Click here to go to UPSCALE home page.
Click here to go to I Year Lab home page.

You can jump directly to a section of this specification sheet by selecting an item below and clicking the left button.

POWER SUPPLY


[image]

Manufacturer: CRI (Canadian Research Institute) Toronto
Model: TRP-25-0.25
Cost: $64 (1969)


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.



Specifications
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%.
Ripple (superimposed AC on the dc voltage) is less than 2 mV.
Short circuit current 350-450 mA.



Click here to go to the top of this page.

Operating Instructions


  1. Connect output terminals to the load, observing polarity markings (Red is positive).
  2. Make sure unit is turned off. (Output voltage control counterclockwise until it clicks).
  3. Plug in line cord to 120 V 60 Hz outlet.
  4. Turn up voltage to desired level.

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).


Precautions

Be careful of circuits with other power sources in them, which might force reverse currents or excessive AC or DC currents through the unit.


Click here to go to the top of this page.

keywords: current source, electrical source, voltage source.

Document created Circa 1969. Original author: Unknown.
Last updated 06/27/96. Revised by David Harrison.