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
New Circuits Page 7
U-110 1.5 Mhz Current Mode Ic Controlled 50-watt Power Supply
The U2745B is a PLL transmitter IC which has been especially developed for the demands of RF low-cost data transmission systems at data rates up to 20 kBaud. The transmitting frequency range is 310 MHz to 440 MHz. It CAN be used in ASK sys- tems. The main applications of the U2745B are in the areas of outside temperature metering, socket control,
Ultrasonic Sensor Switch
This is a ultrasonic motion detector (or movement detector) circuit. The circuit claimed has a high movement sensitivity. Even air moving (hot air rising, wind blowing) will trigger it when the trimpot is set near the most sensitive position. The transmitter sends out a steady ultrasonic tone at 40kHz. At this frequency the wavelength is. This is
Surfmaster PI Metal Detector Schematic Diagram
If TIP32C (Q2) gets excessively hot, use an IRF9640 MOSFET instead. Experiment with different values for R6 to find the optimal value (I use a 390 ohm resistor). Temporarily substitute R6 for a trim potentiometer (470 or 1k) to find the optimal dumping resistor for your coil.
Circuit From the Past
A Code Practice Oscillator and that I must have built it some time ago. I had a vague recollection of the project. It certainly looked like something I might have built. There was a straight key in the same box that plugged right into the key jack. I opened the inside and found this circuit board populated with through-hole parts. Replacing the...
power supply circuit diagram
This circuit, using a minimum amount of parts generates a 10Hz sine wave [based on the component values shown]. The active components are generic devices and may be substituted as required. The passive component values set the frequency and should only be changed if a different frequency is desired. The component out lines or package styles are co
Low cost Mic Mixer
This is the schematics of a low cost mic mixer that can be assembled from the components in your junk box. This two channel mike mixer is designed for handling high impedance dynamic microphones. Transistor Q1 can be any general purpose pnp transistor like BC177 or BC157B. Resistor R5 biases the transistor while R3 and R4 provides channel...
Low level AM Transmitter Circuit and little description
@ goldsmith If you need a complete circuit , i have thousands of these circuits in my designs . i can give you some of them easily , but you have told ..
Toyota 4Runner Wiring Diagram 2004
INA159 Dual-Polarity Bidirectional Current-Shunt-Monitor Circuit
This is a INA159 Dual-Polarity, Bidirectional Current-Shunt-Monitor Circuit. This circuit uses OPA340 because it has near rail-to-rail input and output swing..
74HC240 produces and seeks all robot
This text give reader it introduces another that Is produces to be central to seek the smooth robot as top management by 74HC240, still carry out low technology, low-cost making idea, enjoy together with everybody. The threshold voltage of the Schmitt trigger has determined the set value of the system, the characteristic of the Schmitt trigger has
Low impedance microphone amplifiers
The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don`t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7.
crazy ideas irrational projects
GSM Remote Control 2 IN and 2 OUT DTMF
h5. Introduction In this post we present the last application created from the development of the modular remote control we started describing in the issue of April..
Selective hydrogen detection at high temperature metal-oxide-based sensing electrodes
SA608 SA608 Low Voltage High Performance Mixer FM IF System
SA9614 is a RF Amplifier used for signal conversion and auto laser power control (ALPC) between the CD optical pickup head and decoding chip. SA9614 includes Interface of CD optical Diode RF signal Amplifier and equalizer, VREF generation circuit, Automatic optical power switching circuit (it suits for CD-A/V, CD-R, CD-R/W, CD-ROM). By Silan
Quartz Crystal Clock
All of our electronic circuits were originally constructed on breadboards. Once the circuits were working, we soldered them on perfboards to give us a more robust system. We created a power board which stacked two batteries in series. This gave us access to a 14. 4V line and a 7. 2V line. We separated our high power electronics from all of our...
Mains operated LED lamp
Car subwoofer filter
Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between 60 to 160 Hz. The circuit is designed around the TL072 dual BIFET opamp IC. Out of the two
simple accu charger circuit
The Accu charger circuit is very simple and easy to make, because it only requires a few components are also not more than 10 components. Besides easy charger circuit is also very cheap and very efficient. This circuit requires power supply from a transformer that comes from an AC voltage 220 and diuturunkan be 12-13 volts and then enter...
Coin Counter circuit
The next counter section works the same way but is set up to count 4 quarters, single $1 (loonies) and single $2 (toonies). The toonies circuit is set..
Model And Remote Control Schematics Electronics Circuits And
Sega Saturn controller to USB adapter
This projects makes it possible to use Sega Saturn peripherals (controllers, mouse) on a PC through an USB port. Using the schematic and firmware available on this page, one can make an adapter (Using the connector from a Saturn extension) or convert a controller (if it has enough internal free space). Thanks to USB HID compliance, the adapter wor
LA2010 Audio Level Sensor
The LA3361 PLL FM multiplex stereo Demodulator is designed for low supply voltage-use appliance such as por- table Radio or car stereo. By Sanyo Semiconductor Corporation
Dodge Durango Fog Light Wiring Diagram
Dodge Durango Fog Light Wiring Diagram.
7W Audio Amplifier circuit with LM383
PICmicro Processor Unit version 2
Audio Signal Generator
A couple of cheap CMOS ICs are used to digitally generate audio sinewaves across a wide range in this compact battery-powered test instrument. The oscillator features both unbalanced and balanced outputs. I use signal generators of one sort or another all the time as I design and build circuits. They include a pair of simple oscillators; a transis
4bit alphanumeric LCD interface 8051
using only total of 7 pins from your microcontrollers GPIO. So LCD module will cost only single port out of fours. >> The EN line is called "Enable. " This control line indicates to the LCD that we are sending it data. To send data to the LCD, the EN should be low (0) and then set the other two control lines and/or put data on the data bus. When...
Digital Radar Speedometer Circuit
This circuit is use to Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser reflection. It sends laser radiation to the object and this object reflects the laser radi
FREE SCHEMATIC FOR PIC16F877A
Voltage Multiplier diagram
SOLID STATE TESLA COIL
A TV flyback transformer can double as a low-power Tesla coil. The Tesla circuit consists of a pulse generator, a driver circuit, and a high-voltage transformer. Resistors R1 and R2 determine the time duration that the output at pin 3 is off, while R3 and R4 along with R1 and R2 determine the ON time. Inductor L1 and regulator IC2 provide a clean,
TIMER IS AUTOPATCH KEYER
Frequency change produced in Colpitts oscillator by metal object near tank coil is indicated by 565 PLL connected asfrequency meter. Oscillator frequency increases when search coil is brought near nonferrous metal object. Oscillator frequency decreases, as indicated by lower meter reading, when coil is brought nearferrous object. Signetics Analo
The circuit diagram of the Lie Detector is shown above. It consists of three transistors (TR1 to TR3), a capacitor (C1), tw1o lights or LEDs (L1 & L2), five resistors (R1 to R5), and a variable resistor (VR1). This circuit is based on the fact that a person`s skin resistance changes when they sweat (sweating because they`re lying). Dry skin has a
led rf signal meter
This RF Wave Absorbion meter will detect signals between 10cms and 10m away all acording to the setting of the 22MegOhm gain adjustment potentialometer and the power of the transmitter. The RF signal is detected across the germamium OA91 doides and rectified to a d. c. level driving a 10LED driver IC. The LED`s are marked 1 to 10 indicating the...
There are several sections in this website that you should read regarding track wiring. This section on track wiring, Part I, covers general wiring information, testing, and troubleshooting. Part II contains the actual wiring of track. The menu to the right will automatically take you to the right section. Connecting your track to your booster is
An B3CKS beer can VLF Antenna
So there is a chance to use them in combination with a condenser microphone amplifier for a VLF Receiver. Bingo. The first tests as a Monopole gave good results. I live in a small town located at J041VG with approximately 7500 inhabitants. The height above sea level is between 220-650 m over NN. My QTH is in the middle of town and 330 m over NN.
15 volt 1 Amp regulated power supply circuit
White led driver
After I smashed about 5 mobile phones and collected some white LEDs, I decided to build some some LED searchlight. There are two ways to solve this problem: first, Chinese version, just connect some white LED`s to battery and use some ballast resistor. And watch you spotlight fading while the battery is loosing it`s power. Ante the second, hi-tech
Hi-fi AM detector
A modification to David Knight`s linear detector circuit. I wanted to build a "hi-fidelity" AM receiver and needed an ultra-linear AM detector for it. Here is the circuit I came up with: Note that I eliminated the meter circuit, and removed a lot of the bypass caps. I now have a circuit that has a finite quiescent current at the output te
Fuzz Box Distortion Pedal Guitar Effect
This guitar effect circuit uses a simple high gain amplification, followed by a symmetric clipping using parallel diodes clipper. The gain of the 741 op-amp..
SHURE Model M62 Simple Audio Level Controller Circuit Design
SHURE is an American corporation produces consumer and professional audio-electronics manufacturer of microphones, phonograph cartridges, discussion systems,..
SYNCHRONOUS FILTER FOR ADF
Separates 130-cps motor drive voltage from voice frequencies in output of adf receiver-P. V. Sparks, Servo Filter and Gain Control Improve Automatic Direction Finder, Electronics, 34:23, p 110-113..
Tickler oscillator circuit
When the circuit is first powered up, neither transistor will be switched on. However, this means that at this stage they will both have high base voltages and therefore a tendency to switch on, and inevitable slight asymmetries will mean that one of the transistors is first to switch on. This will quickly put the circuit into one of the above sta
This is not just another dimmer circuit. The improved design of this dimmer circuit enables its triac to be triggered with lower voltage values. Normally, the triggering voltage of a triac is around 70V. In some applications though, it is desirable to use a lower voltage in triggering the triac. A trick is used to achieve this effect in this circu
Please help with ultrasonic animal repeller circuit
HI FRIENDS, I HAVE A ANIMAL REPELLER CIRCUIT CIRCUIT DIAGRAM AS SHOWN: I HAVE WRKED ON THIS BUT NOT WORKING AS PREFERRED CAN U PLEASE CHECK THIS ONE..
tuned sine wave oscillator circuit
This is a design circuit for sine wave oscillators that will provide both a sine and square wave output for frequencies from below 20 Hz to above 20 KHz. The frequency of oscillation is easily tuned by varying a single resistor. This circuit is controlled by two op amp, LM111 and LM101A. This is the figure of the circuit. In this circuit, an opera
The National Semiconductor`s Overture series of integrated circuit (IC) audio amplifiers owes its rise to `fame and glory` to a relatively big success of the 47 Laboratory`s Gaincard amplifier, based on the LM3875 chip from the National Semiconductor. Due to the simplicity of the Gaincard design and construction, availability of (inexpensive) part
Automatic night light circuit
Experimenting with `gainclone` amplifiers. Gainclone amplifiers use opamps instead of the tubes and transistors that can be found in most amplifiers. I now present the second reincarnation of the Chill-amp concept. My interest in trying something with opamps was born when I saw the raving reviews of the Gainc
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
Links to VW & Audio Stuff
After building my Z-match tuner, I wanted to design a circuit board for a Stockton type swr/pwr meter that I could reproduce easily and see how small I could make it. The result is in the above picture. It is a board that measures a scant 1" x 1. 5" and is made from common single sided copper clad board. I drew the lines on the board with a pencil,
Sometimes the need arises for a simple, gated, pulsed alarm. The circuit shown here employs just four components and a piezo sounder and is unlikely to be out-done for simplicity. While it does not offer the most powerful output, it is likely to be adequate for many applications. A dual CMOS timer IC type 7556 is used for the purpose, with each of
Stanley Meyer Explained
You are right - this was what i was talking about in my description of EM fields in the WFC - the principle is the same, the only differance..
Monolithic/Hybrid Digital to Analog Converters using MC 1408ICSE/NE 5018
Monolithic/Hybrid Digital to Analog Converters using MC 1408IC,SE/NE 5018, Specifications and Applications..
All Lights Go Out When Brakes Lights Should Be On
had to rewire a boat trailer due to damaged wiring and lights. I`m using a standard 4 pole flat connection to my truck. The trailer is simple - two rear lights and nbo side markers. Both rear lights are grounded to the harness to the truck. Almost everything works fine. Turn on the headlights and the trailer lights are both on. Both
lamp flasher using ic lm395
This circuit of powerful flashing lamp is good use in vehicles. The LM395 IC based on circuit also known as super-transistor, which is terribly powerful integrated monolithic power transistor with options such as thermal protection, current limit etc. In fact, this circuit is almost indestructible. The IC will handle currents up to 1A 40V and switc
mic mixer circuits
The mixer circuit below has 2 line inputs and 2 mic inputs, 2 line outputs. The mic inputs are suitable for low impedance 200-1000R dynamic, simple mixer was designed for three dynamic microphones.
Soft-Action Mute Switch
This simple circuit is a line-level audio signal muting switch based on a soft-action power on/off process. When the S1 switch is closed, R4, C1 and Q4 JF..
Lessons on Electric Circuits Experiments
Digital circuits are circuits dealing with signals restricted to the extreme limits of zero and some full amount. This stands in contrast to analog circuits, in which signals are free to vary continuously between the limits imposed by power supply voltage and circuit resistances. These circuits find use in "true/false" logical operations and digit
stereo tube power amplifier schematic
Hand Clap Lamp control
Animatronic Neck Circuit
planning build mosfet h bridge motor control
At 9 volts the maximum stalled current of the motor types I`m going to use will be 700 mA. Since I`m not real experienced with this I want to check that I`m choosing good mosfets, I`m pretty clear on the rating, they say what current and voltage they can handle. But I`ve found with some the mosfets, particularly P type, the RDS (on) is fairly...
This is vWalker v1. The "v" standing for V, as in five. It is a five motor walker that goes towards light and avoids obstacles. The goal was to create a walker that could navigate over rough complex terrain while seeking out the brightest source of light. The base controller for the walker is four master/slave linked bicores. All of the other circ
DC fan control circuit for power amplifier Schematic Diagram
DC fan control circuit for power amplifier. Variable speed DC fan This series of works based on the input signal. Speed / fan rotation depending on size of the input signal coming from speaker lines. If there is no signal then the fan will spin slowly according to the setting VR1. Input supply can be taken directly from the main transformer power
How the circuit works is simple when you send a DTMF tone to the decoder the value of pin 15 goes high for a short time this makes an excellent trigger as it supplies a few volts to pin 2 of the 555 Timer this triggers the circuit and turned the relay on for a short time. If you want different times you can experiment with R1 use a Potentiometer...
LT1684CN Micropower Ring Tone Generator
Simple Combination Lock
This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circuit shows strapping for a 4-digit code, in this case "2057". Any unused switches are strapped to ground. When power is applied, the 330nF capacitor connected to pin 1 of inverter IC1a is discharged
Implementation of Direct Output Buffers
A total of six buffer circuits (using three dual op-amp packages), five for the input channels and one for the master output channel. (2) High input impedance (particularly for the five buffers tapping channel faders). (3) Low output impedance (<600 ohm), and stability when driving shielded cables of moderate length. (4) Use of op amps with low...
ua 741 square wave generator
A square wave generator with IC UA741 range shown here. The circuit uses positive feedback to the Schmitt trigger action and negative feedback to measure the time of the waveform. Let us assume that the output is high and the capacitor C1 is fully discharged. C1 now begins to charge through R2 and C1 R1. When tension rises above the junction of...
BiQuad Filter Circuit Diagram using LM3403 Quad Op Amp
This LM3403 op amp family including LM3303 known to be a monolithic quad op amp which have high gain, a compensated internal frequency that will assure a wide range of voltages can be operated from both single and/or dual power supply. The circuit diagram shown Bi Quad Filter using LM3403 Quad Op Amp. As you can see, it uses example that fo=1000Hz
ultra broadband buffer amplifier
Hello, I have a 3KHz-50MHz signal generator and I would like to amplify it`s 2.3mw output to +7dbm. I am looking for a broadband amplifier that can do ..
Did You Buffer The Buffered Buffer
Cypress` Dave Van Ess cautions circuit designers about the sloppy overuse of op amps with examples and circuit theory