Top Circuits Page 155
- Page 155
-
An electronic dice is a classic first project for those getting interested in electronics. A timer, counter and a few LEDs makes a circuit that can also add a new twist to some old boring board games. When the switch is pressed, a 555 timer in astable mode....
-
-
This extremely simple FM radio receiver circuit is made possible by the special purpose TDA7000 IC. It integrates nearly all the functions necessary to build an FM receiver needing only a few external capacitors and a tuning circuit. Using a simple active RC....
-
This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
-
Have you ever wanted to run a TV, stereo or other appliance while on the road or camping Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends on which tansistors you use for Q1 and Q2, as well as how....
-
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....
-
This circuit lets you control any line powered electrical device (a lamp, television, fan, etc. ) using any infra-red remote control. Almost everyone these days has a pile of old IR remotes left over from appliances they have long ago disposed of them. With....
-
-
I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
-
Don`t like your little brother`s TV channel selection Hate the volume your wife sets the stereo at Want to just annoy someone This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that....
-
If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with....
-
The LED Metronome is a modern interpretation of a classic device which is a staple of music teachers, students and composers everywhere. This circuit uses 12 LEDs to simulate the sweeping motion of the pendulum and a speaker with a simple amplifier to....
-
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
-
-
A regenerative radio works by feeding back a small amount of amplified output of the detector back into the input. Thus it achieves sensitivity far beyond what only a detector could alone. This simple regen radio uses a single tube as it`s detector and....
-
Have you ever been using the modem or fax and someone else picks up the phone, breaking the connection Well, this simple circuit should put an end to that. It signals that the phone is in use by lighting a red LED. When the phone is not in use, a green LED....
-
A while ago I got an email asking for the schematic of a circuit to detect cut phone lines. It didn`t take me long to find this circuit in Electronics Now. When the circuit detects that a phone line has been cut, it activates a MOSFET which can be used to....
-
This circuit is extremely simple, therefore there is less chance of any problems. It can be placed anywhere on the phone line and it will record any conversation on any phone on that line. Please note: I have received several emails saying that this circuit....
-
Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful. It is easy to build, and is compact enough to be installed inside the phone....
-
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
-
This remote telephone bell ringer allows you to use a large (and loud) external bell in place or in addition to the built in (and rather wussy) ringer in most modern telephones. This is ideal for large outdoor areas, noisy shops or those hard of hearing.....
-
Servo motors have many uses in everything from robotics to puppetry to photography and beyond. These little motors can position their output shaft to any position on command and hold that position. Most servos have a range of motion to about 210 degrees and....
-
Similar to the CMOS based Touch Switch also on this site, this transistor based touch switch can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only a....
-
The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin package. With only a few external components, a simple radio with excellent selection and reception can be constructed. Since the chip also uses a low supply voltage....
-
Similar to the two transistor solid state Tesla Coil already on this site, this solid state Tesla Coil design uses a normal flyback transformer to generate it`s high voltage output. Unlike the other circuit, this one does not use two huge power transistors....
-
This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components. This circuit....
-
Edwin Henry Colpitts was a communications pioneer best known for his invention of the Colpitts oscillator. As research branch chief for Western Electric in the early 1900s, he and scientists under his direction achieved significant advances in the....
-
An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow. The sine wave or sinusoid is a....
-
An analog-to-digital converter is a device that converts a continuous quantity to a discrete time digital representation. An ADC may also provide an isolated measurement. An analog or analogue signal is any continuous signal for which the time varying....
-
An automatic feeder that would dispense food based on the activation of a series of buttons. The buttons, the system controller, and the food dispenser. The buttons and food dispenser interfaced with the system controller to allow for intelligent processing....
-
-
-
This post describes the key changes introduced in the new board revision. Note that although we have not yet exercised our option to add additional signals to the expansion connector, developers of expansion boards should continue to treat pins 4, 9, 14, 17,....
-
Here is the schematic diagram for the original arcade version of Pong, the first digital video game. Unlike other video games of the time, Pong used an all digital circuit to produce the graphics, sound and game control. There is no software or processor,....
-
-
Create a robotic team mascot for my team at work. My first, humble part of that project was to create a charger for the robot`s batteries. I wanted a battery charger that could charge the various NiMH battery packs that I have, ranging from 700 mAh to 2200....
-
The GDO originally used a triode vacuum tube configured as an oscillator, with a sensitive DC current meter measuring its grid current. Most versions found today are solid state (JFET) and have no grid (or grid current), but the name has stuck. This....
-
-
-
-
-
-
-
The 25 watt power audio amplifier circuit powered using tube circuit. The tube TR will amplify the input about 20 watt, dual Trafo should be gain up to 40w watt. You can use wide voltage range 12v 20V to supply the power tube...
-
The inverter is nice, thanks for the circuit. Please sir can you send the full function of IC1 and IC2 in this 3000W inverter circuit, to my email: sundawax@yahoo. com First of all i would like to greet you a pleasant day. Sir i am happy when found your....
-
-
-
-
-
-
-
-
-
A 1000 Watts Audio power Amplifier circuit for my outdoor use so I dont have any circuit diagram so if your having it then plz. its very urgent somehow I want to build it, its my passion, building an amplfier of high power..
-
-
-
-
-
-
-
-
-
-
IC LM4651 and LM4652 is a type of MOSFET ICs and power amplifiers include high-efficiency amplifier, suitable for self-powered speakers, a subwoofer and driver quality car. LM 4651 is a fully integrated conventional pulse width modulation (PWM) driver,....
-
-
Audio amplifier circuit board DUAL LOW NOISE EQUALIZER AMPLIFIER The KA2221 is a monolithic integrated circuit consisting of 2-channel low noise amplifiers and regulated power supp;y for car stereos. FEATURES suitable for car stereos. Low noise amplifier.....
-
-
-
-
-
-
-
-
-
-
On a lithium-ion cell, 3. 8V/cell indicates a state-of-charge of about 50%. It must be noted that utilizing voltage as a fuel gauge function is inaccurate because cells made by different manufacturers produce a slightly different voltage profile. This is due....
-
-
-
-
-
-
-
-
Here we have an astable oscillator built around 555, which gives an alarm tone of 1. 8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While the circuit shows only 1. 8 KHz operation, it....
-
The schematic diagram of 100 watt audio amplifier with MOSFET. The huge collection of electronic circuit diagrams are provided here 100W RMS Amplifier · 0-30V Stabilized Variable Power Supply with Current Control..
-
A Pair of Push-Pull Class A, Ultra Linear Mono Block Tube Amplifiers that can be used with several different vacuum tubes including KT77 / 6L6GC / KT88 with a 12SL7 driver and 6NO30 tubes...
-
-
In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is....
-
A amplifier of force RF for the FM, is always essential for the amateur that wants it strengthens some small transmitter, that likely already it has manufactured or has been supplied ready. The present circuit can give 50-60W RF force of expense, with....
-
The selection is made with ceramic filters. This 27 MHz receiver works with an intermediary frequency of 455 kHz...
-
C1=100nF Multilayer or ceramic C2 : 4. 7 pF ceramic C3 : 100 nF ceramic (1 or 10 nF will do also) C4 : 40 pf trimmer C5 : 4. 7 pF ceramic C6 : 10 pF ceramic C7 : 22 pF ceramic C8 : 1 nF ceramic C9 : 1 nF ceramic C10: 100 nF ceramic C11: 100 nF ceramic C12:....
-
Circuit uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1...
-
This simple circuit that can be used to flash incandescent lamps up to 10W power rating. The circuit is ideal for making flashing beacons on automobiles and other applications like that. The circuit is nothing but an astable multi vibrator based on Q1&Q2 (....
-
A keyboard key figure who work with electrical contact between the surface of the keyboard and the underlying circuit when pressed keytop area, used by some home computers the early 1980s, and has been widely used in consumer electronic devices...
-
-
The chips include an ATmega88 as the main controller, an AD9280 ADC, an LM6134 high-speed quad op-amp, an LM1881 video sync separator, a 74HC4066 as a simple analog switch, and an RS-232-level converter. LM1881 Video sync separator extracts timing....
-
MPEG-4 modules realizing real time compression & expansion plus network transmission of video data. The portfolio also includes small camera boards with image correction function...
-
-
Every key pad button generates 5 bit binary code and IC1 sends this code to the IR leds through D1 and D2 diodes. Code is shaped from 6 pulses with 5 gaps. Pulse position modulation PPM technique is used for transferring data. Data information occurs at....
-
-
-
-