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The stabilized "B5-44A" power source has been manufactured since 1990. The power source "B5-44A" is used to stabilize the direct current or voltage (depending on the set mode). Switching between modes in the PI is automatic, without user intervention. On the front panel of the power supply under the slot, a potentiometer is displayed, by means of which the output voltage is limited. The PI also implements the setting of the output voltage and current by an external analog voltage of negative polarity. Stabilization of voltages and currents at the output in the power source is carried out by a linear regulator. The voltage or current is set from the front panel by a two-turn potentiometer and monitored by an integrated digital voltmeter.