Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
DIY HV Variable Cap
DIY PMA alternator
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Power Control Circuits
Power Control Circuits
Quadruple semi-continuous casting machine speed control circuit
Circuit from the main circuit, trigger circuit, speed negative feedback, negative feedback differential voltage, current cut-off circuit, loss of field protection and other com
Eggs warming control circuit
Circuit is shown. (1) DC power circuit power switch S3, 220v AC voltage by T Buck, UR rectifier, C3 and C4 filter, generating + 9V voltage, supply Kl drive control circuit, a b
12V battery production controller
Circuit shown in FIG. Circuit by the battery, the controller, with electrical and charging parts. Wherein: Zener diode DWl, resistors R1, R2 composition undervoltage detection
Level one thyristor-controlled circuit sink type b
Circuit shown in Figure 11-14. It uses a one-way thyristor, is poured into the liquid level automatic control circuits. Electrodes for detecting sensing element for water or ot
Dynamic braking circuit control thyristor
Circuit shown in Figure 3-148. The circuit eliminates the need for step-down transformer, using thyristor for brake control, for small capacity asynchronous motor braking amoun
A control circuit reversing braking and reverse grading speed control function
Circuit shown in Figure 3-168, which uses the controller SA grading speed and reversing control; reverse brake connected to the rotor circuit overcurrent relay KI to control; c
Start reversing contactor interlock control circuit
Circuit shown in Figure 3-22. Figure, KMi and SBi are forward contacts and forward buttons, KMz and SB2 are reverse contactors and reverse button, SB3 for the stop button.
Intermittent one start and stop cycle control circuit
Circuit shown in Figure 3-76. It uses two time relay to achieve control. KTi and KTz control the motor running and downtime.
Third batch start and stop cycle control circuits
Circuit shown in Figure 3-78. The time line also use two relays to achieve automatic control, but the line structure than simple. The line can be achieved intermittently motor
Intermittent start and stop cycle control circuit of the four
Circuit shown in Figure 3-79. It consists of two delay circuits, respectively. RPi adjustment potentiometer and RP2, respectively, can be changed and stop the motor running the
Intermittent start and stop cycle control circuit Five of a
Circuit shown in Figure 3-80. Which controls part of the transistor multivibrator. Multivibrator is a strong positive and negative feed-forward amplifier, its two branches are
Six a start and stop intermittent cycle control circuits
Circuit shown in Figure 3-81. The circuit uses a transistor delay circuit to achieve start-stop cycle control. You can take the hand moving and automatic manner. Circuit is pri
Intermittent start-stop cycle control circuit of seven b
Circuit shown in Figure 3-82. It uses 555 IC A motor to achieve automatic control of start and stop cycles. Adjust potentiometer RPi and RPz, respectively, to change the motor
The main circuit in order to start the control circuit
Circuit shown in Figure 3-83. The figure shows that only when the contactor KMi after pull (ie, after the motor Mi first start), KM2 to pull (ie Mz after start)
Host stall after stall to auxiliary control circuit
Circuit shown in Figure 3-84. Be seen by the two electric motors can be started separately. But only when you press Host (Ml) of the stop button SBz (after contact KMi release)
Incandescent Yeonsu electronic controller 1
Circuit work process is: When the momentary switch S between, since the voltage across the capacitor can not change suddenly, the Pi C zero voltage across the SCR vs no trigger
Incandescent Yeonsu electronic controller 3
Closing switch S, the power supply positive half cycle, the power by VD1, Rl, VD2 to charge the capacitor C, C at both ends of the electrical pressure gradually increased, but
Power source is insensitive to load changes
The circuit is analogous to a voltage or a current source but delivers fixed power levels that are independent of the load resistance. A feedback loop senses load power and automatically adjusts the output voltage to maintain the desired power level. The circuit measures the output current with a current sensor, IC2 and then determines the...
Soft-start controller is gentle on loads
The control circuit in Figure 1 senses a given load and automatically soft-starts the load by synchronously adjusting the power to that load. You can also manually adjust the power delivered to the load by controlling the phase angle of the line voltage across the load. The phase-angle adjustment for every ac half cycle covers 0 to 180°.
Electronic Fuse / Low Pass Filter
This is adjustable elctronic fuse that can be used to protect power supplies from short circuits or can be also used to limit the current usage. It can be adjusted for currents from 100mA up to 4.3A.
G STRAIN ENERGY ABSORBER
It is important to know that transistors Q1,Q2,Q3 must not work like an astable (tri-phase) multivibrator (you could verify it on scope (no square waves but NON LINEAR wave between XB, YB, ZB must be displayed on the scope).
Regulator Combination Circuits
There are a number of ways to obtain the low voltages required to run small projects from the wall power outlet. The simplest way is to buy a factory-built molded supply which is designed to plug directly into the wall outlet. Some such supplies have an internal voltage regulator and need no additional parts, others provide an unregulated DC...
2500W Phase Control with TLE3103
This circuit controls resistive and inductive loads up to 2,500W. Its main functional device is an integrated phase control circuit - Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An additional feature is the low voltage input to enable/disable triac firing enabling/disabling the...
PIC hydro system controller
The ELC presented here has some flexibility, thanks to being software-controlled, but also has its limitations: It's intended for microhydro systems that employ a single-phase synchronous alternator, working at 220-240V, 50Hz, in a power range up to 25 kilowatts, and using up to eight dump loads, some or all of which can be "useful" loads, such...
Backup Power System with PIC16F870
The PIC16F870 keeps track of battery voltage as well as both charging and discharging currents. It also drives the 4 digit display, and switches the AC and load relays. The basic operation is as follows: While AC power is available, the battery voltage is constantly monitored and topped off as needed. When the AC power fails, the load relay...
Water Level control and monitor with PIC12F675
I found some similar circuits but aren't good enough for me. Some circuits measure the water's resistance to determine the level. That is dangerous for drinking water (contamination) or explosive liquids because electricity is in contact with water. The Pressure sensor have a tube. The tube end on the botton of the tank. When the liquid fill the...
Electronic fuse circuit
Full short-circuit and overcurrent protection is given by this circuit suitable for workbench applications in technical schools and laboratories where there is a need to work directly with the mains. Additional features are a clearly visible red lamp indicating that the voltage is present, good isolation of the output circuit when the unit is...
220V Mains Quality Monitor
With this circuit you will be able to monitor the quality of the mains. There are 4 distinct sections, each supervising a parameter pertinent to the quality of the supply line. The noise section consists of a 50Hz filter and a speaker where you will hear the noise present on the line. The bicolor LED should be adjusted for the least light with...
Auto poweroff for power supplies circuit
Probably the easiest way of doing automatic switch off is with relay logic. In the diagram, the box marked RL1 is the coil, the 2 in the coil box tells you there are two sets of contacts somewhere on the circuit, operated by this coil. In this simple circuit, it's easy to see them!Sw1 is a momentary push switch. When it's pushed (contacts...
Moisture detector with pump controller
This moisture detector with pump controller is built around the special purpose LM1830 IC. The LM1830 is designed to detect moisture by passing an AC current through a set of probes. An internal comparator compares the resistance of the probes to an internal reference. When the resistance between the probes is low (indicating the presence of...
Automatic Level Control Signal Circuit
Involvement is a modified version of the classic circuit of automatic level control signal used in tape recorders. The purchase price of the components (using TL072) does not exceed CZK 60 for a channel. For a range of entry level audio signal may be replaced by the operation, which would be matched signal level so as not to overmodulation or...
Power control circuit
Stepper Motor Circuits
Remote Control Circuits
Direction Finder Circuits
Motor Control 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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity