Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
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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
New Circuits Page 10
interfacing large load bank with
This project is output port expander of microcontroller 8051. In this project we will learn, how to interface a large load bank with microcontroller 8051. In this load bank project, up to 50 solid state relays are interfaced with microcontroller using shift register 74LS4094 TTL IC, student can use CD4094 CMOS IC, any of them will work here fine.
The control circuit of two-phase servo motor
Two-phase servo motor has the field winding and control winding, when the phase difference is 90°, it generates the rotation torque. The potentiometer connected to the motor shaft will get the voltage difference between the corresponding voltage and target value detected by potentiometer, and voltage difference is used as the error voltage,...
TB6556FG 3-Phase Full-Wave Sine-Wave PWM Brushless Motor Controller
The TBA120U is an i. f. Amplifier with a symmetrical FM Demodulator and an a. f. Amplifier with adjustable output voltage. The a. f. Amplifier is also provided with an output for Volume Control and an input for VCR operation. The input and output of the TBA120U are especially designed for LC-circuits, but the input CAN also be used with a...
Mains Supply Failure Alarm
Whenever AC mains supply fails, this circuit alerts you by sounding an alarm. It also provides a backup light to help you find your way to the torch or th..
circuit satellite receiver
The Dish Network 322 Satellite Receiver accommodates television viewing of two different programs in two different locations. This is a schematic block diagram of an exemplary circuit logic diagram. The receiver can predict the elevation angle of each Schematic Block Diagram circuit Satellite Receiver
10 MHz to 1 GHz Oscillator
Nowadays, it is no longer necessary to use discrete components to build oscillators. Instead, many manufacturers provide ready-made voltage-controlled osci..
step down converter controller
The TPS6420x controller is designed to operate from one to three series-connected cells or from a 3.3 V or 5 V supply obtained from a USB port. At its output it can produce 3.3 V at 2 A, suitable for powering a microcontroller-based system. With a suitable choice of external components (inductor, P-channel MOSFET and Schottky diode) the device...
ir remote control home appliance
This is the most popular IR Remote control circuit for home appliances like lamp, fan, radio, tv etc to make the appliance turn on/off from a TV, VCD or DVD remote control. It is very simple to build because of few components and simple design. The circuit can activated from up to 10 metres. The 38kHz infrared (IR) rays generated by the remote con
LED Drivers/LCD Bias
I have a circuit (see attached) provided by an LCD manufacturer that illustrates using the POL signal from the display to derive the VCOM signal. From what i`ve read, LCD Bias ICs generate VCOM from the high bias voltage. Is it possible to instead feed the POL signal into one of these ICs to generate the VCOM signal Is there a version of these IC
In crystal oscillators, the usual electrical resonant circuit is replaced by a mechanically vi brating crystal. The crystal (usually quartz) has a high degree of stability in holding con stant at whatever frequency the crystal is originally cut to operate. The crystal oscillators are, therefore, used whenever great stability is needed, for examp
Siren circuit with 556 timer
This intercom box takes input from any 2-way radio (FRS, GMRS, etc), cell phone, and a stereo audio source and amplifies them for listening via a headset in your helmet. The headset is a modified Chatterbox stereo headset. The standard Chatterbox mic is removed and replaced with a noise-cancelling mic with a high density windsock.
For one thing the Krohn-Hite 5100A VCO takes Zero to -17 VDC to drive the VCO output frequency. But the O-Scope X-axis wants 0 to +5. 7 volts to have the X-axis represent increasing frequency to the right. So, the O-Scope frame had to float to get -Volts into the KH 5100A and use same signal to get +Volts into the O-scope. Too confusing for a quick
servo motor tester circuit
Here is the program to control simple servo motor in both direction. I test it today and think that i should also share it with you people so that you can also enjoy and can takebenefit. This program will rotate servo motor in both clock wise and anti clock wise direction you can modify it according to your requirement and according to your wish a
12W Audio Amplifier Circuit with TDA2006
The power amplifier IC TDA2006 provides high output current and has very low harmonic and cross-over distortion. Further the device incorporates anoriginal (and patented)short circuit protection system comprising an arrangement for automatically limiting the dissipated power so as to keep the working point of the output transistors within their sa
wien bridge oscillator
Wien bridge oscillator. A phase-shift feedback oscillator that uses a Wien bridge as the..
Analog IO Protection
The I/O Filter Wildcard provides a convenient place for prototyping analog circuitry or for filtering, conditioning or protecting the I/O lines of other Wildcards. Twenty-four I/O lines can be independently filtered, or their signals can be combined in custom ways. When connecting external signals for data acquisition, you should always filter yo
diy tube buffered passive preamp
By sufficiently lowering output impedence of a circuit and supplying enough current to drive cables, it does not suffer the same problems as passive designs. As such, it seems to solve the many of the problems inherent in both active and passive preamps without causing too many additional problems of is own. The problem that I encountered in...
schematic 1 3 volt power source
This circuit is a circuit diagram of resource replacement 1. 3V mercury cells or other small batteries. This has many uses and you can use this circuit in the computer to turn on a front panel multi adapter which has a digital thermometer. This circuit took power from the PC. Power connector cable has a color code, red and black is 12V supply, blac
Bootstrap Buffer Based Preamp
I have been playing with a number of variations of the circuit as a free standing preamp, headphone amp, 321/729 replacements and as a potential active crossover, any and all of which may happen if there is demand. There has been strong interest in all of the threads and my bootstrap buffer preamp is up and running nicely - and for the moment it`s
Optical transmission detection circuit
In this circuit, phototransistor and four operational amplifier take the action of total energy detector, to detect the total energy of pulse optical transported by the optical cable communication system. If the light intensity of singal source remains the same, then this circuit can be used to test and compare the situation of optical fiber, it...
Infrared Remote Tester
A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will flash when any of the Remote-Control push buttons will be pressed. The side of the Remote-C
Regulated Dual Power Supply Circuit Using Regulator IC
The circuit is use to regulation dual power supply that provides +12V and -12V from the AC mains. A power supply like this is a very essential tool on the work bench of an electronic hobbyist. This is the figure of the schematic of the circuit. This circuit is built by LM7812 and LM7912 for the voltage regulator IC. The transformer T1 steps down t
15W Inverter Circuit 12VDC to 120VAC
This is the schematic diagram of 15W inverter circuit. The circuit is based PNP power transistor such us TIP32 and other similar transistors. This inverter is producing square wave, there may be some noticeable hum on audio units which powered using this inverter circuit. To reduce some of the hum, you may increase the value of the output capacito
Pump Controller For Solar Hot Water System
This circuit optimises the operation of a solar hot water system. When the water in the solar collector is hotter than the storage tank, the pump runs. The circuit comprises two LM335Z temperature sensors, a comparator and Mosfet. Sensor 1 connects to the solar collector panel while Sensor 2 connects to the hot water panel. Each sensor includes a
MSP430 Ultra-Low Power 16-bit Microcontroller
As found in SLAA458, the revised pulseoximeter application, I`ve attached an image of the USB schematic that is used to output collected data. I just had a few questions about this schematic. 1) What do J3 and J6 correspond to I can see the corresponding node names on the Ft232BM chip on J3, but these two are not present in any other schematic of
LED 12 Volt Lead Acid Battery Meter circuit
In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LEDs will illuminate...
flipflop Purpose of the logic gate configurations on the Kenbak-1
What that flip-flop does, but mostly why those two NAND gates aren`t just inverters. and why the one on the bottom (and the inverter next to it) are even there. You should wait with accepting the answer and allow others to have a look and write up their theory. An answered question will attract less visitors. It is good practice to wait with...
LCD Liquid Crystal Display
An LCD basically consists of two glass plates with some liquid crystal material between them. The LCD has an electrically controlled light polarising liqui..
Understanding FM transmitter circuit
Wireless FM Transmitter. The site has some explanation on how the circuit works, however I`m not sure about a few things, including the electret mic & how the frequency modulation takes place. The electret microphone has a current of 200uA which changes by +- 3 uA depending on sound waves. This sets the voltage across R1 to 2V and the voltage acro
Ringing Phone Light Flasher Circuit
How to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit came from
mobile phone charger circuit diagram
wpmp switche mobile
Stepper Motor Interface to Microcontroller
As you see in the circuit above the four pins "Controller pin 1", 2, 3 and 4 will control the motion and direction of the stepper motor according to the step sequece programmed in the controller. As already discussed in case of L293D, Here in this circuit too the four pins "Controller pin 1", 2, 3 and 4 will control the motion and direction of...
3v fm transmitter for short distance
The important part of the circuit is formed of the Colpitts type oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and dual gate MOSFET are active parts in the oscillator. When the input impedance of the MOSFET gate inputs are high, LC tank is not affected. However transistors force the LC tank and cause phase shift. Two...
There are systems in which it is imperative that the supply voltage of, say, a motor, always has the correct polarity. It is, of course, possible to use a bridge rectifier for this, but if large currents are involved, this is not always possible. This may be because large voltage drops across diodes result in appreciable heat dissipation, or that
High-Voltage Regulator With Short Circuit Protection
There are many circuits for low voltage regulators. For higher voltages, such as supplies for valve circuits, the situation is different. That s why we de..
PA100 DIY 2x LM3886 in parallel gainclone audio amplifier
simple lamp dimmer 220v using triac
A very simple dimmer circuit with only the essentials. (In this circuit, the values are given for a BT138 at 220V AC, for 115V AC you may have to experiment with the values. ) R1 can vary from one triac to another, put a 220K © trimmer in its place and adjust. After adjustment, measure the result and replace the trimmer with an ordinary resistor of
Two Flashing LEDs Circuit
Here is the circuit diagram of Two Flashing LED`s for different applications (such as model construction), and recreational. Having adjustable flashing speed with two potentiometers. It is the collection of a few active and passive components. This circuit is very easy to built ( a good idea for beginners ) and can be build on a general purpose...
adc Voltage Fluctuations in Arduino-opamp-thermistor circuit
ir remote extender circuit
This IR remote extender can increase the range of most simple IR remotes (those operating on a 40KHz modulation) a significant distance. In use, the remote is pointed toward the detector on the circuit, and a button is pressed. The Sharp IR detector then decodes the 40KHz modulated signal into a series of pulses, which trigger a 555 timer. The 555
Super Sequencer?® With Margining Control And Auxiliary ADC Inputs
The ADRF6702 TxMod is an IQ Modulator with integrated PLL and VCO The PLL Synthesizer uses a Fractional-N PLL to generate a 2*FLO input to the I-Q Modulator The PLL reference input is supported from 12MHz to 160MHz. The phase detector output controls a chargepump whose output is integrated in an off-chip loop-filter. The loop Filter output is then
VU Meter Driver PCB Completed Board Stereo for 110898091550
VU Meter Driver PCB Completed Board Stereo for Two VU Meters Audio Amplifier. VU Meter Driver PCB Completed TA7318P Board Stereo for Two VU Meters Features : Specifications:Power voltage: AC 20V to AC 26V(not more than 26V)size : 52 x 67 x 32mmIt can connect two VU meters (100?A to 500?A). You dont neet to adjust for our VU meter 500?A. Others...
IR (infrared) receiver and transmitter
Hello all, Recently I acquired some samples of IR LED`s, and a matching IR Phototransistor. I was bored, and decided to make something with it!..
ISL8107 Single-Phase Pulse-Width Modulation (PWM) Controller with Wide (9V-75V) V
The ISL8107 is a single phase, non-synchronous buck controller with an integrated high-side MOSFET driver. The controller operates from 9V to 75V input voltage range. The internal 1. 192V reference voltage has a tolerance of ±1% over the industrial temperature range. The ISL8107 employs voltage-mode control with feedforward compensation to provide
Oscilloscope testing module (huntron circuit)
Application Of Uart In Gps Navigation System
The APX9132 integrated circuit, is an ultra-sensitive, pole independent Hall-effect Switch with a latched digital output. A 2. 5 volt to 3. 5 volt operation and a unique clock- ing scheme reduce the average operating power requirements, either a north or south pole of sufficient flux will turn the output on; in the absence of a magnetic field,...
simple fm walkie talkie 11
RF Signal Attenuator up to 30dB for 1MHz - 500MHz Input
This is a PIN diode based RF signal attenuator circuit operates with 1MHz 500MHz input. PIN diodes are one of the most common parts used in RF applicati..
Metal Detectors and Sensors Circuits
dag gerboard position detector
wein bridge oscillator
hello, i am doing a practical on lm 741. i want to make it to use it as an wein bridge oscillator.the value of c1=c2=0.01uF, R1=R2=3K, Rf=2k, Ra=1k.acc..
51 one-chip computer ADC0804 analog to digital converter studies
It is ADC0804 to be left-handed, it is 74HC573 latch to be right hand, the latch connected the one-chip computer and has not drawn at the same time. The pin CSAD of ADC0804 is a chip selection pin because acted as effectively by the low level Hand over 0 hour, we can choose it to work. RD is that the low level is effective too, it is the read sign
Automatic Loudness Control
Simple add-on module, Switchable â€œControl-flatâ€ option In order to obtain a good audio reproduction at different listening levels, a different tone-contro..
ac switch control with opto triac
Tube in a Tube Clock
The clock described on this page is the result of both events, a simple single digit nixie clock with some interesting features, but without any difficult components. This clock first of all demonstrates that it is possible to use standard, low-voltage, general puspose, small-signal transistors like the BC550, as nixie drivers. Since I can...
delay circuit for surround sound
This circuit in below uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay settings is not easily obtained, and would add considerably to the complexity of the circuit. This is the figure of th
and the most likely problem with my wiring is ME. My apologies for the long post but I thought the more information and pictures I can provide the..
MOSFET short-circuit protection Schematic Diagram
If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of current flowing through the MOSFET. The voltage across the internal resistance can be sens
5 Band Graphic Equalizer Circuit
This circuit is for graphic equalizer that can build with low components count and control using LA3600 single IC chip. The internal design of the chip uses transistors gyrator circuit, with connections to external capacitors to set the response. This is the figure of the circuit. Sorry, this picture is not clear. This graphic equalizer circuit is
homebrew rf circuit design
This time on we Will Share About Yo3dac Homebrew Rf Circuit Design Ideas Latest Info at Onmilwiki..
A Unipolar Stepper Motor Drive Using The Z8 Encore! ?® Mcu
NEC`s UPB1008K is a Silicon RFIC especially designed for handheld low power/low cost GPs receivers. The IC com- bines an LNA followed by a double-conversion RF/IF downconverter block and a PLL Frequency Synthesizer on one chip. The second IF Freqency is a pseudo- baseband signal into a on-chip 2-bit A/D converters The device CAN operate on a suppl
control circuit for nokia tv tuner 5827
The tuner is programmable via I ²C-Bus and provides a FBAS signal at its output. There is also the homepage of Georg Acher containing information about this tuner. I have developed a control circuit for this tuner which uses the AT89C2051 from Atmel. Operating is done via three keys: key C/P switches between the program number and the channel...
KWM-2 and KWM-2 Transceivers
One spark gap (in a first version these were just copper wires bent into a ring at the end to suppress corona, the current design is somewhat more sophisticated and uses spherical electrodes), It produces a 300kV output pulse with a discharge energy of 36 Joule. The discharge path is more than 40cm long and produces a loud bang - enough to make...
building vu meter
Need to amplify the output of the iPod`s headphone jack would not be enough to provide the chip with a large enough signal to respond to, but this was because I had been researching three different chips. The LM3914 is a linearly calibrated device, so its output will change one-per-volt of the input. This could be a problem for low-voltage...
Usb-powered Dsl Modem Supply
12KV High Voltage Generator
The hobby circuit below uses an unusual method to generate about 12, 000 volts with about 5uA of current. Two SCRs form two pulse generator circuits. The two SCRs discharge a 0. 047uF a 400v capacitor through a xenon lamp trigger coil at 120 times a second. The high voltage pulses produced at the secondary of the trigger coil are rectified using...
Two Basic Motor Speed Controllers
Here are two simple 12V DC motor speed controllers that can be built for just a few dollars. They exploit the fact that the rotational speed of a DC motor..
Passive tone control circuit
The Passive tone control circuit be the circuit fines the bass that has no the expansion but will give kind equipment R and C. It perform filter frequency then the circuit that build easy and must not use power supply. By can concede the porch with part power amplifier of output immediately. When feed input come in sound signal will that come in t
12 volt power supply circuit using LTM4096 IC
A very simple high efficiency switching mode buckboost power supply circuit can be designed using the LTM4609 switching regulator IC. This switching power supply circuit will provide an fixed output voltage of 12 volt. As you can see in the schematic circuit, this switching power supply circuit require few external electronic components. LTM46
Door Ajar Alarm Circuit
Ever accidentally left your front door ajar and had a pet escape Here is a smart solution to this problem. The circuit is fairly simple but a great example of using a tiny circuit to get the job done. All you need is a CD4011 IC plus a handful of components. In this door ajar alarm/beeper circuit, a bar magnet-reed switch combination is used as t
12 Volt 30 Amp Power Supply
Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps..
Squarer circuit is used to shape signal, to get more defined square wave. This circuit is useful to make convert the signal so it has very fast rise time. Here..
practical guide to free energy devices
Voltage Controlled PWM Generator
Circuits that generates PWM pulses. Most of them will translate a resistor value into duty cycle change. Although that is handy and easy, sometimes a voltage controlled PWM generator is needed. There are of course those micro-controllers that could make almost any kind of PWM signal translation, but i preferred to study and create a circuit...
A 2.3GHz receiver converter for the Yaesu FT817 allmode transceiver
single 813 G2DAF RF amplifier
This project shows how to create an MB Electronics Simon game clone using an 8-pin PIC12F683 microcontroller. The game includes a full emulation of the original Simon `game 1` and the ability to select from 4 skill levels which control the number of colours you must repeat in a sequence in order to win the game. The project was created for Sparkfu