Skip to main content

Build a Low Power Variable Voltage Converter


Using electronic diagram below can be made a voltage converter that allows laps positive voltage of existing power sources, or convert it into a negative voltage.

New supply is electrically isolated from the source through the ferrite transformer wound on a torus G2-3FT12. Primary winding consists of 30 turns. Number of turns in the secondary, n, is calculated using the equation: n = 30 Uo / Ui, where Uo is the desired voltage and Ui is the input voltage. Add to compensate pieriderior 20.05.10 turns. If the output voltage is higher, it can always reduce Pi. Both coil windings can be enamelled copper wire with a diameter of 0.3 mm.

 Low Power Variable Voltage Converter Circuit Diagram:

Converter Circuit Diagram

The transformer is controlled by a gate CMOS Schmitt trigger and Do with transformed into a rectangular signal generator R1 and C1.

Additional current to charge C1 is provided by R2 and Pi, which controls the duty cycle of the rectangular signal. The signal frequency is about 220 kHz and fill factor or should be less than 0.5.

When T1 is opened, some of the energy is transferred to the secondary winding and some is stored in the magnetic circuit. When T1 conduction ceases, the magnetic field energy transfer in the secondary winding.

The current through Q1 will increase dangerously if secondary task is too big. Average current through the primary should not exceed 150. The report gave the scheme, secondary task can not be less than 80 ohms.
Besides excessive loads should also avoid working without load.

Converter efficiency at a supply voltage of 15 V is about 65%. The low current load, it decreases to about 50%. Efficiency also decreases when the supply voltage is lower than indicated. The current drawn from the source of 15 V for a load of 80 ohms is about 165 mA.


Comments

Popular posts from this blog

NE566 Function Generator Circuit Diagram

The NE566 Function Generator is a Voltage-Controlled Oscillator of exceptional linearity with buf fered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The Oscillator CAN be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity.  FMAX = 1 MHz     WIDE 1000:1 Continuous Sweep Possible  NE566 Function Generator Circuit Diagram Pdf Datasheet  Sourced by : Circuitsstream

Transceiver Homebrew QRP SSB 80M Band

Radio communication transceiver is a radio transmitter at the same time the plane doubles as a radio receiver used for communication purposes. It consists of the transmitter and the receiver are assembled in an integrated way. In mulamula generation, the transmitter or receiver or transmitter and receiver sections are assembled separately and is part of a stand sendirisendiri and can work well sendirisendiri Currently employed both parts are integrated in turn. Aircraft simple transmitter consists of an oscillator generating radio vibration and this vibration after vibration boarded with our voice, in a technique called dimodulir radio, then by the antenna is converted into radio waves and transmitted. As we know that the sound waves we can not reach long distances, although its power is quite large, while the radio waves with a relatively small force can reach a distance of thousands of kilometers. In order for our voice can reach a far distance, then our voice superimposed on radio w...

Altec Lansing 353A – power amplifier – vacuum tube type – Circuit diagram 6L6 12AX7

Used tubes – 12AX7 [pre-amplifier, tone control and audio pre-amplifier] – 6L6GC [audio output] Circuit diagram Tube pin-out -6L6 Tube pin-out 12AX7