Dual channel train model variable power supply

trainpsI’ve built this for a friend. It’s a variable voltage stabilizer with dual indipendent outputs from 0 to 12 Volts, up to 1 Ampere each channel.

Each output have a switch to choose the output polarity and a potentiometer to set the output voltage. A trimmer on the circuit sets the maximum voltage for each channel.

This circuit uses the L272M dual power operational amplifier in a bridge configuration to switch polarity, so a single pole switch can be used to change train direction.

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