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I am making half adder circuit for my school project but I saw their datasheet and it says maximum supply volate is 5.25v and I have 9v battery, How do I use it if I want to test my circuit without burning ICS? I watched this video to complete my project but he didn't specify the battery he used. Pls help Video link -: https://youtu.be/rNG_KD1hfpc. Thank you IC I used : Ic 7408(SN74LS08N) , IC 7432 (SN74LS32N), IC 7404 (SN74LS04N) . thank you

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    \$\begingroup\$ Google "Voltage Regulator". \$\endgroup\$ Dec 31 '16 at 14:07
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    \$\begingroup\$ In fact the first answer to this question should tell you all you need to know: Reducing voltage with resistors. Took all of 10 seconds to find using the search box at the top. \$\endgroup\$ Dec 31 '16 at 14:08
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For low power load applications (such as your case) you could use voltage regulator https://www.soselectronic.com/productdata/17/71/6/17716/L78S.pdf

For more demanding devices use switching step-down regulator https://www.soselectronic.com/productdata/93/80/4/93804/ltc1767.pdf

Take the links as example only.

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Instead of building a power supply to convert 9V to 5V, there are other alternatives. You can get a 5v wall mount PS at your local supermarket for about $10. That is, don't use batteries, but, if you must, your circuit will probably work with three 1.5 volt batteries in series. A real longshot solution would be to use different ICs. The original 4000 series CMOS ICs worked with Vdd 5 to 15 volts and many types are still available. They might be hard to find, and they probably would have different pinouts.

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