Warranty Policy - Elenco Electronics XK-150 Instruction Manual

The XR-2206 is comprised of four functional blocks, a voltage
controlled oscillator (VCO), an analog multiplier & sine shaper, a
unity gain buffer amplifier and a set of current switches.
The VCO actually produces an output frequency proportional to
an input current. Across pins 5 and 6, two timing capacitor are
switched between to give different frequency ranges. On pin 7,
the 1M variable resistor controls the actual frequency output.
These two components form the RC time constants for the
oscillator frequency.
The VCO produces a square wave signal. This square wave is
sent to a shaper and converted into a sine wave.
THE LOGIC INDICATORS
There are eight logic indicators. Figure 9 shows the circuit. It consists of a
transistor, LED, and three resistors. The two 18k
When the input is over 1.4V, the transistor will turn on allowing current to flow
through the LED to ground, thus turning it on. The 150
in the LED to about 30mA.
Your XK-150 Digital / Analog Trainer has been tested and conforms to our rigid requirements on performance and durability. It is
guaranteed to be free of defects in workmanship, materials and construction for a period of 2 years. If this product should fail during
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.
When returning merchandise for repair, please include proof of purchase, a brief letter of explanation of problem and sufficient packing
material. Before returning any merchandise, please call our service department at (847) 541-3800 to obtain a return authorization
number (RA).
resistors form a voltage divider.

WARRANTY POLICY

Elenco Electronics, Inc. Service Department
150 W. Carpenter Avenue Wheeling, IL 60090
-9-
AM Input 1
Sine/Saw
2
Output
3
Mult. Out
4
V+
5
Timing
Capacitor
6
7
Timing
Switches
Resistor
8
resistor limits the current
16
Symmetry
ADJ.
15
+1
Multiplier
and
14
Sine
Waveform
Shaper
ADJ.
13
12
Ground
VCO
Sync
11
Output
10
Bypass
Current
9
Input
Figure 8
Vcc
Input
18k
18k
Figure 9
FKS
150
LED