Elenco Electronics XK-700-SEMI, Сборка и инструкция по эксплуатации

Страница: 2 / 40

INTRODUCTION
The XK-700-SEMI Digital/Analog Trainer is basically divided into four sections: Bredboard, Power Supply,
Analog and Digital. The bredboard was sent to you in an earlier kit. The PC board that contains the majority of
the circuits has come to you preassembled - HANDLE IT CAREFULLY as parts can be broken or moved and
could cause the circuit to malfunction. Follow the instructions carefully and perform all tests required. When
the assembly of the trainer has been completed, you will do a resistance and voltage analysis. If problems
occur, the troubleshooting chart at the end of each section will be helpful. After the Power Supply has been
established as functioning correctly, you will analyze the Analog Section even though it was preassembled. That
confirms that the circuit is functioning properly when it is powered up. The same procedure will be followed up
when checking the Digital Section.
POWER SUPPLY
The XK-700-SEMI has five built-in power supplies which will satisfy most design needs. This includes two
variable power supplies giving up to +20 volts and -20 volts at .5 amp. Below 15V, the current available is 1
amp. Three fixed power supplies give you +12VDC, -12VDC or +5VDC at 1 amp each. These fixed voltages
are the most commonly used voltages for design work. All supplies are regulated to within 150mV. This means
that you can increase the current draw from no load to .5 amp and the voltage will change less than 150mV. All
supplies are also short circuit protected by using integrated circuit regulator devices.
ANALOG TRAINER SECTION FUNCTION GENERATOR
The analog trainer contains a complete function generator capable of producing sine, square and triangle
waveforms. The frequency of the generator is continuously variable from one hertz to over 100,000 hertz in five
steps. A fine tuning control makes the selection of any frequency easy. The output voltage amplitude is variable
between 0 to 15Vpp. The output impedance is approximately 330 ohms.
DIGITAL TRAINER SECTION
The digital trainer has the necessary functions to do your digital experiments. They consist of a clock generator,
two no-bounce switches, eight LED indicator lamps and eight data switches.
POWER SUPPLY SPECIFICATIONS
Power Supplies:
• +1.25V to 20VDC @ .5 amp (1.25V to 15V @ 1 amp).
• -1.25 to -20VDC @ .5 amp (-1.25V to -15V @ 1 amp).
• +12V +5% @ 1 amp.
• -12V +5% @ 1 amp.
• +5V +5% @ 1 amp.
• 30VAC center tapped @ 1 amp.
• Load regulation - all DC supplies less than .2V no load to .5A.
• Line regulation - all DC supplies less than .2V 105 to 135V.
• Hum and ripple - all DC supplies less than .01V RMS.
• Short protection - all DC supplies-internal IC thermal cutoff.
• Fuse 1.25A 250V.
Variable Resistance (undedicated):
• 1k
Ω
Potentiometer
• 100k
Ω
Potentiometer
Bredboard
- 2 bredboards containing 1,560 tie points.
USERS DESCRIPTION OF FRONT PANEL CONTROLS
1) On/Off Switch - Allows power to be applied to all outputs. Switch will
light when on.
2) Fuse Holder - Easy access for replacement of 1.25A fuse.
3) Power Output Terminals - This provides 30VAC center-tapped at
15 VAC; also provides output terminal for positive and negative
variable voltages.
4) Variable Positive Voltage Control - Varies positive voltage from 1.25
to 20V at indicated output connector pin.
5) Variable Negative Voltage Control - Varies negative voltage from
-1.25V to -20V at indicated output connector pin.
6) Output terminals for 1k and 100k undedicated potentiometers.
7) 1k
Ω
undedicated potentiometer.
8) 100k
Ω
undedicated potentiometer.
-1-
1
2
3
4
5
6
7 8