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
Remote Control Circuits
Remote Control Circuits
Simple current limiting circuit
When the current is less than the value set, the bias current provided by R1 leads the P3 to be saturated to conduct. And it can not afford to control the current. When the current is greater than or equal to the set value, the pressure drop on R would increase and be close to the pressure drop of R2 after acrossing the transistor junction. Then i
TheCircuit of One-hour Timing Circuit Using LM122
In this figure S1 can start timing and when the timer starts, turning this switch has no effect.S2 is the OFF switch in the middle and turning this switch can make the timer complete the procedure: charging-open circuit-discharging. Because of charging stopped halfway, the charging position would return to the work state of the timer s output...
The FM modulation circuit of crystal oscillator
In the figure is the FM modulation circuit of crystal oscillator. FM modulation has direct and indirect FM ways, the direct FM method is to directly change the frequency of the oscillating circuit, it`s simple, but as it is the LC oscillating circuit, the bias is kind of noticeable, and the stability is weak, i.e the frequency is easy to be...
The dual-way control SCR liquid level control circuit
See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water level is below b, Vp-b?R3Ã—VDD/?Rw1+R1+R2+R3?<1/3VDD, 555 is offset, SCR is triggered and...
The eight-way remote control circuit diagram composed of module
Is an eight-way signal remote control selection circuit composed of ZHJ-9904 ; (B) is remote control transmitter circuit; (C) is the eight-way switch control circuit; (D) is remote control transmitter.
The electric thermometer circuit composed of LM134
This is the electric thermometer circuit composed of LM134. In the circuit, the voltage or current output by LM134 is in proportion to the thermodynamics temperature, which can be read out on the 100?A meter, the test temperature range of the meter is -55?150?. The power supply can work even when the voltage is under 1V, but when the precision...
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....
The thermometer circuit composed of LX5600
When this thermometer is used in the room, it can work in the intermittent way, and this working state can be kept in the temperature test circuit, because internal temperature doesn`t change sharply. The astable multi-resonance oscillator consists of VT1 and VT2, i.e the interval oscillator circuit, which samples per 1s, and the interval time...
The time delay circuit diagram composed of transistor
It can set delay time according to the voltage Us and resistor R. In the circuit, S1 is the the discharge switch of capacitor C. When the switch S1 is closed, the stored charge on C will be released through S1 to ensure the accuracy of the delay time the next time. VD1 and VD2 are used to eliminate the impa..
Infrared remote control receiver for Media Centers
A few time ago I decided to create a media center box to replace my DVD player, sattelite receiver, VCR and my kid`s Play Station 2, toone device. So, I made a core 2 duo processor system that actually replaced with succeed, all my electronic devices. The only thing that was missing was a remote control to switchOn/Off my Media Center. After I sea
2 channel RF remote control
The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you wantto control your garage door, the only way is to use some RF remote control. The circuit (transmitter and receiver) uses few components and ordinary (I love few component circuits)....
Infrared Light Fan Remote control system
Powerline Carrier-Current Remote Control or Intercom
Using 567 IC tone decoder/detector, we can build a remote control and or intercom. This circuit can be used to control a relay, or to carry an audio signal..
tv remote control jammer
This is a TV Remote Control Jammer circuit. Remote control use modulated light to combat eer infrared nvironment/background infrared noise. Your room heater,..
General Infrared Remote Controlled Relay
This relay circuit is controlled by almost any type of infrared remote controller. This circuit works on assumption that almost all remote controller use high..
This is a distillation of my " design notes ", with more practical details as I move along with the construction, and (in due course) some pictures. Right at the moment I`m using it as a kind of progress report for myself - it`s a mixture of immediate plans and actual construction, so isn`t too clearly structured! The signal control circuit is on
Serial Remote Control for the RIG RX-2 Receiver
This page describes my modifications to the RIG RX-2 receiver which enable it to be controlled remotely from a computer, using an RS-232 serial interface. The modifications are in two parts: some simple additional hardware, and a new firmware program for the PIC16C84 microcontroller. In manual control mode, the modified receiver operates very much
Rf Remote Control Transmitter Circuit
PHONE RING REMOTE CONTROL
Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up. Circuit then performs desired control function. Any combination of rings can be used as long as
Remote control recetver
REMOTE TV VOLUME CONTROL
Ultrasonic bursts from handheld transmitter are picked up by microphone and fed to ujt threshold detector 2N2646 that also generates trigger pulse. Two cascaded bistable dividers control three transistors shunted across volume control, to give full volume (no shunting) and three lower volume levels. -J. H. Phelps, Transistors Instead of Relays Tune
MAGNETOSTRICTION TV REMOTE CONTROL
Frequency of transistor oscillator is controlled by either of two lengths of nickel tubing, each looting inside form having two coil windings. One coil acts as driver and the other as pickup to provide feedback voltage for sustaining oscillation at control frequencies of 38. 5 and 41. 5 kc. Aluminum diaphragms on front ends of tubing increase...
REMOTE CONTROL ANALYZER
A schematic diagram for the remote analyzer is shown. The circuit is powered from a simple 5-V supply, consisting of PL1, 51, T1, abridge rectifier (comprised of Dl through D4), capacitor C1, and a common 5-V regulator, UI. Switch 51 is the on/off control and is optional. The power-supply trans-former used in the prototype is a 12. 6-Vac unit, but
REMOTE CONTROL TRANSMIITER
This transmitter sends an FM signal in the 88-to 108-MHz range, with a tone of 19 kHz. This can be used to activate the FM MPX pilot carrier indicator, which can be interfaced to external devices. L4 is for use with a 15 CM wire antenna. L1 is 9 turns of #26 enamelled wire on a 1/4-W 10-k © resistor (carbon type), L2 is 2 turns wound over L1. L3 i
IR Remote Control Modulation Detector
A circuit to extract and measure the modulated carrier of an Infra Red remote control. Note that the circuit does not physically separate control pulses from modulation, but amplifies the completereceived signal allowing the waveform to be displayed ideally on an oscilloscope or a frequency counter. Modulation frequencies between 1kHz and several
Battery Powered Infrared Remote Control Extender
This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - so battery life is excellent. And by shutting down in the presence of extraneous IR radiation - it copes with the problem of excessive output current. This circuit is not powered directly from the battery. When a remote control signal
TV remote control Blocker Circuit Jammer using Ic 555 and IR Leds
Just point this small device at the TV and the remote gets jammed. The circuit is self explanatory. 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam. The transistor acts as a current source supplying roughly 25mA to the infra red LEDs. To increase...
Making a Remote Controlled Car using Sun SPOT
Here remote Sun SPOT will send data to Sun SPOT on car which will drive the IC according to DC IO pins D0 - D3. The IC will drive the Motors which will run the car. package org. sunspotworld. demo; import com. sun. spot. io. j2me. radiogram. Radiogram; import com. sun. spot. io. j2me. radiogram. RadiogramConnection; import com. sun. spot....
Stepper Motor Circuits
Direction Finder Circuits
Power Control 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