Select your language
Select your language
Hits:352 Audio
DescriptionThis module can be a necessary addition to the Modular Preamplifier Control Center when more than two sources need to be connected to the preamplifier chain. Four high level inputs...
Read moreHits:372 Clocks, timers, relays, load switches
DescriptionProtect your home appliances from voltage spikes with this simple time delay circuit. Whenever power to the appliances is switched on or resumes after mains failure, the oscillator starts oscillating...
Read moreHits:449 Audio
This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This...
Read moreHits:419 Telefonie
Multi-function phone with caller ID (server) "Рhоnе Маstеr" and caller ID-prefix "Kalkofen", developed by the company TeleSystems, no doubt, lead the market, as their the apparent advantage is the volatility...
Read moreHits:427 Power supplies
In Fig. 4.6 shows a diagram of a power source that maintains its performance even in case of voltage loss in the network, wherein the device switches...
Read moreHits:589 Lighting
It often happens when someone from the household forgets to turn off a the light in the toilet - it can burn there without the use of a lot of...
Read moreHits:386 Filters and matching devices
In an article on the design of broadband transformers (SHPT) on the ferrite rings for LW transistor power amplifiers, it is noted that the cross section of the ring should...
Read moreHits:642 Television aerials
This is the conclusion I have come gradually. But here's the thing. To view TV shows are most commonly used active combo M/DM In antenna (AKA) with reduced size. Many...
Read moreHits:994 Filters and matching devices
To the transmitting and receiving devices in the UHF range very often used a master oscillator with a quartz resonator and the subsequent frequency multiplication. It complicates the design and...
Read moreHits:1474 Audio
This is a stereo VU booster circuit diagram based on transistor FCS9014 which usually used for pre-amp and regulator circuit and switching. With simple circuit design, this device could be...
Read moreHits:492 Power supplies
Here is the circuit diagram of active DC voltage doubler which used to increase the DC voltage.This circuit drives relays of 24 and 18VDC from a 12V power supply. Use...
Read moreHits:503 Audio
The following circuit is an distortion booster effect for your electric guitar. I don’t know whether this circuit is really works or not, you may try this circuit with your...
Read moreHits:375 Power supplies
DescriptionThis design was conceived as an add-on for the Variable DC Power Supply, a very successful circuit posted to this website. This simple unit provides a dual-rail variable output ranging...
Read moreHits:363 Power supplies
A simple 5 Volt regulated PSU featuring overvoltage protection. The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of...
Read moreHits:744 Other
The present tester is intended primarily for testing the 24 V electrical circuits found on most pleasure craft. However, if the resistors are given different values, the circuit may, of...
Read moreHits:1278 Television and video
VCRs (videoplayer) company SHARP early issues with asymmetric the location of the slot often fail due to a malfunction elements of LSM. Defects, discussed below, most devices (such as VC-6V3...
Read moreHits:312 Other
Most darkness activated alarms employ opamps and some logic ICs. Here, a less expensive approach is shown based on the eternal 555, this time in monostable multivibrator mode. Components R2...
Read moreHits:656 Power supplies
The proposed self SMPS (switching power supply) has a small size and high efficiency. Its feature is that the magnetic core pulse transformer works with entering into the saturated region...
Read moreHits:422 Lighting
Ideal to operate 3 to 24V DC existing on-circuit lampsThis circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit...
Read moreHits:581 Lighting
Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplate control the firing...
Read moreHits:500 Power supplies
This Power Supply is suitable for the Modular Burglar Alarm. However, it has other applications. It is designed to provide an output of 12-volts, with a current of up to...
Read moreHits:1018 Power supplies
Modern circuitry and chip manufacturers cool make life easier for the designer - for example, when creating an supply. We will demonstrate it on the chip...
Read moreHits:1882 Electronic fuel injection
The system includes a fuel pump, the drive of the fuel, fuel filter, pressure regulator fuel in the system, the doser-dispenser fuel, electro-hydraulic control pressure regulator, an injector and a...
Read moreHits:323 Other
Quartz crystals have the property that their amplitude/phase characteristic repeats itself at frequencies that are an uneven multiple of the fundamental frequency. There are so-called overtone crystals that are cut...
Read moreHits:464 House, garden land, hobby
Summer comes, and with it come the mosquitoes, and all sorts of other midges. Everyone knows how annoying mosquitoes, especially at night.The proposed device allows to be protected from all...
Read moreHits:503 Power supplies
ATTENTIONKeep in mind that THIS IS NOT A PROJECT FOR A BEGINNER, IT CAN BE VERY DANGEROUS IN CASE OF PROBLEMS, NEVER BRIDGE, BYPASS OR AVOID FUSES THESE WILL SAVE...
Read moreHits:1075 Shortwave antenna
On the construction of the attention of the reader antenna was told on the radio 10-15 years ago ham V. Volia beach (UA6DL), for which the author is very grateful...
Read moreHits:498 Medicine
Relatively small in size, infrared (IR) warns locator the sound signal of the approach to any obstacle (wall, fence) or object. The signal appears at a distance to the obstacle...
Read moreHits:455 Clocks, timers, relays, load switches
Hoping to equip the apartment "talking" for hours, tried to collect an acceptable design using typical domestic chips. But once faced with the complexities of "firmware" electronic...
Read moreHits:833 Security devices and alarm
DescriptionThis circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set...
Read moreHits:322 Other
This circuit enables any infrared (IR) remote control to control the outputs of a 4017 decade counter. It's quite simple really and uses a 3-terminal IR receiver (IRD1) to pick...
Read moreHits:521 Other
This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only ‘special’ component in the circuit is a window...
Read moreHits:573 Lighting
Flashing 13 LED unit, 3V supplyAlso suitable for jogger/walkersCircuit diagramParts:R1 10K 1/4W ResistorR2,R9,R10 100K 1/4W ResistorsR3-R8,R11-R16 10R 1/4W ResistorsR17 150R 1/4W ResistorC1...
Read moreHits:434 Telefonie
The speakerphone device for a loudspeaker handset. Publication: N. Bolshakov, rf.atnn.ru
Read moreHits:383 Power supplies
A symmetrical ±5V power supply is often needed for small, battery-operated operational amplifier projects and analogue circuits. An IC that can easily be used for this purpose is the National...
Read moreHits:471 Power supplies
To reduce the size and weight mains power supplies in recent years more wider use conversion voltage at a frequency of several tens of kilohertz. This source contains a mains...
Read moreHits:8890 Metal detectors
I developed the metal detector has not been used neither in peace operations to identify and neutralize minefields, nor in large-scale geological or archaeological surveys. Designed not for professionals but...
Read moreHits:355 Indicators, detectors
This circuit uses a single coil and nine components to make a particularly sensitive low-cost metal locator. It works on the principle of a beat frequency oscillator (BFO). The circuit...
Read moreHits:1366 Power supplies
In we offer our readers the article description and principle of operation practical scheme SMPS based cascaded flyback voltage Converter. No discharge voltage at the drain...
Read moreHits:944 Audio
The following is 4 x 25W quad audio amplifier circuit (amplifier with four inputs and four outputs) based TDA7381. This amplifier is designed for car audio system, but you can...
Read moreHits:420 Filters and matching devices
We offer a simple the bandpass filter of the transceiver. Feature filter is the use of only two main inductors. The filter circuit shown in the figure.These vessels are...
Read moreHits:698 Other
This is active high pass filter circuit for 327Hz frequency using LM741. It will use to build Harmonic at 3 of 130.81 frequency have the value at least. More than...
Read moreHits:584 Audio
Recorders with four-channel bridge amplifierFor four-channel bridge amplifier, which is equipped with almost all modern audio players, these options enable the AU can be combined in different ways. For example...
Read moreHits:349 Other
There are times when a small servo tester for modelling comes in very useful. Everybody who regularly works with servos will know several instances when such a servo tester will...
Read moreHits:542 Telefonie
The device as will be explained below, are designed to the extension of the functional opportunities phone devices that enhance usability use of them...
Read moreHits:948 Power supplies
To adjust or repair of electronic devices you need to have a few power sources. Many homes already have such devices, but, as a rule, they have...
Read moreHits:392 Bells and audio simulators
We offer you a scheme that is able to amuse children. It can to generate the sounds of police car siren, warble of birds, the sounds of space ships, etc...
Read moreHits:537 Security devices and alarm
On the basis of just two cheap integrated type 555 timers, you can collect affordable automobile anti-theft system. Its schematic diagram is shown in figure 1.Fig.1The timer And performs a...
Read moreHits:958 VHF antenna
We hope that You are already familiar with the design standard J-antenna, so will not delve into unnecessary details. The proposed antenna is a variation of the J-antenna and can...
Read more