Source: https://www.electronicdesign.com/technologies/communications/article/21799727/simple-circuit-communicates-over-lowvoltage-power-lines Sometimes a circuit requires a data link over an existing cable that doesn’t have any free conductors for a dedicated comm link. A common solution is to superimpose a high-frequency carrier modulated by the data onto a power-supply …

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Source: http://www.theorycircuit.com/12-volt-gel-cell-battery-charger-circuit/ Simple 12 volt gel cell battery charger circuit constructed by using few easily available components. This circuit can charge gel cell battery with reverse current and overcharging protection. We know a Gel cell battery is a VRLA (valve …

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