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0.6V to 6V/12V Boost Converter Circuit

0.6V to 6V/12V Boost Converter Circuit

In this post we learn how to make a 0.6V to 6V or 12V boost converter circuit using a single chip MC74VHC1G14, which uses under 1V to operate.

About the IC MC74VHC1G14

Normally, we all know that a silicon transistor would find it difficult functioning below 0.7V, unlike germanium counterparts which are capable of doing it with ease, however nowadays we don't often hear about these devices which have become quite obsolete with time.

The circuit discussed here uses an inexpensive Schmitt trigger NOT gate MC74VHC1G14 from the 74XX TTL  family which are designed to work with voltages well below 0.6V, to be precise even with as low as 0.45V. The device we employ is manufactured by Motorola.

The presented 0.6V to 6V boost converter circuit can be even modified to achieve upto 12V from a 0.6V source.

Referring to the figure below, we see a rather straightforward set up consisting of an oscillator stage using a single NOT gate inverter module as discussed above.

Circuit Operation

This NOT gate is very special since it's able to oscillate even at voltage as low as 0.5V which makes it very suitable for the present 0.6V to 6V or 12V boost converter application.

The oscillation frequency here is determined by R1 and C1 which is calculated to be around 100kHz.

The above frequency is fed to the base of an NPN transistor for the required amplification.

C2 makes sure the two IC and the BJT stages are kept isolated from direct contact in order to avoid the low input voltage from dropping below 0.5V

R2 and thee schottky diodes D1 keeps the BJT sufficiently biased for helping an optimal oscillatory response for the transistor.

D2 is another schottky diode which is introduced to keep the charge from C3 disconnected during the switch OFF periods of Q1 otherwise the stored charge inside C3 could get discharged or shorted via Q1.

The IC 7806 at the output is to maintain a fixed 6V irrespective of the boost level created by L1 and the associated converter stages.

L1 must be wound strictly over a ferrite core. The dimension and data of the coil is a matter of some trial and error or it may be procured as a ready made unit for the same.

Circuit Diagram


About the Author

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!

32 thoughts on “0.6V to 6V/12V Boost Converter Circuit”

  1. Hi,
    I would like a circuit to optimise the power of NiCad cells to drive Ultra Bright Leds.
    I have 3 cell Nicad packs rated at 3.6V which I’d like to use to drive the Ultra Bright Leds.
    To optimise the power available in the NiCad cells, I’d like the cells to continue to drive the Leds with a constant current as the cells voltage drops below the Ultra Bright Leds rated voltage.
    I was considering a Joule Thief Circuit or Voltage Doubler feeding a Constant Current circuit.

    Any suggestions/circuits please ?

  2. Hi swagatam
    which battery do you recommend to be use in the Vin? can we use wrist watch battery 1.5V input if size is of utmost important in a given project? thanks alot.

    • Hi Abba, you can try any type of battery, size is not important but the output current will be as per the AH rating of the battery and proportionately reduced depending on boosted value of the output voltage

  3. Hi Swagatham,

    I want a 24VDC to 48VDC boost converter.
    I got a 24DC battery as the voltage source.
    How can I build one. Please suggest.

  4. What is the number of turns it takes to the coil around the ferrite. If I use 6 v to the entered, what would be the output voltage of the circuit.

    • for 6V you can use any 555 based boost converter, this circuit is recommended only voltages lower than 2V

      you can also try a joule thief circuit for the same.

  5. Hello. Thanks for the reply. I would like to have a precision compared to al voltage input and sortie.de more I see + 0.5 v at the top of the schema.le less will be connected where.

  6. Hello,
    do you have any recommends for a similar IC ?
    I dont can find and get this IC on a cheap way. Do you have any recommends, does it need to be a Very High Speed CMOS?

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