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Hits:648 Audio
This melody generator can generate various English and Hindi tunes as also instrumental effects. Various modes of melodies can be selected through DIP switches. Other advantages are high volume and...
Read moreHits:649 Lighting
In our time the bulbs are available with very low headroom secure. The inrush current that occurs when the lighting often brings the bulb failure due to the small resistance...
Read moreHits:698 Audio
Design PhilosophyI did this design after getting a new computer. After buying the processor, monitor, and printer, I wasn't willing to spring for a set of speakers too. After going...
Read moreHits:848 Audio
The frequency range of 20Hz - 20kHz.Power output 14 wattsTotal harmonic distortion of 0.2%The peak value of the output current 3.3 ACurrent consumption in quiescent mode 150mAThe gain of 40dBInput...
Read moreHits:1345 Batteries, chargers
Scheme desulfating chargers offered by Samundri and L. Simeonova.The charger is made but the scheme half-wave rectifier diode VI with parametric voltage (V2) and current amplifier (V3, V4). The signal...
Read moreHits:441 Lighting
DescriptionThis circuit is usable as a Night Lamp when a wall mains socket is not available to plug-in an ever running small neon lamp device. In order to ensure minimum...
Read moreHits:708 Telefonie
Install the radio in the car has become commonplace for many motorists, the proposed scheme allows the use of the radio type "ONWA", "ALAN" not only for its intended purpose...
Read moreHits:421 Power supplies
This simple and inexpensive circuit can produce a dual (positive and negative) voltage from a single supply input. It is therefore extremely useful for powering opamp and other circuits that...
Read moreHits:1388 Audio
2 x 18W Hi-Fi Stereo Power Amplifier based around two TDA2030 ICs. It has good input sensitivity, low distortion, good operating stability and full protection against overloads and output short-circuits...
Read moreHits:508 Power supplies
The small size of the device is achieved due to the fact that it used small details. Transistors dissipate little heat: through them when a current flows, they are fully...
Read moreHits:575 Telefonie
Smart phones with caller ID "Rus" different versions have the function "answering machine", but its implementation in the majority of the devices required an additional set of so-called "voice" of...
Read moreHits:1375 Batteries, chargers
Every motorist wants more control over the state of the system power supply in the car. And reload, and nagasarete battery have a negative impact on her health, reducing the...
Read moreHits:967 Mixers, frequency converters
One of the most critical components of the receiver and the transceiver is a mixer. From the quality of its work depends on the sensitivity and dynamic range of the...
Read moreHits:3768 Shortwave antenna
The so-called antenna Groundplane type with built-in short-circuited quarter-wavelength loop of coaxial cable (Fig.1). The main advantage of antennas of this type - extended frequency range. ...
Read moreHits:1507 Shortwave antenna
Operated by Amateurs whip antenna (Ground Plane), as a rule, have a very high VSWR of up to 3, require bulky supporting porcelain insulator. Tuning of the antenna is...
Read moreHits:510 Clocks, timers, relays, load switches
The proposed device will be useful in any kitchen. The timer will allow you to monitor the cooking, and will signal her readiness. The device contains 5 independent timers that...
Read moreHits:424 Clocks, timers, relays, load switches
Description:A switched timer with equal make and equal space periods timing adjustable from over 6 minutes to 38 minutes.Circuit diagram:Notes:This timer circuit is similar to the 5 to 30 minute...
Read moreHits:676 Power supplies
Since my page was first posted, I have received a number of emails asking about a high current power supply. I looked around, but couldn't find one that was suitable...
Read moreHits:721 Indicators, detectors
The indicator move air (IPV) is a device that can to perform different functions:of the indicator opening (collapse) vents, Windows or doors sudden impulse wind;signaling the availability of a draft;indicator...
Read moreHits:1010 Batteries, chargers
Circuit diagramThis circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator)...
Read moreHits:1142 Audio
High requirements to modern speakers, can only be met by using multiple loudspeaker systems with two, three or more dynamic heads, each of which plays only the relevant part of...
Read moreHits:597 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:933 Metal detectors
Encyclopedia of electronics and electrical engineering Free library / Schematic of electronic and electrical devicesMetal detectors category FD (Frequency Domain), theory Encyclopedia electronics and electrical engineering /...
Read moreHits:864 Medicine
Electronic correction device body state allows non-drug means to manage his condition.In devices of similar purpose impact can be made through visual [1-5], auditory [6, 7], tactile [7, 8] analyzers...
Read moreHits:540 Audio
This circuit takes two separate line-level stereo (L & R) signals and combines them into one stereo (L & R) output, thus avoiding the need to switch between two pairs...
Read moreHits:1004 Other
If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace the switch with...
Read moreHits:555 Audio
DescriptionThis circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and...
Read moreHits:1549 Audio
Crowbar circuits are so-called because their operation is the equivalent of dropping a crowbar (large steel digging implement) across the terminals. It is only ever used as a last resort...
Read moreHits:539 Clocks, timers, relays, load switches
Electronic alarm clock built into a chip CIC. (click to enlarge)
Read moreHits:550 House, garden land, hobby
From early summer to late autumn the recreation or entertainment of many summer residents and tourists interferes with nocturnal animals - clouds of flying insects, moths, etc. Against them fit...
Read moreHits:511 Electronic devices
I, like many hams-designers in recent times dealing with electronic devices, focusing on powered by the vehicle electrical system. It is a powerful receiver and radio stations, and also special...
Read moreHits:2930 Television and video
Rhu (block of video heads or the rotating head unit) can be considered the main hub of any VCR or camcorder. Author of published article talks about his design, classifies...
Read moreHits:411 Lighting
In [1,2] describes the schema that allow you to extend the life of fluorescent lamps (LDS). They certainly deserve attention, attracted by its simplicity, availability and can be recommended for...
Read moreHits:775 Clocks, timers, relays, load switches
Muhammad Junaid AttaSir Syed University Of engineering And Tech.7th Semister Electronics EngineeringThis is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can...
Read moreHits:413 Other
This is a short-range light barrier for use as an intruder alarm in doorposts, etc. The 555 in the transmitter (Figure 1) oscillates at about 4.5 kHz, supplying pulses with...
Read moreHits:1012 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:905 Telefonie
The proposed switch (Fig.1) smoothly lights the incandescent lamp EL1 when you receive a call signal and gradually extinguish its completion. Alarm does not respond to the dialing and other...
Read moreHits:434 Other
This small circuit is ideal for checking the basic operation of an infrared remote control unit. The circuit is based on the brilliantly simple idea of connecting a piezo buzzer...
Read moreHits:843 Power supplies
Switching power supplies are widely used in modern electronic equipment. Readers are invited switching power supply 800 watts. As described previously, it is used in the field Converter transistors and...
Read moreHits:701 Power supplies
The described design can serve as an alternative laboratory the autotransformers (Latr), widely used in Amateur radio practice. In addition, this device has many advantages - no the galvanic connection...
Read moreHits:553 Power controllers, thermometers, heat
Setting indoors and out several temperature sensors series AD22100 and collecting the very simple device of a conventional arrow microammeter and a few other details, at any time to learn...
Read moreHits:539 Lighting
Buying a gift for someone special or a loved one can sometimes be difficult or expensive. The flashing heart is the answer. It is easy to build and even the...
Read moreHits:726 Audio
Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage is that there is no need...
Read moreHits:2757 Generators, heterodynes
The proposed supergenerators differs from the conventional crystal oscillators application instead of one or two identical parallel quartz resonators. This incorporation allows the adjustment of the oscillator frequency to a...
Read moreHits:361 Other
Here is the simple and low cost light alarm circuit built using timer IC 555 as the sound generator and a LDR to sense the environment light. This alarm is...
Read moreHits:823 Audio
As readers will know, there are already several power amplifier projects, two using IC power amps (aka power opamps). Both have been popular, and this project is not designed to...
Read moreHits:1517 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:485 Clocks, timers, relays, load switches
Device, scheme of which is shown in the figure, provides the load loss through a well-defined period of time after switching it on.The device is produced by the pulse applied...
Read moreHits:871 Bells and audio simulators
In the operation of an electric bell ZM-U (the manufacturer - The Les, Lobnya, Moscow region) revealed its shortcomings associated with installed in it is a mercury switch. With each...
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