POWER SUPPLY MODELS XP-660 / XP-760 Variable Regulated Model XP-660 Model XP-760 Instruction Manual Elenco Electronics, Inc. ® Copyright © 2005, 1990 by Elenco® Electronics, Inc. All rights reserved. Revised 2005 REV-H No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
Specifications for Model XP-660 @ 120VAC input Input Voltage Output Voltage Output Current Load Regulation Line Regulation Ripple RMS Current Protection Short Protection Output Impedance 0-20V Supplies 5V Supply 110-135VAC 60 Hertz 0-20VDC Variable 0-1A over 0-20V range Less than .1V over 0-20V range Less than .1V 110V to 130V Less than 5mV .05 to 1A Variable current limiting .05 to 1A current limit .1 ohms Same 5VDC + .1V 0-5A Less than .15V Less than .
Circuit Description The Elenco® XP-660 and XP-760 use the same basic power and regulator circuit. The only difference is in the display function. The XP-660 has two 0-1mA analog meters. These meters convert to a voltmeter by placing a 20kΩ resistor in series or an ampmeter by placing a .39Ω shunt resistor across the meter. When referring to the schematic diagrams, the circuit components associated with each supply can be identified by its number. The 5V supply begins with 100.
5V Regulator Timing for the overall operation of the A/D converter is derived from a 40kHz external oscillator. The IC divides this frequency by four and the resulting clock pulses are used to drive its decade counters. It is then further divided to form three convert-cycle phases. The final readout is clocked at about 2.5 readings per second. The circuit of the 5V regulator is shown on the schematic with components beginning with number 100. The heart of the regulator is IC1.
Counter Output Figure 3 Dual Slope A/D Converter Operation Instructions Elenco® Models XP-660 and XP-760 are extremely versatile power supplies. All supplies are completely isolated from each other. This means that they have separate grounds. By tying the ground terminal of one supply to the positive terminal of the other, you can obtain an output of 040V @ 1 ampere. Also by stacking the 5V terminal you can increase the output to 45V. 1) Check the voltage rating of the equipment to be powered.
Safety Precautions Variable 0-20VDC Regulator Calibration Certain safety procedures must be observed when this power supply is used with external circuits that are connected to AC power lines. There is always some danger when working with electrical equipment or circuits that operate at hazardous voltages. You should thoroughly familiarize yourself with the equipment before working on it. High voltage may appear at unexpected points in defective equipment.
Parts List XP-660 Qty. Description Part # Qty. Description Resistors 2 2 2 4 2 4 3 4 2 2 2 1 2 3 1 2 2 3 2 2 R105 R213, 313 R210, 310 R208, 209, 308, 309 R211, 311 R202, 203, 302, 303 R101, 222, 322 R206, 214, 306, 314 R201, 301 R205, 305 R215, 315 R102 R217, R317 R103, 204, 304 R104 R216, 316 R218, 318 VR101, 202, 302 VR201, 301 R203, 303 Miscellaneous .14Ω 5% 5W .39Ω 5% 2W 68Ω 5% 1/4W 200Ω 5% 1/4W 270Ω 5% 1/4W 470Ω 5% 1/4W 1kΩ 5% 1/4W 1.2kΩ 5% 1/4W 1.2kΩ 5% 1/2W 2kΩ 5% 1/4W 3.
Schematic Diagram XP-660 -7-
Schematic Diagram XP-760 -8-
Parts List XP-760 Qty. Description Part # Qty. Description .14Ω 5% 5W .39Ω 5% 2W 68Ω 5% 1/4W 100Ω 5% 7W 200Ω 5% 1/4W 270Ω 5% 1/4W 470Ω 5% 1/4W 910Ω 5% 1/4W 1kΩ 5% 1/4W 1.2kΩ 5% 1/4W 1.2kΩ 5% 1/2W 1.5kΩ 5% 2W 2kΩ 5% 1/4W 3.3kΩ 5% 1/4W 10kΩ 5% 1/4W 22kΩ 5% 1/4W 27kΩ 5% 1/4W 100kΩ 5% 1/4W 1MΩ 5% 1/4W 200Ω Pot LD 5kΩ Pot SU 10kΩ Pot SU 200Ω Pot Panel 10kΩ Pot Panel .
WARRANTY POLICY All of our instruments have been tested and conform to our rigid requirements on performance and durability, they are guaranteed to be free of defects in workmanship, materials and construction for a period of 2 years. If this product should fail in normal use within the first 3 months from the date of purchase, Elenco® will repair or replace the unit at no cost. For the remainder of the warranty period, a nominal service charge is required to cover shipping and handling.
Elenco® Electronics, Inc. 150 Carpenter Avenue Wheeling, IL 60090 (847) 541-3800 Fax: (847) 520-0085 Web site: www.elenco.com e-mail: elenco@elenco.
