The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
The transmitter we recommend to build is quite simple. It can even be built by a beginner. However, unlike the ease of construction and its small size, it is almost certain that it will impress you with its outstanding performance. Its autonomy is 12-15....
SGS Thomson's integrated TDA7294 is a high-frequency acoustic power amplifier, with true high-precision specifications, suited for all relevant applications. Its main feature is much higher output power than is usual in amplifiers with similar distortion....
At the left side (input AC) goes the secondary of a 220 volt (primary) 18 Volt (secondary) / 3 Ampere mains transformer. The alternating voltage of 18 volts from its secondary transformer is rectified by the diodes D1, D2, D3 and D4, which are connected to a....
This circuit is a metal detector capable of detecting large metallic objects. at a depth of 2m to 3m. It depends on the size of the object, and often on the type of soil. Construction is very easy to implement even for a beginner. The necessary components....
This is a Tesla/joule thief hybrid circuit that its inventor claim to produce 90 times the input power! The circuit can be self looped and can provide 1050W of power. from the 1050W only the 11.6W will loop back to supply the joule thief. If you remove the....
The sound is taken from a musical instrument in two different ways. Through a microphone that is placed in place by the instrument amplifier or via a direct connection between the instrument and the mixing console via a direct-box device. The benefits of....
The TDA 7294 of T-MICROELECTRONICS is a monolithic integrated circuit in a "Multiwatt 15" shell designed in principle to be used in amplifiers or class AB in high-fidelity applications such as stereo, active speakers, television receivers, and more. Thanks....
The simplicity of this transmitter compared to its very high performance makes it very interesting. Its output power is about 30 W and its range under normal conditions, with proper antenna and handling, reaches 30 km. The oscillator is the PL 84 which....
Is this a transmitter? Medium-wave short-wave consists of three transistors. The transistor AF115, along with the rest of its circuitry, is the oscillator of the device. The circuit of the two OC72 is the low-frequency amplifier (modulator), which forms the....
Europes leading SGS-THOMSON STMicroelectronics recently introduced a tone quite new to the Chinese mainland hydrazine fos power integrated amplifier TDA7294, swept past the lin..
Electronic switch is a multifunctional preamplifier. It consists of five-way touch electronic switch, high-speed DC servo RIAA ultralow distortion amplifier. It can be volume, ..
Figure 3-2 (b) is the second half of the circuit, VT17 ~ VT31 group into power amplifiers, pre-amplifiers, and it is a structure composed of exactly the same oIC2 its zero serv..
Figure 1-97 is a ten-band equalizer circuit with a first connection thereof. FIG lC is the utility voltage amplifier, R7, respectively, equivalent to the island in Fig 1-92 Rl,..
Figure 1-98 is a double five-band equalizer circuit composed of a second connection. FIG IC1 IC14 respectively equalizer per channel utility voltage amplifier; ICLl, IC24, IC 2..
Figure 1-99 with a five-band equalizer equalizer circuit TA7796 specific integrated circuit composed of the circuit in the public electricity voltage amplifier, an analog induc..
Electronic bass equalizer type of two quad op amp circuit, you can use TL084 high-speed operational amplifier circuit shown in Figure 9-680 left and right channels through R1, ..
Figure 4-27 (b) line than in Figure 4-27 (a) line more than a capacitor, to improve and increase the output current waveform DC voltage. Figure 4-27 (b) line shown can be used ..
DC generator automatic voltage regulator circuit is shown in Figure 7-53. This circuit is used to 40kW, 230V DC shunt complex machine, the voltage change rate up to 2.5 percent..
DC motor (brushless DC motor) double-loop speed control system, the speed controller output torque (or current) signal given. It can be used TL494 as a current regulator and cu..
DC shunt regulator power supply circuit Shown is a DC power supply circuit in parallel using the radio circuit, after the AC 22V output voltage by the step-down transformer 8V ..
DC power supply with shunt, the rectifier, filter, current limiting, voltage regulation, 10V voltage outputs, the circuit is simple, low cost, to meet the requirements of vario..
DC power supply: DC power supply with shunt, the rectifier, filter, limit, the regulator points jsIJ ~ string disabilities 10V, the circuit is simple. Cost low, can meet the re..
DC power supply under-voltage, over-voltage indicator circuit shown in Figure 13-93, use it to monitor the DC power supply voltage is normal. When the supply voltage is 12V, ad..
DC panel battery is widely used in power plants, substations DC system. To make the current system more safe and reliable operation line may be as shown uninterrupted power sup..
Consisting of integrated analog multiplier MC1596 synchronous detector as shown in FIG. The demodulated signal may be any amplitude modulated signal from the integrated circuit..
D switch S location function. FIG microphone to a speaker on behalf of the (also designed a door using an electret microphone) port channels through C9 send people IC2 amplify ..
FIG VDI ~ VD4 form a bridge diode rectifier, a full-wave transform the 220V AC pulsating DC, all the way for the red, green and blue (ie HI ~ H3) electric lights, another way t..
Constituting simple LM3915 audio power meter circuit diagram Note: If the internal resistance of 4 speaker when, Rx take 10k If the internal resistance 8 speaker when, Rx take ..
Explanation: This is a simple and low-cost broad-band high-frequency electric field strength meters. Field strength of the radio signal into a DC measurement, it is measured. R..