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 1MΩ 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 18kΩ resistors form a voltage divider.
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 150Ω resistor limits the current
in the LED to about 30mA.
Figure 9
-9-
WARRANTY POLICY
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).
Elenco Electronics, Inc. Service Department
150 W. Carpenter Avenue Wheeling, IL 60090
Input
Vcc
150
LED
18k
18k
1
16
215
314
413
512
611
710
89
Symmetry
ADJ.
Waveform
ADJ.
Ground
Sync
Output
Bypass
FKS
Input
Timing
Resistor
Timing
Capacitor
V+
Mult. Out
Sine/Saw
Output
AM Input
+1
Multiplier
and
Sine
Shaper
VCO
Current
Switches
Figure 8
(16 pages)
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