Voltage Converter Circuit – 6 to 12 volts

One of our valuable readers asked us about any other application of the Audio amplifier IC TDA2003. Well, it can be used to build a Voltage converter circuit. Here’s an example of 6 to 12 volts converter using the same IC

Description of the Voltage converter circuit:

Two TDA2003 ICs are used here which are wired as oscillators and their outputs are identical but 180 out of phase. Capacitors C3 and C6 determine the frequency of these oscillators respectively. When the output of IC1 is low capacitor C1 charges to the supply voltage through diode D2. When the output of IC1 goes high, this voltage also gets added to the C1. Now the output of IC2 will be low, diode D1 will be forward biased and the capacitor C2 will be charged by the voltage across C1.

A series voltage limiter circuit using transistors and a Zener diode is added at the output stage in order to prevent overshoots in the output voltage. With the present configuration, the theoretical output voltage will be around 14 volts. Capacitor C8 is the output filter and capacitor C5 is the input filter.

Voltage Converter Circuit diagram:

Voltage converter circuit -6 to 12 volts - using TDA2003
Voltage converter circuit diagram

Notes on Voltage converter circuit:

  • IC1, IC2 and Q2 require a heat sink.
  • The circuit can be assembled on a Vero board.
  • Input voltage should not exceed 8V.

Check our Other Power Supply related Circuits:

1. 12 Volt Boost Regulator

2. 5 Volt Buck Regulator

3.  3 to 5 Volt Converter

4.  12 Volt and 5 Volt Combo Power Supply

5.  High & Low Voltage Cut off Circuit

Check our category on Power Supplies for more circuits and articles.



  1. sir plz gv brief explanation.and plz put in the language like those people studied telugu medium upto intermediatelevel,he can also understand about that circuit within a few minutes thanking you sir

  2. sir thank you for understanding the student difficulties while searching the circuits like this.BUT IHAVE A SMALL SUGESSION PLEASE ..I THINK CLEAR EXPLAINATION FOR CIRCUIT WORKING IS SOME WHAT REQUIRE…THANK FOR THIS OPPURTUNITY.

  3. thanks! now i got at least one application of tda 2003 other than amplification . i am also in search of some other 3-4 applications of TDA2003