Description
Power supply, direct current, variable 0-25
volts at up to 250 mA, voltage regulated with current
limiting to prevent damage on overloads, with voltmeter.
Voltage | will remain constant to within 0.3% when load current changes from 0-250 mA or within ±0.1% when the line voltage changes ±10%. |
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Ripple (superimposed AC on the dc voltage) | is less than 2 mV. |
Short circuit current | 350-450 mA. |
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Hints Always turn voltage up slowly from zero on a new circuit. If the voltage on the meter does not rise, or stops rising as the output voltage control is turned up, this indicates that the circuit is calling for an overload current and is probably defective.
Principle Line voltage (120 V, 60 Hz) is transformed and rectified to low voltage direct current. A transistor circuit is then employed to regulate the output voltage to the level called for by the output control, irrespective of the amount of current being drawn, as long as it is less than 250 mA (e.g. if the output is short circuited a current control reduces the output voltage so as to prevent damage to internal and external circuits).
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