Portable 12V to 250V Converter

Here are very simple and low-cost electronic circuit project for student and hobbyist. This portable 12v to 250V converter can be designed using this circuit diagram. This 12 to 250V converter is designed for portable use with a 12 V car battery. A built astabil multivibrator T1 and T2 generates a rectangular wave at a frequency of 50 Hz. As T1 and T2 drive alternative exit stage system also works in "push-pull".

When T1 lead by passing a current T3: T5 and that it engages the latter transistor connects to a half battery of 12 V secondary winding of the transformer Tr When T2 network drive, T6 transistor coupled to the battery the other half of the network adapter.

Portable 12V to 250V Converter Circuit Diagram:

 

If it is used for output stages 40 411 RCA transistors, the current through secondary winding can be up to 10 A, giving a power output of 180 watts. If you use 2N3055 transistors, power output will be about 90 watts. Since the output transistors are driven to saturation, they have very high mounted radiators.

Although circuit is simple construction and has high efficiency disadvantage is rectangular output voltage which, in the absence of a regulator is dependent on task: small loads, the output voltage is 250 V ac (not working properly for the engine speed control, light dimmers, televisions, hi-fi equipment.

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LT3582-12 DC 5V to 12V DC Converter

This is simple electronic circuit project of 12 DC 5V to 12V DC Converter Using LT3582-12 dual channel DC DC converter integrated circuit, manufactured by Linear Technology, can be designed a very simple step up dc converter.

LT3582-12 DC 5V to 12V DC Converter Circuit Diagram: 

 
This 5 to 12V c converter electronic project provide both positive and negative outputs required in many biasing applications such as active matrix OLED (organic light-emitting diode)displays as well as CCD (charge coupled device) applications.

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One-transistor Voltage Converter

Taking apart a solar-powered lamp  revealed a single-transistor voltage  converter circuit that allowed an LED  to be driven from a 1.2 V cell. The l/h  diagram shows the circuit (with slight  modifications). The circuit oscillates at  about 500 kHz and, at a cell voltage of 1.4 V, draws 11 mA with a respectably bright LED. The circuit works down to a supply voltage of 0.8 V.

One-transistor Voltage Converter Circuit Diagram:

The oscilloscope shows 3Vpp at the LED, as expected. The left-hand coil and the capacitor form a series resonant circuit, excited by the collector of the transistor which alternates periodically between conducting and blocking. When the transistor is off the upper coil dumps its stored energy so that the voltage on the collector rises to about double the cell voltage.

A sinewave voltage of 35Vpp (!) was measured across the capacitor in the resonant circuit. Using a two-channel oscilloscope showed the phase relationships: the resonant circuit shifts the phase by about 90 degrees. The base resistor coupled with the base capacitance and the Miller capacitance (http://en.wikipedia.org/wiki/Millereffect) of the transistor add a further phase shift.

The voltage increase obtained using the series resonant circuit can be used to make a bipolar voltage converter, for example to power operational amplifiers (see r/h diagram). Two electrolytic capacitors and two diodes rectify the voltage. The circuit can deliver a volt-age difference of 9 V at 0.2 mA, which is enough for a low-power opamp.

Author By:  Burkhard Kainka (Germany) Source By: Elektor

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Digital-DC Step-Down DC-DC Converter with ZL2106

The ZL2106 is an innovative power conversion and management IC that combines an integrated synchronous step-down DC/DC converter with key power management functions. The power supply circuit build around the ZL2106 IC can provide an output voltage from 0.54 volts up to 5.5 volts  from an input voltage range between 4.5 volts and 14 volts.

Digital-DC Step-Down DC-DC Converter Circuit Diagram:

Internal low RDS(ON) synchronous power MOSFETs enable the ZL2106 to deliver continuous loads up to 6A with high efficiency. The ZL2106 also supports phase spreading to reduce system input capacitance. This power supply circuit diagram will provide a 3.3 volts output from an 12volts input.

Main features of this converter are:Integrated MOSFET switches, 6A continuous output current, ±1% output voltage accuracy, Snapshot™ parametric capture, I2C/SMBus interface, PMBus compatible, Internal non-volatile memory (NVM).

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5 to 12v Converter with ADP1612

Using the ADP1612 step-up dc to dc converter manufactured by Analog Devicescan be designed a very simple step up converter. This step-up converter electronic project will provide a fixed 12v dc output voltage from an input voltage between 2.7 to 5 volts. ADP1612 is a switching converter with an integrated power switch capable of providing an output voltage as high as 20 V.

5 to 12v Converter with ADP1612 Circuit Diagram:

Because of their small package ADP1612 is optimal for space-constrained applications such as portable devices .

The ADP1612 operate in current mode pulse-width modulation (PWM) with up to 94% efficiency. Adjustable soft start prevents inrush currents when the part is enabled. The pin-selectable switching frequency and PWM current-mode architecture allow for excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors.

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High Current DC Power Converter with ISL8016

Using ISL8016 high efficiency DC DC power converter, an be designed a very simple dc converter which can provide up to 6A continuous output current from a 2.7V to 5.5V input.

High Current DC Power Converter with ISL8016 Circuit Diagram:

The output voltage of the DC converter is adjustable from 0.6V to VIN. With an adjustable current limit, reverse current protection, pre-bias start and over temperature protection the ISL8016 offers a highly robust power solution. This circuit uses current control architecture to deliver fast transient response and excellent loop stability.

100% duty-cycle operation allows less than 200mV dropout at 6A output current. In the table bellow you can see components values in concordance with output voltage .

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Period-To-Voltage Converter

This is a Simple Period-To-Voltage Converter Circuit Diagram. The circuit input signal drives ICD. Because ICD`s positive input (V+) is slightly offset to + 0.1 V, its steady state output will be around +13 V. This voltage is sent to ICC through D2, setting ICC`s output to +13 V. Therefore, point D is cut off by Dl, and CI is charged by the current source.

Simple Period-To-Voltage Converter Circuit Diagram:

Assuming the initial voltage on CI is zero, the maximum voltage (^Cinax) is given by: When the input goes from low to high, a narrow positive pulse is generated at point A. This pulse becomes -13 V at point B, which cuts off D2. ICC`s V+ voltage becomes zero. The charge on CI will be absorbed by ICC on in a short time.

The time constant of C2 and R5 determines the discharge period— about 10 /is. ICB is a buffer whose gain is equal to (R& + R9)~Rg = lM5. ICD`s average voltage will be (1362f 1.545) + 2 = 1052/. RIO and C3 smooth the sawtooth waveform to a dc output.

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3.3V from 5V Power Supply Using ADP2118 dc

This 3.3V from 5V power supply circuit is designed using ADP2118 dc converter designed by Analog Devices ad is an synchronous, step-down, dc-to-dc converter.

this 3.3V from 5V power supply circuit will provide output voltage of 3.3 volt at a maximum current of 3A. ADP2118 dc converter uses a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response.

3.3V from 5V Power Supply Circuit Diagram:

The ADP2118 can be configured to operate in pulse frequency modulation (PFM) mode that reduces switching frequency to save power. This circuit operate from input voltages of 2.3 V to 5.5 V. The output voltage of the ADP2118ACPZ-R7 is adjustable from 0.6 V to input voltage (VIN), and the ADP2118ACPZ-x.x-R7 are available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V.

Some features features of the ADP2118 step-down dc-to-dc converter are: 3A continuous output current, 75 mΩ and 40 mΩ integrated FET, ±1.5% output accuracy,600 kHz or 1.2 MHz fixed switching frequency , synchronizable between 600 kHz and 1.4 MHz, Selectable PWM or PFM mode operation, Voltage tracking input, Integrated soft start, thermal shutdown .

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2.5V 1A dc converter circuit with FAN8060

Here is Simple electronic circuit diagram. This 2.5V 1A dc converter circuit is designed using FAN8060 designed by Fairchild Semiconductor, which is a 1MHz, 1A integrated synchronous step-down regulator for DC-DC conversion that provides a peak efficiency of over 95 percent.

2.5V 1A DC Converter Circuit Diagram:

FAN8060 step-down regulator offers a fast transient response time that swiftly responds to current fluctuations when there is a sudden change in load .The FAN8060 also allows a designer to simply adjust the external compensation to optimize the transient response for any condition. The user-selectable current limit provides protection against output overload and short circuit while its external synchronization pin reduces both EMI and crosstalk.

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Inductorless 3-to-5 Volts Converter

Inductorless 3-to-5 Volts Converter Circuit Diagram. By configuring a comparator and a transistor to control the oscillator in a charge pump circuit, you enable the pump to generate a regulated output of in principle any desired value. Charge pump ICs can either invert or double an input voltage (for example, 3 V to –3 V or 3 V to 6 V). The charge pump itself does not regulate the output voltage and one running off 3 V is not normally capable of generating intermediate output voltage levels like 5 V. However, by adding a comparator and a reference device, you can create arbitrary output levels like 5 V and regulate them as well.

Inductorless 3-to-5 Volts Converter Circuit Diagram:

Charge pump IC1 (a MAX660) has an internal oscillator whose 45 kHz operation transfers charge from C1 to C2, causing the regulated output to rise.

When the feedback voltage (pin 3 of IC2) exceeds 1.18 V, the output of comparator IC2 (a MAX921) goes high, turning off the oscillator via T1. The comparator hysteresis (easily added on IC2) is zero here simply because no hysteresis is required in the control loop. The oscillator when enabled generates two cycles, which is sufficient to drive VOUT slightly above the desired level. Next, the feedback turns the oscillator off again.
The resulting output ripple will depend mainly on the input voltage and the output load current. Output ripple may be reduced at the expense of circuit efficiency by adding a small resistor (say, 1 ?) in series with C1. You’ll find that ripple also depends on the value and ESR associated with C1 - smaller values of C1 transfer less charge to C2, producing smaller jumps in V OUT.

Author: D. Prabakaran

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Triangle to Sine Converters

This is a simple Triangle-to-sine converters circuit diagram, this circuit conversion of triangle wave shapes to sinusoid is usually accomplished by diode-resistor shaping networks, which accurately reconstruct the sine wave segment by segment. Two simpler and less costly methods may be used to shape the triangle waveform of the 566 into a sinusoid with less than 2% distortion. The non-linear IDSVDS transfer characteristic of a P-channel junction FET is used to shape the triangle waveform.

Simple Triangle to Sine Converters Circuit Diagram:

The amplitude of the triangle waveform is critical and must be carefully adjusted to achieve a low distortion sinusoidal output. Naturally, where additional waveform accuracy is needed, the diode-resistor shaping scheme can be applied to the 566 with excellent results since it has very good output amplitude stability when operated from a regulated supply.

The amplitude of the triangle waveform is critical and must be carefully adjusted to achieve a low distortion sinusoidal output. Naturally, where additional waveform accuracy is needed, the diode-resistor shaping scheme can be applied to the 566 with excellent results since it has very good output amplitude stability when operated from a regulated supply.

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400V-60W push-pull DC-DC Converter

This is the simple and powerful 400V-60W push-pull DC-DC Converter Circuit Diagram. The TL494 switching regulator governs the operating frequency and regulates output voltage. Switching frequency approximately 100 kHz for the values shown. Output regulation is typically 15% from no-load to full 60 W.

400V-60W push-pull DC-DC Converter Circuit Diagram:

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Simple 400V-60W push-pull DC-DC Converter

This is the simple and powerful 400V-60W push-pull DC-DC Converter Circuit Diagram. The TL494 switching regulator governs the operating frequency and regulates output voltage.

Simple 400V-60W push-pull DC-DC Converter Circuit Diagram:

Switching frequency approximately 100 kHz for the values shown. Output regulation is typically 15% from no-load to full 60 W.

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Radio Beacon Converter

The radio beacon band extends from 280 to 516 kHz. Each beacon has its own characteristic AM`-modulated morse-coded callsign that is transmitted on a specific frequency. To be able to receive distant beacons, the aerial signal is passed through a band-pass filter that effectively suppresses longwave and mediumwave signals. 

Radio Beacon Converter Circuit Diagram:

The filter also converts the aerial impedance, Zm, from about 10 KOhmhm to the input impedance of mixer IC1, which is about 1 KOhmhm. The mixer adds or subtracts the received signal to/from the local oscillator signal so that the beacon signal can be received on a normal shortwave receiver. The resulting frequencies are from 9.72 to 9.48 MHz or from 10.280 to 10.516 MHz.

In the construction of the converter, some components must be surrounded by a metal shield, as indicated by dashed lines on the PC board layout. The circuit is aligned with the aid of an SSB receiver, to which the output of the converter is connected. Tune the receiver to 10 MHz and adjust the oscillator frequency of the converter with C8 for zero beat. Next, detune the receiver slightly until you hear a pleasant whistle, which is adjusted for minimum level with the aid of PI. Finally, tune to a beacon transmitting at or about 300 kHz and adjust C13 for maximum sound output.

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800 To 1000Mhz Scanner Converter

This converter enables reception of 800 to 1000 MHz on any scanner covering the 400 to 500-MHz range. The converter can be set up to cover either 800 to 900 MHz or by readjustment 900 to 1000 MHz. Sensitivity is very high because of the GASFET front end.

Circuit Diagram:

For best results, the scanner should be of a programmable variety.

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24v to 12v Converter

As you can see, the circuit is not more than a regulator adjustable integrated voltage which is acting on a group of parallel power transistors. These transistors are drudgery so tell it while the controller is responsible for controlling them. Where this 24v connector is the entrance from the batteries. The 12v connector is the output and Gnd connector should be put to ground. Of course, all of the components (transistors and integrated) with good heat dissipation and electrically isolated from the metal.

24v to 12v Converter Circuit Diagram:

Setting:

Position potentiometer 10 k Ω at its maximum travel (all open or 10 k Ω) and connect to the converter output a LAMP 12V / 50W. At the entrance to connect the batteries in series with what are accomplished the 24V. put a tester on a scale of continuous with a proper graduation (which ronde the 50V) out, in parallel with the lamp. Begin to turn the potentiometer until the lamp brightness and the tester indicates 12V.

Power:

• V max: simple 24V DC
• I max:

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12-16V-Converter

This Converter  Electronic Circuit Project a very simple build 12-16V-Converter. Many devices operate from a car`s 12-V electrical system. Some require 12 V; others require some lesser voltage. An automobile battery`s output can vary from 12 to 13.8 V under normal circumstances. The load requirements of the device might vary.

12-16V-Converter Circuit Diagram:

This circuit maintains a constant voltage regardless of how those factors change. Simple circuit, A, uses a 7805 voltage regulator. In addition to a constant output, this JC provides overload and short-circuit protection. That unit is a 5-V, 1-A regulator, but when placed in circuit B, it can provide other voltages as well. When the arm of potentiometer R1 is moved toward ground, the output varies from 5 to about 10 V.

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115 Vac Converter using NCL30100

This power supply Electronic Circuit Project is an very simple 115 Vac Converter, designed using the NCL30100 compact switching regulator controller designed for high brightness LED driver applications where efficiency and small size are very important.

115 Vac Converter Circuit Diagram:

The input voltage range is from 85 to 140 Vac and is rectified by bridge rectifier D1, D3, D4 and D6. C1 capacitor is used to limit current peaks generated during on time period. CX1, C2 and L1 are an EMI filter to protect mains against current spikes mainly generated by D2 if Q1 is turned on. The NCL30100 is powered through resistors R1 and R2.

The Vcc voltage is limited by D7and the maximum LED current is set by resistors R3, R4 and R5 (in this case Rsense is 0.33 Ω to reach higher accuracy). C3 capacitor is used to filter out spikes which are generated during the turn off of diode D2. It is recommended to use L2 with low series resistance since current is flowing through the inductor continuously and D2 should be selected for low forward voltage drop and fast reverse recovery time.

The main important features of this converter electronic circuit project , based on the NCL30100 compact switching regulator controller are : input voltage: Vin 115 Vac , nominal LED current: 700 mA (rms) , LED ripple: 120 mA (peak to peak) , VLED: 3.2 V , freewheel diode Vf: 0.5 V, target switching frequency: 50 kHz , dimming using PWM signal 1 kHz with duty cycle 0 – 99% .

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3-to-12-Volts Converter using LM2700

This Power Supply Electronic Circuit Project a very simple and high efficiency step-up dc dc converter circuit that require few external components can be designed using the LM2700 step-up DC/DC converter with a 3.6A, 80mohms internal switch and pin selectable operating frequency.

3-to-12-Volts Converter Circuit Diagram:

With the ability to produce 500mA at 8V from a single Lithium Ion battery, the LM2700 is an ideal part for biasing LCD displays. The LM2700 can be operated at switching frequencies of 600kHz and 1.25MHz allowing for easy filtering and low noise. An external compensation pin gives the user flexibility in setting frequency compensation, which makes possible the use of small, low ESR ceramic capacitors at the output.

This circuit can be used for handheld devices and some other portable applications .

This step-up DC DC converter will provide a 12 volts DC output voltage from an input voltage range between 2.5 to 4.2volts .

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5 Volt Power Supply using LTC1174

This electronic circuit project a very simple high efficiency 5 volt power supply electronic project can be designed using the LTC1174 simple current mode DC DC converter, ideally suited for high performance power supplies . With an internal 0.9Ω switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC DC converter. Under a no load condition the LTC1174 draws only 130μA.

5 Volt Power Supply Circuit Diagram:

In shutdown, it draws a mere 1μA making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source. The maximum output current that is provided by this electronic project is around 160 mA at a fixed 5 volt output voltage .

As you can see in this electronic project , this DC DC buck boost converter require few external electronic parts and not require any settings . L1 and L2 coils must be a 100uH inductor , you can use a Coiltronics CTX100-4 type . Input voltage for this 5 volt DC DC converter can be between 4 and 12 volts .

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