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The B & K-Precision Model 1651 Triple Output DC Power supply is a high quality, general purpose dc power source. It provides two supplies with a 0-24 volt dc output and one with a fixed 5 volt dc output. The 0-24 V supplies are adjustable and are capable of current output of 0-0.5 amp. The fixed 5 V supply has a current output of 0-4 amps, allowing it to handle extensive digital logic circuitry. Two panel mounted meters can simultaneously monitor the output current and output voltage of either of the 0-24 V supplies. The two 0-24 volt supplies can be operated independently or in one of two tracking modes. In the series tracking mode, the “B” supply tracks the voltage of the “A” supply. In the series tracking mode the “A” and “B” supplies are connected in series, allowing a single output of 0-48 V at up to 0.5 amp. In the parallel tracking mode, the two supplies are connected in parallel, allowing a single 0-24 V output at up to 1 amp. Both 0-24 volt supplies may be used in constant voltage or constant current applications. The crossover from constant voltage to constant current modes is smooth and automatic. LED’s indicate the Constant Current mode of operation. In constant voltage applications, a current limit may be preset. When load variations cause the current to reach the preset limit, the unit then regulates output current rather than output voltage. Current limits are adjustable from 6% to 100% of maximum. In constant current applications, the maximum voltage may be preset. When load variations cause current to drop below the regulated value, the unit reverts to regulated voltage operation at the preset value. The fixed 5 V supply is ideal for powering digital logic circuitry. The 0-4 amp capacity allows the supply to be used for large circuits. Built-in overload protection automatically limits the current output to a maximum of 4 amps. An LED indicator lights when the supply is overloaded. The Model 1651 exhibits excellent regulation and low ripple characteristics. The circuit design incorporates a pre-regulator, which greatly reduces internal power dissipation at low output voltages. Reverse polarity protection prevents accidental damage to the Power supply from improper connection to an external voltage, and current limiting protects the equipment being powered, as well as the Power supply. The output is isolated from chassis and earth ground, which permits full flexibility of connections. When needed, the (+) or (-) polarity may be strapped to ground, or either polarity may be floated to an external voltage. Additionally, the two 0-24 volt supplies can be used as a “split supply” with two positive voltages and a common negative, two negative voltages and a common positive, or one positive, one negative, and a common. All of these configurations can be used with either matching (tracking) or differing (independent) voltages. The features and versatility of the unit, especially the triple output and tracking features, make it an ideal general purpose Power supply for engineering lab applications. It can serve as a single or multi-voltage power source, including the bias supply, for breadboard and prototype TRIPLE OUTPUT Operates as three separate power supplies. Each has floating output and is completely isolated from the other two. ONE FIXED 5 V SUPPLY 0-to-4 amp fixed 5 volt supply is ideal for use with most digital logic circuitry. Adequate current capacity for extensive circuitry. TWO 0-24 VOLT SUPPLIES “A” and “B” supplies are continuously variable over 0-to-24 volt range. Each supply has a 0.5 amp current capacity. UNIQUE TRACKING FEATURE The two 0-to-24 V supplies can be operated so that the “B” supply tracks the “A” supply. Outputs can be strapped for two positive voltages with a common negative, two negative voltages with a common positive, or one positive and one negative with a neutral common. SINGLE 0-48 V SUPPLY Series tracking feature allows use of “A” and “B” supplies as one 0-to-48 V, 0.5 Amp Supply. SINGLE 0-24 V 1 Amp Supply Parallel tracking feature allows use of “A” and “B” supplies as a 0-to-24 V supply with a 1 amp current capacity (through “A” output terminals). CONSTANT VOLTAGE OR CONSTANT CURRENT The “A” and “B” supplies provide regulated dc voltage output or regulated dc current output. Crossover is smooth and automatic. METERING Two, easy-to-read analog meters monitor output voltage and output current of the “A” and “B” supplies. Use of two meters allows simultaneous current and voltage metering when using “A” and “B” supplies in tracking or independent operation. LABORATORY QUALITY Excellent regulation, low ripple. LED INDICATORS Identify mode of operation. PRE-REGULATOR Limits internal dissipation for higher reliability and efficiency.