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This is a Electronic Extended Play Circuit Diagram. A single op amp-one of four contained in the popular LM324-is operating in a variable pulse width, free-running square wave oscillator circuit, with its timed output driving two transistors that control the on/ off cycle of the tape-drive motor. The Oscillator` s positive feedback path holds the secret to the successful operation of the variable on/ off timing signal.   Electronic Extended Play Circuit Diagram The two diodes and pulse width potentiometer R8 allows the setting of the on and off time, without affecting the oscillator`s operating frequency. One diode allows only the discharge current to flow through it and the section of R8 that it`s connected to. The other diode, and its portion of R8, sets the charge time for the timing capacitor, C3. Since the recorder`s speed is controlled by the precise off/on timing of the oscillator, a simple voltage-regulator circuit (Ql, R3, and D4) is included.  Connecting the spe...

VOLTAGE REGULATOR MODULES (VRM) A SOLUTION FOR CPU CORE VOLTAGE ELECTRONIC CIRCUIT For each phase, the components on point (2) above which constitute all the power components are placed on a small plug-in board of 1.15? x 0.85? that delivers 40 Amps and receives the PWM TTL signal from the controller. This module has a footprint of about 0.85? x 0.25? of the motherboard space and may be placed anywhere on the board as close as possible to theCPU reducing the transmission impedance and losses and giving the Motherboard designer the flexibility to optimize the power and PCB space utilization. Each modular board may be fitted individually with its own heat sink.

Li-Ion DRIVER WITH EXTERNAL PWM DIMMING ELECTRONIC DIAGRAM This boost converter is quite useful to improve conversion efficiency, reduce output ripple, and the use of small external components. In default, the LED current is set with external sensor resistor Rset, feed back voltage is regulated to 2000 miliVolts. During the operation, the current LED can be controlled using 1-wire digital interface through CTRL pin or with PWM signal that applied to the CTRL pin through the duty cycle. It determines the feedback reference voltage. The device also has a feature of integrated open LED protection that will disable the boost converter, this is to prevent the output from exceeding the absolute maximum ratings during open LED condition. L1: Murata LQH3NPN100NM0 C1: Murata GRM188R61A105K C2: Murata GRM188R61E474K D1: ONsemi MBR0540T1

The post explains a how a simple IC 556 oscillator may be used to create a simple electronic ignition system. Standard automotive ignition coil has been used in conjunction with a dual timer 556 and MOSFETs employed to handle the power. This can be termed as an electronic ignition. In the dual timer section one half is being used for frequency generation and the other part switches the oscillator section with breaker points getting “closed” and “open”. . The frequency generator section in this circuit produces a rectangular waveform having frequency of 200 Hz. that drives the MOSFET. IRF 740 has a V-dss of 400 Volts and I-d of 10 Amperes sufficient margin in terms of Voltage and Current rating shall keep the switcher cool and efficient. Pin 8 and pin 12 are being driven by the breaker contact that in turn produces an inverted signal at pin 9. As pin 9 and 4 have shared logic state, this determines the state of pin 5 that drives the FET. The frequency determining elements are 15 K,...

One of the common  rounds in the  quizzes is the buzzer round. We are describing here a simple electronic circuit that can be used in any test or quiz competition. In this circuit, only four persons can participate,  and  every  participant is assigned a certain number. Whenever a switch is pressed, the circuit locks the remaining three entries. At the same time, an alarm sounds and the designated switch number is displayed on the seven segment LED display.When a player presses his switch, the corresponding output of IC1 goes high. Let us suppose, when switch S1 is pressed, D1 input of IC1 goes low and its corresponding output Q1 goes high. As a result, current passes through D5 to piezo buzzer PZ1, which creates a beep. At the same time, current also passes through diodes D6-D7 to show the number on the LED display. Simple Electronic Quiz Switch Circuit diagram: Simple Electronic Quiz Switch Circuit Diagram Similarly, when any other switch (S2-S4) is pressed, ...

SOFT START MECHANISM FOR L200 VOLTAGE REGULATOR ELECTRONIC DIAGRAM Ic (constant current) is charge capacitor C, where Ic = Vsc/R. The output reaches its nominal value after the time ton. Vo-Vsc=(Ic.ton)/C. ton=C.[(Vo-0.45)/0.45].R = CVoR/0.45. Vo follows the voltage in pin 2 at less than 0.45 volt. It is because voltage of more than 0.45 V can’t be produced between pin 2 and pin 5.

HANDY 0-12V DC POWER SUPPLY ELECTRONIC DIAGRAM For heat protection, heat sink is needed for the BD679 transistor. It is because it will be over tempered when works more than 200mA. FEATURES: 0v to 12 volt output: - 700mA with M 2155 - 1.4amp with M 2156 - 1A with 16v AC 1.5 amp plug pack

LM2758 FLASH LED DRIVER EVALUATION BOARD ELECTRONIC DIAGRAM To startup the Evaluation board, set the EN1 jumper and EN2 jumper to the “OFF” position, apply power to the board, and then move the EN jumper(s) to the “ON” position. This is the expected startup operation in the typical application where VIN is tied to a voltage rail and the EN pins are controlled via logic signal.

Build an Electronic Project of USB-Based GPIB Controller. Contemporary research laboratories include a variety of instruments that connect using any of several interface methods to a PC for automating procedures and collecting data. Although different communication interfaces exist, the GPIB (general-purpose-interface bus) still enjoys wide popularity. The host PC must include a suitable GPIB controller—an internal interface card or an external device. Newer PC designs are phasing out traditional internal buses, such as PCI, ISA, and EISA, in favor of other standards, so using an external controller offers a more appropriate approach because external I/O ports, such as RS-232 and USB, tend to maintain backward compatibility. This Design Idea covers the development of a GPIB controller, which turned out to be easier and cheaper than commercially available alternatives. The design uses easy-to-obtain components with a total component cost of approximately $ 50. For comparison, a commerci...

L200 VOLTAGE REGULATOR SOFT START MECHANISM ELECTRONIC DIAGRAM The Vo follows the voltage at pin 2 at less than 0.45 V since a voltage of more than 0.45 V cannot be produced between pins 5 and pins 2. Constant current ic is charge capacitor C, where ic= Vsc/R After the time ton, the output reaches it’s nominal value Vo-Vsc = (Ic.ton)/C ton=C.[(Vo-0.45)/0.45].R = CVoR/0.45

AUTO RETRY fOR MAX1637 STEP-DOWN CONTROLLER ELECTRONIC DIAGRAM On microprocessor supervisor (IC1), an internal power-fail comparator and manual-reset circuitry (MR) is included. IC1's PFI input will detect when Vout(1.8V) is above the internal reference voltage (1.25V). Active-low RESET and active-low SHDN go high after a timeout delay of 140ms, re-enabling IC2. The other way to re-enabling IC2 is when the supply voltage is first switched on : the 3.5V rail stabilizes after 140ms will cause active-low RST to go high and activate IC2.The active-low PFO output produces a pulse using the internal 60k pull-up resistor and external 0.1 uF capacitor if Vout falls below 1.25V (due to a short circuit, for instance).

             This project is a robot vehicle that can be controlled through any computer wirelessly using a WiFi link. It transmits real-time video to the controlling computer using the same link. The video transmitting camera mounted on it. It also has obstacle detection,temperature,sound and light sensitivity feature.           Usually robots are controlled through a laptop using an WiFi link which is subject to attenuation, noise and has a very limited range as well. This project features a robot that uses WiFi 802.11G standard for its control signals through TCP/IP protocol, which has flow control. This enables uninterrupted and reliable transmission of control signal to the robot vehicle. WiFi support high data rates which enables good quality uninterrupted video transmission from the robot to the computer. Image capturing is done by mounting an IP-camera over the Robotic Car. Obstacle detection is done...

12 V AUDIO AMPLIVIER IC TDA7222AP ELECTRONIC DIAGRAM Use 12V DC for powering the circuit. The IC must be heatsinked. Speaker can be a 4 ohms one.For optimum performance input and output must be separately grounded. Pin Name Description 1 Vcc Supply Voltage 2 RR Ripple Reject 3 MC Muting control 4 OP AF Signal Input 5 FB FB Filter 6 GA Gain adjust 7 GND Ground 8 GND Ground 9 OP AF Output 10 BS BootStrap