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:
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.
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