This DC-DC converter published in this article is intended for use in general purpose, providing a source of 24 Volt DC stable for many applications low current. Right here already published two articles on electronic circuits DC-DC converters, like this converter circuit 12 Volts to 24 Volts with a current 2 and that mperes DC / DC converter circuit 12 Volts to 24 Volts using MOSFET.
The circuit presented here is different, it uses a single transistor in the output and how “oscillator” an integrated circuit Which is an LM358 dual op amp. One trimpot R6 10K Ohms makes adjustment of the output voltage. In reality it is not itself an oscillator, The operational amplifier works by comparing the voltage, a pulse generator.
In Article Basic Pulse Generator circuit using Operaciona Amplifierl can see a generator electronic circuit as an example. The comparison is made no pino 6 do integrado circuit LM358 , U1B enters a sample of the output voltage, has a reference voltage input at pin 9 by a trimpot.
List of components
R1, R4, R7 and R8 Resistores 100K 1 / 4W
R5 Resistor 470 Ohm 1/2W Resistor
R6 Trimpot 10K Linear Pot
C1 Capacitor 0.01uF Mylar
C2 Ceramic Capacitor 0.1uF de Disco
C3 470uF 63V Electrolytic Capacitor
Rectifier Diode D1 1N4004
D2 Diodo BY229-400
BC337 NPN transistor Q1
There is a critical component in this circuit, only L1 coil you will have to build, coil L1 is made by winding 60 turns of enamelled copper wire, with 0.63mm thick, toroidial core over a measuring 15mm (sternum diameter) por 8mm (internal diameter) por 6mm (grossura). D2 which is a BY229 diode may be any fast switching 100V 5A and BC337 transistor Q1 will need a heat sink, you can change this transistor for a BD line that provide greater power.