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The power supply demonstration "IPD-1" was produced presumably since 1967. The power source is designed to power various electrical circuits and devices used in conducting demonstration experiments in physics lessons in a secondary school and / or in other educational institutions. The magnitude of the regulated voltage is 0 ... 12.6 volts - controlled by a voltmeter mounted on the front panel of the case. On the same panel there is a regulator of the output voltage regulator, a toggle switch for switching on the device, an indicator of connection to the power grid and an indicator of the overload of the stabilized output. The overload indicator is triggered when the load current exceeds 2 A.