings where the idle trains wait. The inner loop can accom
Automatic Switch Project
Model railroad turnouts, often called switches, can be controlled in a number of ways. The most basic is a manual control that is thrown by hand. Remote activation is usually accomplished by either pneumatic (air) or electrical means. The project that is the focus of these articles has several turnouts that must be remotely activated by a...
Automatic Switch Project 2
The eyes of the switch control system allow the microcontroller`s "brain" to know where the trains are located on the layout. This insures that only one train is on the main line at a time and that the switches are set so that the train returns to the proper siding. There are many ways to sense whether or not a train is at a particular spot on a
Vox VFS5 foot switch for Vox VT15 and Vox VT30
10 Way Electronic Switch
The schematic is shown above, and two switches S1 and S2 are used to control the outputs. The main work is done by U2 a CMOS4017 decade counter divider IC. At switch on, C1 is quickly charged by R4 and a brief reset pulse is applied to to the reset pins of both U1 and U2. This results in U1, a 7 segment display display driver and decade counter sh
How To Build A Simple Code-Operated Switch
This is a simplified version of the Universal Keypad-Operated Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of situations where it will still be adequate. The circuit is drawn with a 12-volt supply -
Keypad Operated Switch No.2 - testing your circuit
The prototype of Keypad Switch No. 2 was built using only the Stripboard Layout as a guide. So - if you have faithfully reproduced that layout - you will have a working circuit. Once you`re satisfied that your layout is correct - and you have made a careful and thorough check of the underside of the board - it`s time to power-up the circuit and tes
How To Build A Simple Keypad Switch With A Tamper Alarm
This circuit is designed to be used with the Universal Keypad Operated Switch. A few genuine mistakes - made during code entry - will not activate the device. But repeated attempts to find the correct code by trial and error - will cause the keypad to lock-up - and the Buzzer to sound. Connect the coil of a suitable relay to the Buzzer output - a
A Simple Keypad-Operated Switch - with enhanced security
This is a universal four-digit keypad-operated switch - with a difference. Instead of entering the security code one number at a time - the four keypad buttons must be pressed simultaneously. In other words - the four numbers must be entered in parallel. The intruder won`t know the code. He won`t even know how many digits there are in the code. An
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...
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Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial
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