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  • sid555 commented on abo_hosni's instructable DIY LED Tachomter (RPM gauge)12 months ago
    DIY LED Tachomter (RPM gauge)

    instead try connecting those terminals to battery and add a seperate key for the tach.. that would be simple!

    that would we make your entire circut less reliable. the voltage drop would not be absorbed easily in 555. LM2917 regulates a potential of 9v and your source is 12v. so always LM2917 is prferable.

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