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
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Low-Voltage Remote Mains Switch
This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch. The mains appliance (in this case, a light bulb) is switched with a suitably-rated relay. All of the electronics is housed in an ABS box located in proximity to the appliance. The pushbutton switch and plugpack are located remotely
In this age of enlightenment any sort of relationship that could be described as master/slave would be questionable but for the purposes of this circuit it gives a good idea of how it functions. The circuit senses mains current supplied to a master` device and switches slave` equipment on or off. This feature is useful in a typical hi-fi or home c
RC (Remote Control) Switch
It is sometimes necessary for an RC (remote control) model to contain some kind of switching functionality. Some things that come to mind are lights on a model boat, or the folding away of the undercarriage of an aeroplane, etc. A standard solution employs a servo, which then actually operates the switch. Separate modules are also available, which
Remote Control Mains Switch
As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help. This time the request came from a friendly elderly lady in a retirement home. In her room the light switch by the door and the pull cord above the bed operate the light fitting on the ceiling in the middle of the room. How
USB Switch For Printers
This circuit switches a printer`s USB connection from a PC to a laptop. What was needed was a method of allowing a laptop to use the printer occasionally while at all other times the printer would be connected to the PC. Instead of unplugging the printer from the PC and then into the laptop, the circuit switches the USB connection automatically. K
THE TESLA SWITCH
We used as a starting point for our experiments, the switching device John Bedini had built for the Tesls Symposium. Our goal was to upgrade this switching device for ordinary car or motorcycle batteries..
Optimizing the Load-Switch Function of the DS2715 Battery-Charger IC
The DS2715 is a complete NiMH (Nickel Metal Hydride) smart-charger solution with load detection well suited to low-cost applications..
motor switch led circuit
The strategy is to get the circuit going in stages, testing each part as you go. Once everything is wired correctly and can be either controlled or read by the computer correctly, then you can write the main program with confidence that all the pieces are working. Follow the directions shown in the Arduino Guide ( PDF file ) under the "Flashing an
Push Button ON-OFF Soft Latch Circuits
This page provides soft power switch circuits for toggling electronic devices ON and OFF with a momentary button press that controls a latching high-side MOSFET power switch. Several micropower latching switch circuits are provided. Owing to their low current in the OFF state, they`re well suited to battery operated portable instruments. Feel free
Raspberry Pi ON/OFF Power Controller MOSFET Switch
It would be convenient to use momentary contact push button switch to turn ON and turn OFF your Raspberry Pi (RPi). A press of button should apply power to micro USB header, and keep it ON while Raspberry Pi initializes and starts its application..
Simple and clean DC to AC inverter remote switch on mod
Though I`d make a quick how to guide for a remote power on switch for a DC to AC inverter. Rational: -I want to be able to turn off and turn on my..
SIMPLE RF REMOTE SWITCH CIRCUIT
Captret and Tesla switch
It is a complex component to say the least. It is as if it is composed of 3 caps being 2 virtual plus the known cap itself. On my first graph I am showing the log of the progess of the running and sucessfull version shown on my youtube videos. Voltage is still going up andLED is a little bit more bright now. I also noticed that battery B1 is...
Battery Tesla Switch 720 Watt Mosfet Circuits
The circuit uses a total of six, 12 volt lead acid batteries to power the load. 3 batteries are wired in series to create 36 volts. The total discharge current is 30 Amps. 3 batteries are wired in parallel to create 12 volts The total charge current is 10 Amps per battery. 20 Amps are lost to the environment as heat or work done by the load....
6 Battery Tesla Switch Power Mosfet Uses No Schottky Power Diodes
If the total circuit resistance can be reduced significantly to less than 0. 1 Ohm & a load of 0. 4 Ohm or less is connected, over 1 Kilo Watt of free electrical energy can be obtained. There are two discrete voltage regulating stages, one is shown in the circuit below, while the other ones are shown in the mosfet gate drive circuits in part A &...
6 Battery Tesla Switch Circuit Mosfet Solid Stat
The South Africa company, which has developed the 5 kilowatt Fuel Free Generator, has discovered that the batteries` longevity is significantly effected by the process. As far as the choice of batteries to test is concerned, there are many different lead acid batteries, Gel Cells, Car Batteries, 2 volt batteries, 6 volt, 12 volt also NiMH or other
Four 4, 8 Volt 2000mA Nickel Cadmium batteries. Does anybody here know a safe way of initial charging those batteries from a lab power supply I do not have a NiCad charger so I need to make one. Any circuit drawings of a simple NiCad charger I will be glad to get some help on this. I have four 4, 8 Volt 2000mA Nickel Cadmium batteries. Does...
Simplest Solid State Tesla Switch
This circuit should be the easiest to tune as well (Reason: when the pulse is at 6V, all transistors should be open switch, so logically, there will never be battery shorts). The pulse voltage source V5 can be replaced by a 555 astable circuit. V6 can be obtained by using an equal voltage divider (two 5K resisters, for example) sharing the same...
Remote Control On/Off Switch
Installing a small dash mounted 2 speed fan in my motorhome. What`s the best way Use your 1 channel and then find a relay or use the 4 channel and use the seperate wires [1 low spd. &1 high spd ] Any other lideas Would it hurt the unit if it were placed in the engine compartment Thinking of the summer-heat (especially when engine is runnin
The Q-Switch driver for an old Yag laser died. A replacement was >$1000 so we built our own for = 20W into a 50 ohm load at 68MHz. The rep rate had to be adjustable between 100Hz and 100KHz and have a TTL output to synchronize the output with other equipment. I had never made a RF amplifier befo
Ac Switch Triggering Circuit Using An Optical Triac
ultrasonic switch circuit
The circuit described generates (transmits) ultrasonic sound of frequency between 40 and 50 kHz. As with any other remote control system this cirucit comprises of a mini transmitter and a receiver circuit. Transmitter generates ultrasonic sound and the receiver senses ultrasonic sound from the transmitter and switches on a relay. The ultrasonic tr
Float Switch Water Level Measurement
A Float Switch is a device which is typically used to measure the depth/level of liquid in a container. As the water rises and reaches the level of the float switch, it begins to float going from the vertical to the horizontal. This closes an internal switch which can then be used to turn on/off a pump, alarm, relay. Pictured above is a submersi
AMP Hexadecimal Rotary Switch
Pictures and a sample schematic (including pinouts) of an AMP hexadecimal (16-position) switch with screw slot actuator..
RPM switch for 6th ports or VDI
A circuit diagram for an adjustable rpm switch. It ’s something you can use to activate solenoids for auxiliary ports, VDI, shift light, or anything else you can think of. The circuit is adapted from a rev-limiter circuit for rotaries. In particular, I ’d like to thank Rob Weinstock from the fc3s. org list for his help tweaking it.
Design of a wideband multi-standard antenna switch for wireless communication devices
The proximity switch circuit with integrated magnetic field sensor HMC1001
As shown in figure, the proximity switch circuit is composed of HMC1001, operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator. When you move magnet with length being 6mm~12mm to HMC1001 in a predetermined position, the output voltage of MR bridge will reach 30mV, then the comparator...
series connection switch circuit
Light emitted by Xenon flash tube is transmitted to phototransistor MRD300 through optical fiber. Sensitive current is amplified to triggering a string of thyristors simultaneously. Therefore, high voltage of 6000V is set on loader R. This optical trigger flip-flop can eliminate the inductance delay of general wirings. Here, the SCR devices are...
AC power control photocell memory switch circuit
We can use the flash beam to supply the remote control for the AC power devices. The important point of this device is the memory function. It can continuously supply the power to the device. When it acts the second time, the power will be cut off continuously. It is composed of a high sensitivity photocell, a high-gain integrated circuit...
Motion Sensor Switch for alarm light or water sprinkler
The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginning the construction contact your nearest electronics component vendor and procure a readymade box-type Passive Infrared (PIR) Motion Sensor unit. Such units, packed in a compact enclosure with...
SPEED CONTROL SWITCH
BASIC ZERO CROSSING SWITCH CIRCUIT
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