Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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Inverter (CB15728E)
This circuit synthesizes a sinusoidal signal from logic pulses that can be obtained from an...
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With the light falling on the LDR, the relay closes its contacts by activating a warning system. The...
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This circuit was found in old English documentation. It can be improved by using resistors of...