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This is very simple electronic circuit project of dual step-down power-supply (smps) controller circuit using the MAX17031. Dual step-down power-supply (SMPS) controller can be designed a very simple high efficiency power supply circuit with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems. Dual Step-Down Power-Supply (SMPS) Controller Circuit Diagram: Low-side MOSFET sensing provides a simple low-cost, highly efficient current sense for valley current-limit protection. Combined with the output overvoltage and undervoltage protection features, this current limit ensures robust output supplies. The device includes independent shutdown controls with well-defined logic thresholds to simplify power-up and power-down sequencing. To prevent current surges at startup, the internal voltage target is slowly ramped up from zero to the final target over a 1ms period. The Max17031 can be used in applications like : Notebook Computers , Ultra-Mobile P...

Stroboscope is a device used to make a cyclically moving object appear slow-moving or stationary. This is realised by illuminating the object intermittently with short pulses of light. Stroboscope is used in the study of insect flight. It can also be used for experiments with simple pendulum, studying details of rapidly moving objects and strobo-animation. Here is the circuit of a stroboscope that produces dual-coloured light pulses (refer Fig.1). The circuit uses red and green LEDs as light sources to illuminate the object. You can choose the frequency of the stroboscope’s light pulses from a wide range of 5 Hz to 5 kHz as desired. The range of frequency (5-50 Hz, 50-500 Hz, 500 Hz-5 kHz, etc) is selected through capacitors Ca (C2, C3 and C4), Cb (C5, C6 and C7) and Cc (C8, C9 and C10). Circuit diagram : Dual-Colour Stroboscope Circuit Diagram Smooth variation of the frequency range is achieved by varying VR1. The length of the light pulses (both red and green pulses are of equa...

Overview: The AN7171NK and AN7176K are ICs for power amplification of 14W (13.2V, 4Ω) output. It can provide stereo operation since two BTL amplifiers are incorporated in achip. It incorporates various protective circuits, thus providing high reliability. The circuits can be turned on or offwith supply pins energized, because the stand-by circuit is built-in. Circuit Diagram: Dual BTL 14W Audio Power Amplifier Circuits

  Notes: In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher, allowing for losses in the regulator. An application for this type of circuit would be for a small regulated bench power supply .

Stepper motors are brushless DC motors which can move in discrete steps thanks to the special coil arrangement inside. They are very popular in DIY and industry projects which require accurate mechanical movement control. In this SoloPCB project, we are building a dual stepper motor driver shield based on two Allegro A4988 ICs which can supply up to 35V and 2A and provide overcurrent and thermal protection. [ ]

Dual High Side Switch Controller Circuit diagram : Dual High Side Switch Controller Circuit Diagram One of the most frequent uses of n-channel MOSFET’s is as a voltage controlled switch. To ensure that the MOSFET delivers the full supply voltage to the load it is necessary for the gate voltage to be a few volts above the supply voltage level. This can be a problem if no other suitable higher volt-age sources are available for use elsewhere in the circuit. The LTC 1982 dual high-side switch controller from Lin-ear Technology (www.linear-tech.com) solves this problem by incorporating a voltage tripler circuit in the gate driver stage. The gate voltage is limited to +7.5 V which is 2.0 V above the IC’s maximum operating voltage. It can directly drive the gate of logic-level MOSFET with a VGS(th) from 1.0 V to 2.0 V. A suitable n-channel logic level MOSFET would be the BSP 295. This device can switch up to 1.5 A and is available in an SOT 233 SMD package.

The circuit described here is based on the superior characteristics of dual-gate MOSFET (metal-oxide semiconductor field-effect transistor). It exhibits a very high input impedance that lends for good sensitivity and very less loading of the input signal source. Low cross-modulation characteristic leads to minimal distortion of the output with respect to the input signals. Also, the MOSFET offers low feedback capacitance and high transconductance. All these advantages make the MOSFET the most effective for high-quality mixer and converter applications. This dual-input audio frequency mixer circuit employs a single dual-gate MOSFET 3N200. One may, however, substitute it with any other dual-gate.  MOSFET such as 3N187 and BF966. (It is to be noted that BF966 is not gateprotected and hence calls for suitable precaution in handling it.) The audio frequency (AF) input from the first channel (CH1) is applied on gate 1 (G1) of the MOSFET through 500- kilo-ohm potentiometer VR1. The AF input f...

This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound of Police or Fire-brigade cars is generated, by the oscillation of IC1A and IC1B gates. With SW1 set to the other position, the old siren sound increasing in frequency and then slowly decreasing is reproduced, by pushing on P1 that starts oscillation in IC1C and IC1D.  The loudspeaker, driven by Q1, should be of reasonable dimensions and well encased, in order to obtain a more realistic and louder output. Tone and period of the sound oscillations can be varied by changing the values of C1, C2, C5, C6 and/or associated resistors. No power switch is required: leave SW1 in the low position (old-type siren) and the circuit consumption will be negligible. Single -IC Dual-tones Siren Circuits Diagram Parts: R1 ,R3 ___470K    1/4W Resistors...

Features: Built−in Protector Circuits (for surge and thermal, etc.) Built−in Automatic Operating Point Stabilized Circuit Low Distortion, Low L/F Noise Small Transient Nosie at Power ON/OFF Switching Good Channel Separation Few External Components Pin connection: Dual Audio Power Amp 5.3W/Ch. NTE1371 Supply Voltage (Note 1), VCC . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Peak Supply Voltage (Note 2), VSURGE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Total Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A Power Dissipation (TA = +30°C), PD . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30W Operating Temperature, Topr . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . −30° to +75°C Storage Temperature Range, Tstg . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C

This electronic circuit is a very nice and simple alarm circuit that is based on the 555 timer integrated circuit. This alarm circuit can be used with many types of sensors like : light or temperature sensors. As you can see below some types of sensors that can be connected at this type of alarm circuit ( darkness , light , cold and heat sensor ). If the sensor detects that the temperature or light is outside of the desired range the alarm will be activated .By turning the  potentiometer from the base of Q1  you will modify the sensibility of the sensor . When the alarm is activated the Q2 transistor acts as an audio amplifier and speaker driver for the 16 ohms speaker . This alarm circuit require a 12 volts DC power supply circuit .

This electronic circuit is a very nice and simple alarm circuit that is based on the 555 timer integrated circuit. This alarm circuit can be used with many types of sensors like : light or temperature sensors. As you can see below some types of sensors that can be connected at this type of alarm circuit ( darkness , light , cold and heat sensor ). If the sensor detects that the temperature or light is outside of the desired range the alarm will be activated .By turning the  potentiometer from the base of Q1  you will modify the sensibility of the sensor . When the alarm is activated the Q2 transistor acts as an audio amplifier and speaker driver for the 16 ohms speaker . Dual Sensor 555 Timer Alarm Circuit Diagram This alarm circuit require a 12 volts DC power supply circuit .

Overview: AN7125 is a monolithic integrated circuit designed for  13.5 W (12 V,4 Ω) output audio power amplifier.It is a  dual channel BTL IC suitable for stereo operation in radio  cassette and TV application. Features: Built-in muting pin Built-in stand by pin Built-in thermal shutdown protection circuit Built-in current limiting circuit High power : (13.5 W/12 V/4 Ω) (13.0 W/15 V/8 Ω) Few external components Operating voltage range 6 V ∼ 18 V (12 V typ.) Circuit Diagram: Dual Channel Power Amplifier Datasheet for AN7125:Download