If your load want 24V. But you have only 12V.
Of Course, it does not work.
What can you do?
First, add or change the battery into 24V. But no space and expensive.
Better way! Use 12V to 24V step-up converter circuit. Even the output current is low down to about 1A.
Do not be surprised. If see TDA2004 is in the circuit. Even it is good at the mini amplifier.
It is really, really.
We are building a type of switching regulator with it.
We use it to produces the high current pulse to the simple double voltage circuit. Which they work with the capacitors and diodes.
This does not need to use any coil.
So, easy and cheap.
And, Imagine when you finish this DC converter job. You are bored. You can rebuild it into a nice amplifier.
This project can increase the DC voltage from 6V into 12V, or from 12V to 24V. It is a simple DC to DC step-up converter circuit.
Also, you can use both ICs TDA2004 and TDA2005.
And, this circuit is similar to DC step up converter using TDA2822. It is smaller but also well.
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The working principle
First of all, the voltage comes to the circuit. Then, this voltage will charge to C5 through D1. At the pin 10(output) of IC1/1 has the voltage rises up. Until almost equal to the voltage of the power supply.
Next, D2 pass the current to charge into C6. It makes the voltage at pin 10 of IC1/1 is about 0V. But the voltage across C6 or the output equals about the power supply.
After that, the output(pin 8) of IC1/2 start to has the voltage rises instead. Because C5 stop charging. So, C7 is charged instead, through the power supply.
Thus, there is the current pass D3 to charge into C6. And, at pin 8 has voltage is about 0V.
Then, the operating of the circuit will restart same the first again.
And, both current get out of pin 8 and pin 10 will be combined at C6.
This makes the output voltage to rises up to 2 times of input. Because the voltage of pin 8 and pin 10 are the input mixes together.
The capacitors C1 through C4 acts as square wave generator about 5 kHz. To determined working of IC1.
Building, Testing, and Application
When we get fully equipped, and build PCB as Figure below. And then, soldering equipment as Figure.
component-layout of the 12V to 24V step up converter circuit using TDA2004
After examining the faulty circuit. Then test them with 12V battery at the input and measure voltage output will have about 22V. Please watch a video below.
If you have a 6V input. It can increase the output voltage is 12V. Or, enter the input is 12V, the output is about 24V.
Really, We can enter the input voltage of 5V to 12V. It does not should more than 18V.
Parts you will need
Resistors 0.25 watts
Non polar capacitors such as Ceramic, Mylar , polyester
C1, C3—0.0047uF 50V
C2, C4—0.022uF 50V
C8, C9, C10—0.1uF 50V
C5, C7—2200uF 25V
LED—5mm color as you like.
Others part, PCB, Heatsink, etc.
Note: Also this you can see these: 12V to 40V DC converter
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