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 19
555 Tone Generator Circuit (8 ohm speaker)
This is a basic 555 squarewave oscillator used to produce a 1 Khz tone from an 8 ohm speaker. In the circuit on the left, the speaker is isolated from the oscillator by the NPN medium power transistor which also provides more current than can be obtained directly from the 555 (limit = 200 mA). A small capacitor is used at the transistor base to sl
16w bridge amplifier using lm383
The afterward diagram is 16W Bridge audio amplifier circuit. The ambit congenital based 2 pieces of ability IC LM383 in arch connection, so this amplifier is an arch amplifier. This is an old amplifier, LM383 is discontinued, so this LM383 ability be difficult to find. You can use ECG1232, TDA2002 or TDA2003 as the alter for LM383. Take a agenda t
1986-on Lighting all models Ford Escort
Spark Transmitter Circuit
In 1896, Marconi successfully covered a distance of about 3 km using electromagnetic waves. A little later, he established radio contact across water between Lavernock Point, South Wales and Flat Holm Island. The transmitter consisted of a spark inductor coupled to a dipole antenna. At the receiver side, he used another dipole and a glass tube...
I have a 315bl excavator. Engine intermittently shut off on
A 315bl excavator. Engine intermittently shut off on its own, but will start back up without a problem. Now machine will not shut off when key is off, happens every day now. I sometimes have to choke off air intake to shut down. most of the time the engine will restart then shut off. (1) Disconnect switch. (2) Batteries. (3) Power circuit.(4)...
Interesting Wiring Schematic
Those pickups go to their own volume controls that are push/pull so I can coil tap them, and then onto a 5 way switch before going to the jack. To make it slightly more complex though, I`d like to put in a switch that determines whether the bridge is on or not when the 5 way is in a position other than positions 4/5. Then get a super switch and...
electronic circuit breaker
A circuit breaker is an automatically-operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. Unlike a fuse, which operates once and then has to be replaced, a
analog line follower robot
Perhaps we often see robots line follower robot which is going to follow the line on the track. in general line follower robot is controlled by a microcontroller, but in this article online follower robots in the design without using the microcontroller. For that you should try to assemble his Line Follower Robot series consists of three main part
PIR LED Security Light Circuit
Here is one simple circuit of a general-purpose white LED security light with Passive Infrared (PIR) Motion sensing mechanism. At the heart of the circuit is a PIR sensor module SB0061. SB0061 is a pyroelectric sensor module which developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB toge
Infrared Fire-Cracker Igniter
Firecrackers are normally ignited by using a matchstick or a candle. You have to run away quickly after igniting the fuse of the firecracker. This method..
Berkeley Bolometer Group - Research
Bolometer systems would be simplified considerably if all components could be made photolithographically on a single substrate. We are developing a design for a single-substrate array with several frequency bands that incorporates a planar antenna for coupling to the telescope, transmission-line filters for separating and defining frequency bands,
Altec 1566 vacuum tube mic preamp and direct box
V1 and V2 are 12AX7 dual triodes. Each half of V1 is wired as a Class A voltage amplifier in a configuration known as Common Cathode. By comparison, both halves of V2 are wired together in the Cathode Follower configuration for current gain. Don ’t freak dudes and dudettes! Tubes are real high impedance (Hi-Z) devices — just like a passive...
Switching Supply In Telephone Ring Generator
The telephone ring generator shown below generates the needed high voltage from a simple switching mode power supply (SMPS) which employs a CMOS Schmitt Trigger square wave oscillator, 10 mH inductor, high voltage switching transistor (TIP47 or other high voltage, 1 amp transistor) and a driver transistor (2N3053). The inductor should have a low D
simple security alarm
This circuit is a voltage-controlled oscillator, which is an oscillator whose frequency is determined by a control voltage. A 10 Hz sawtooth oscillator provides the control voltage in this case; this causes the frequency to rise slowly until it hits a maximum and then falls back to the starting frequency. The first op-amp is an integrator. A volta
The time constant of R1C1 determines the low-cutoff frequency while the time constant of R2C2 determines the high cutoff frequency. The pass-band gain, Avpass=R2/R1. For a low-cut filter, that is a high-pass filter, Za must be capacitors and Zb resistors. By substituting Za=1/sC and Zb=R into above equation, the following equation is obtained: For
NOGA Power Indicator/Guard
Rear Fog Lamp For Vintage Cars
According to current legislation in many countries, vintage cars must also be fitted with a fog lamp at the rear. In modern cars, there is a bit of circuitry associated with the fog lamp switch to prevent the fog lamp from going on when the lights are switched on if the driver forgot to switch it off after the last patch of fog cleared up. The cir
traffic light circuit diagram
The design of the current application of the wider selection of VHDL hardware description language to realize the intersection traffic light system controller hardware circuit description, in the Altera`s MAX PLUS EDA software platform environment through the compilation, simulation, and ed to the CPLD production of the device is programmed to ach
This Spy Pen FM Transmitter Circuit Can Be Built In A Ballpoint Pen. Crystal Controlled..
tachometer c code
Used a 12V motorcylce Battery and an ignition coil of a car. A microcontroller produces some pulses to the base of a 2N3055 transistor. 2N3055 turn on an off the primary of the coil and the desirable sound is produced between the probe and the surface. I have used a 12V motorcylce Battery and an ignition coil of a car. A microcontroller produces...
Car battery charger with MC78T12
4v stepper motor circuit diagram
The Car Relay Charger
Here he adapts an ordinary 40 amp car relay, converting it from having a “normally open” contact, to operating with a “normally closed” contact. It is not necessary for you to do this as automotive relays with “normally closed” contacts are readily available and are not expensive. The relay is then wired up so that it powers itself through its...
The Transistor Amplifier-P2
The three circuits above provide a constant current through the LED (or LEDs) when the supply rises to 15v and higher. The second and third circuits can be turned on and off via the input line. This is done by turning on the top transistor via the 2k2resistor. It keeps turning on until the voltage-drop across resistor R is 0. 65v. At this point the
10 Amp 13 8 Volt Power Supply
The circuit even has a current limiting feature which is a more reliable system than most commercial units have. The circuit uses 3 pass transistors which must be heat sink. Resistor R9 allows the fine tuning of the voltage to exactly 13. 8 volts and the resistor network formed by resistors R4 through R7 controls the current limiting. The LM723 lim
1998 Blazer-S10 Exterior Lights Circuit
Ultra low noise wideband preamplifier
The ZN459/CP used in this circuit is a high-gain low-noise preamplifier designed for audio/video applications at frequencies up to 15MHz. Figures 2-7B and 2-7C show typical PC board layouts for the ZN459 and ZN459CP (DIP), respectively. Figure 2-7D shows gain versus frequcncy.
Working on strowger phone exchanges involves a lot of soldering, but unlike modern electronics, you can`t use a fancy temperature controlled soldering station, with built in solder stand etc when you`re up a ladder. For one thing, you`ve usually only got a 50V supply available and for another, there`s no where to put the base unit half way up a...
ir repeater circuit
Driving a fluorescent tube
Even if a fluorescent tube it`s not a neon glow lamp and this page it`s not maybe at the right place, this circuit is very interesting because it uses an odd way to power a very common lamp. Like glow lamps, neon tubes are composed by two electrodes in a low pressure atmosphere composed by a mixture of gazes; usually argon and mercury producing UV
Sine wave-square wave converter circuit
12V Power Supply Circuits
4 simple 12V power supply circuits with output voltages around 12V. First power supply circuit is built with BD139, one zener diode and a few passive components. Each of the schematic is very simple to construct and will function without problems if you respect the maximum power supply ratings.
WIEN BRIDGE OSCILLATOR CIRCUIT
A 741 op amp is connected to a Wien-bridge, audio-sine-wave oscillator configuration, with C1, C2, R1, and R2 determining the circuit`s operating frequency. With the use of NPO capacitors and metal-film resistors, the oscillator`s frequency is stable enough for use in tone-control applications. The fixed-frequency oscillator shown can easily be co
Crazy Looper Schematic
I have included two schematics, one is the circuit without a programming port and one includes a programming port..
Stabilized DC Power Supply with Short-Circuit Indication
Stabilized DC Power Supply with Short-Circuit Indication. The circuit gives you four different regulated DC outputs (12V, 9V, 6V and 5V) and an unregulated 18V DC output, that are selectable by way of rotary switch S2. The selected output is showed on the analogue voltmeter connected to the outputs rails. This is definitely an effective 4-output s
car battery charger
This charger will quickly and easily charge most any lead acid battery. The charger delivers full current until the current drawn by the battery falls to 150 mA. At this time, a lower voltage is applied to finish off and keep from over charging. When the battery is fully charged, the circuit switches off and lights a LED, telling you that the cycl
Inverter Circuit For Soldering Iron circuit
Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors Q1 and Q2 (each BC547) form an astable multivibrator that produces 50Hz signal. The complementary outputs from the collectors of transistors Q1 and Q2...
Voice Shield for Arduino
The objective of this project is to build an Arduino voice shield to empower thousands of voice related applications! All this mostly thanks to an integrated ISD1790PY chip. This particular voice/ TTS feature can be useful to integrate voice messages in alarm systems, to implement generic I/O controls in home automation or even in home security ap
Bipolar digital multiplier has output polarity controlled by offset-binary-coded digital input word. Precision Monolithics DAC-08 D/A converter drives OP-02 opamp. 0utput is symmetrical about ground. -J. Schoeff and D. Soderquist, Differential and Multiplying Digital to Analog Converter Applications, Precision Monolithics, Santa Clara, CA, 1976, AN
Tired of always being snuck up upon? Doing any stealth surveillance or reconnaissance? Or maybe you just need to set-up a fail-safe alarm for your stu..
Measure current of your car alternator
electronic car ignition circuit
This scheme is for 4 cylinder motor. This will make your car spent less fuel, be a little bit faster and you wont have to frequently open your distributor cap to change the contact buttons thus wasting less money. T1/T2 create one monostable multivibrator in which C2 and R5 determine the length of impulse which is 1, 5 msec. Next in line are T3 and
Commander allows you to control your Alinco, Elecraft, Flexradio, Icom, JRC, Kachina, Kenwood, TenTec, or Yaesu radio from a PC running Windows 95, 98, NT, 2000, XP, Vista, 7, or 8; both 32-bit and 64-bit flavors of Windows are supported. Commander is free, and contains no advertising; commercial use is expressly forbidden. Icom IC-271, IC-275, IC
22 Watt Car Subwoofer Amplifier
22W into 4 Ohm power amplifier, Variable Low Pass Frequency: 70 150Hz This unit is intended to be connected to an existing car stereo amplifier, adding..
New LED driving techniques reduce power in LCD TVs
New design techniques in LED driver circuits promise to deliver significant energy savings that will go a long way toward helping TV manufacturers meet the tough requirements for power consumption..
guitar amplifier circuit diagram 100w
The ability amp lath has remained banausic back it was aboriginal appear in 2002. It absolutely isn`t broken, so there`s no acumen to fix it. The photo beneath shows a absolutely accumulated lath (available as apparent as M27). Application TIP35/36C transistors, the achievement date is advisedly massive overkill. This ensures believability beneath
15 volts power supply electronic circuit project using LT3512
A very simple dual 15 volts power supply electronic circuit project can be designed using the LT3512 switching regulator IC manufactured by Linear Technology. This simple 15 volts DC power supply electronic project operates from an input voltage range of 36 to 72 volts and delivers a dual 15 volts output at a maximum current of 0. 2A. As you can
Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall Or maybe you`ve come home to find your aquarium fish trying to swim across the carpet For your sake, we hope not, because the consequences are usually fairly dramatic. With a handful of electronic components, you can at least ensure that you will be war
sound via light
These relatively simple circuits can be used to transmit information across a small distance. The "information" I normally use is music from a radio, iPod or CD player - you could also try a microphone and amplifier. People transmit information all the time when they use remote controls for TVs, DVDs, stereo systems, etc. , but they usually do not
stepper motor tester
To build astepper motor tester, the circuit contains two sets of drivers that can support both unipolar and bipolar stepper motors. The control circuit and driver circuit are in separate power supplies that can work on a wider rangeof different power suppliesof motors. Themotor driver can support motors with power supplies from 5V-24V. The stepper
Adopt the two-dimentional bar-code scanner of DSP56F826 chip to introduce systematically
The system regards DSP56F826 chip as the key control module, uses the sensory chip of CMOS digital image, reachable 640* 480 picture element of definition that the picture is gathered. When needing the vision which carries on the high-resolution to be gathered, can use the chip cost will thereupon increase of 1024* 1024 picture element instead. D
Simple resistor, diode combinations trigger and control SCRs over the full 180 electrical degree range, performing well at commercial temperatures. These types of circuits operate most satisfactorily when SCRs have fairly strong gate sensitivities. Since in a scheme of this type a resistor must supply all of the gate drive required to turn on the
The figure based on LM3S101 adopts the controller to design
The figure adopts the controller as the capital equipment that digital quantity is gathered and controlled in the on-the-spot monitor system, the stability of the on-the-spot control work to the overall system of its characteristic has very important function. So develop structure to be simple characteristic stable adopting the controller,...
50MHz 10mW handy transceiver
One day on the 50MHz SSB-QSO, my friends JE3TXU/1 (Mr. Haraguchi) sad to me that he made 50MHz very small transceiver. I said to him that he shall inform about it on the Japanease CQ magazine. You can see about it on the book. See the photo! This rig is made by a surface mount construction. All transistor and resistor is made by surface mount...
bedini cole window motor
Experimenting with the window motor. The reason the window motor is so powerful, is the minor current required is an INDEPENDENT VARIABLE from the power of the permanent magnets on the rotors. The true power lies in the magnetic flux lines of the permanent magnets, the more powerful the magnet, the less power you need to run the motor! True aether
1W guitar amplifier
An alternative to the infamous ROG `s Ruby amp. As you see it shares with the Ruby the same topology: a buffer and a chip amp. It uses a JFET buffer with a MPF102 and the 1W TDA7052 chip. It is a clean amp and it reacts very well with any pedal in front of it. I don`t use a lot of distortion so this little amp suits all my needs. It doesn`t have...
X Infrared Remote Control
The ELM622 by ELM Electronics is a preprogrammed PIC which converts commands from a Sony infrared remote control into a serial data stream. An IR receiver using a ELM622 requires no kernel modifications. This project shows how to build a Linux IR receiver based on the ELM622 and how to use the receiver to control an X application such as xmms. The
Analog HF Antenna Analyser
Results are shown on an analog VSWR meter. The design was originally published in `Break-In`, New Zealand`s amateur radio magazine in Sept/Oct 2005, and is republished here with the permission of the editor. Note: `Break-In` is a term used in amateur radio to describe a system which allows another person`s signal to be heard in the brief
Low-Power Wireless Charging
Hi and welcome to my first instructable! I`m going to show you how to make your own low-power wireless charging circuits that will let you pass elect..
interfacing of led wiht avr atmega16
Interface an LED with AVR (ATMega16). Here I am using only one AVR microcontroller ATMega16, one register(10K), one capacitor(16uF/25v), One push button switch, Led BAR Green in stead of 8 led`s, power supply of +5v and -5v. Make the circuit as in diagram. Below is the circuits diagram and code for blink of the led will given below: // CODE For...
Test Gear Circuits
Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the LT700. This has a primary impedance of 1K and a secondary impedance of 8 ohms. Used in reverse
TDA2003 10W Car Radio Audio Amplifier
Completely safe operation is guaranteed due to protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V and fortuitous open ground.
This is how to make a trimet. The parts you need are: 3 Capacitors, a 2N3904, a 2N3906, a resistor(1k to 10k ohm), a solar cell (minimum 3 volts),..
lm317 adjustable power supply electronic project
By using a potentiometer, R2, as one of the resistors you can dial up the output voltage wanted. Either AC or DC input can be supplied to the Kit via a socket or terminal block. When external capacitors are used with any IC regulator it is good practice to add protection diodes to prevent the capacitors discharging back into the regulator in the e
Telephone electronic ringer circuit
Telephone electronic ringer circuit is shown as above,Figure (a) is the electronic ring circuit with an NPN transistor V1 (choose 9014 or 3DG12) as the core, sound devices YD is also feedback devices composed of the feedback pole and the buzzer equipped with the help of the sound chamber. L1, L2 connect to circuit line;C1 and R1 have limiting...
Digital centigrade thermometer
This circuit shows an ICL7106 connected with a silicon transistor to form a digital thermometer. Direct connections between the ICL7106 and an LCD display are shown in Fig. 12-11B. A diode-connected silicon transistor has a temperature coefficient of about -2 mV/ƒ. To achieve calibration, place the sensing transistor in ice water and adjust the
Simple Alarm Circuit
The simple circuit produces simple audible alarm like notification of sound, used as burglar alarm using five transistor.
Audio Mixer 6 Channel circuit
The following is a main circuit of the mixer-6 Ch The circuit consists of six input channels. The mono channels are channels 1-4 and 5-6 CH CH, are intended for use by music. The number of input channels you want as she can greatly increase you want. The output of each channel drives the RV1-6, the level of sound control potesometer. With RV7-12 c
Circuit-break locator for the holidays
The circuit illustrated here comes to the rescue by sniffing out defective bulbs by capacitively sensing the electric fields they produce ( see the figure ). To understand how it works, consider a string of bulbs with an opencircuited filament, labeled in the schematic as String Under Test. The intact filaments on either side of the burned-out...
AN7223 Am Tuner Fm/am If Amplifier Circuit For Radio Cassette Recorder Panasonic Semiconductor
UART, GPs This application note shows how to combine a GPs module SC16C2552B into a navigation system by using a Philips UART With the rapid development of GPs (Global Positioning System) techniques, GPs gets wider application in many fields. GPs has features such as high precision, global coverage, convenience, high quality and low cost. Recently
midnight security light circuit
This page describes the development of electronics to display a monochrome video image on an electrostatic oscilloscope tube. This work is complementary to the Electron Optics page in the Experiments section. The ultimate goal is to display a moving video picture on a completely home made cathode ray gun inside the bell jar of a vacuum rig. For th
Tone Control Circuit
The first BC109C transistor (left hand side) is acting as a buffer. It provides the circuit with a high input impedance, around 250k has a voltage gain of slightly less than unity. As the Baxendall tone control circuit is a passive design, all audio frequencies are attenuated. The position of the controls and reactance of the capacitors alters the
2 channel audio mixer circuit using transistors
This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio level. This two channel audio mixer require a power supply with the output voltage between 9 to
IDE Hard Drive Interface
Simple NiCd Battery Charger
A simple NiCd charger can be built using junk box` components and an inexpensive LM317 or 78xx voltage regulator. Using a current limiter composed of R3 and a transistor, it can charge as many cells as desired until a fully charged` voltage determined by the voltage regulator is reached, and it indicates whether it is charging or has reached the f
The anti exciting type switching power supply based on FSDM0565R is designed
At present, the switching power supply is with its high performance, high efficiency 75%, the switching power supply efficiency of the single scale integration has already been more than 90% now, This pair solves the energy problem and plays a role in adding fuel to the flames, the Piower supply of a lot of energy-conserving electric apparatuses h