Jameco Part Number 20685

(JE2206)

Function Generator Kit

GENERAL DESCRIPTION

The 20685 (JE2206 Function Generator Kit) is a single-board assembly incorporating the basic circuit necessary for a sine, square, and triangle wave generator, of high stability and accuracy that may be amplitude and frequenc y modulated. The k it is intended to be incorporated into a higher as sembly of the user's own design that adds power sup ,

•

Operati ng from either a +12VDC or +/-

6VDC @ 15mA power source

•

Freque ncy capability: +1 to 100KHz in 4 ranges

•

Frequency variability: 1:100 within each range

• Frequency accuracy dependent upon timing capacitors and user's potentiome ter

(calibration by user)

• Sine / triangle output amplitudes variable,

0 to 6Vp-p for sine and 0V to V +/- for triangle, with 600Ω source impedance

•

Maximum sine wave distortion: 1% 10

10kHz; and 3% 10 to 100kHz

to

•

Linear freque ncy modulation capability range dependent on center frequency

•

Linear amplitude modu lation capability, range

• Oth er

55dB

criteria as determined by Exar 2206 functi on gen erato r IC

Component Part

Reference Numb er

IC1 34972

Descrip tion Qty.

C1, C2, C7

C3

C4

C5

C6

R1

R2

R3, R7

R4

R5, R6

R9

R10

R11

10882

27001

26956

26884

26833

691219

691340

690865

691091

691032

42981

42964

35511

134341

20706

IC Function Generator

XR2206

Electrolytic Capacitor,

AXIAL, 10uF @ 50V

Mylar capacitor, nonpolarized, 1uF @ 100V

(1K)

Mylar capacitor, nonpolarized, 0.1uF @

100V (104)

Mylar capacitor, nonpolarized, 0.01uF @

100V (0.01)

Mylar capacitor, nonpolarized, 0.001uF @

100V (102)

1

3

1

1

1

1

1/4W Resistor, 30k

(orange-black-orang e)

1/4W Resistor, 100k

(brown-black-yellow)

1/4W Resistor, 1k

(brown-black-red)

1/4W Resistor, 9.1k

(white-brown-red)

1/4W Resistor, 5.1k

(green-brown-red)

1

1

2

1

2

(orange-black-brown)

1

Potentiometer, 1M (105) 1

Potentiometer, 1k (102) 1

Potentiometer, 25k (253 ) 1

22AWG black hook up wire

1

JE2206-1 PC Board 1

Assembly 1

External Com ponen ts

R12 255434

R13

S1

S2

255469

101574

22833

Potentiometer, 50k Pane l

Mount

Potentiometer, 1M Panel

Mount

Rotary switch, 1 layer,

2P6P

SPDT mini toggle switch, MTS-102-F1

1

1

1

1

Recommended power supply kit if using a split power supply configuration:

Jameco Part Number 20626 (JE21 5) -

A djustable power supply kit.

Ass embly Preparation and Procedures:

1) Important: identify all parts on par ts list before proceeding. If you are having difficulties in identifying the parts visually, suggest that you use a mu ltimeter that can meas ure capacitance, resistance, voltage. Measure the components accordingly.

2)

3)

Suggestion: simulate board assembly by placing the components in their actual place on the picture assembly, then transfer the components to the act ual board for soldering assembly. (see figure

1 for scanned board assembly)

Tools required: small soldering iron 27W to 35W; resin core solder (0.03" diameter with SN60 or SN63); small sponge (water dampened) for cleaning solder tip; s mall wire cutter/stripper; small long nose p liers; small screw driver; multimeter for measuring voltage, capacitance, and resistance .

Sol dering Tips:

1) Feed the solder to the crack between the

2) iron tip and the solder pad next to the component lead.

Leaving the iron tip too long on a pa d will cause the pad to life, as w ell as damage the component. Allow approximately 2 seconds per solder joint.

3) Using too much solder can cause the solder to bridge across traces and pads.

4) Keep iron tip clean by wiping iron across water dampened sponge -- frequently.

Assembly Instructions:

R EAD ALL INSTRUCTIONS BEFORE

STARTING!!!

Before assembly, determine if a split power supply or a single power supply will be used, as placement of R12 potentiometer will change ( with an addition of a jumper wire across the output v oltage nodes - please see figure 3 for single power supply and figure 4 for sp lit power supply.

Pri nted wiring board assembly

1) Start the board assembly by placing the

2) printed circuit board to the position sho wn on figure 1 and figure 2

Insert resistors R1 through R8 into the board. Observe the color code of each resistor as you install them (color code is stated in the parts list for each resistor. If uncertain, measure the resistors with your multimeter and label them accordingly).

Bend the leads at t he bottom of the PCB board to contain the resistors, solder an d

3)

4)

5)

6) clip excess leads.

Insert IC1 into board. Be sure that th e notch at the end of the IC is l ocated properly as shown for pin number 1 identification (see figure 2).

Insert potentiometers (adjustable re sistors)

R9, R10, and R11 as shown (see figure 2 ).

Resistors R9 and R10 will require spreading of the leads to match the hole spacing on the board. R11 requires matching the a djustment knob aligned to the small rectangular shape (see figure 2).

Solder leads.

Insert capacitors C1, C2, and C7 into the board. Note that the leads are polarized and must be placed as shown (see figure

2). Ben d leads at the bottom of the PCB to contain capacitors, solder, and clip excess leads.

Insert capacitors C3, C4, C5, and C6. The capacitance values are marked on the

components as shown in parenthesis ( see parts list) C3 = 1uF (1K); C4 = 0.1uF

(104); C5 = 0.01uF (.01); C6 = 0.001uF

(102) if uncertain use your multimeter to measure capacitance and label accordingly). Bend leads at the bottom of the PCB to contain capacitors, solder, and clip excess leads.

Final Assembly Checkout:

Do not attempt to apply power to the board until a final check has been made to verify correctnes s of all assembled components. Component IC1 will be damaged if placed incorrectly. Board w ill malfunction if capacitors C1, C2, and C7 are n ot properly placed on the PCB for polarity.

Capacitors will be dama ged after short usage.

E rratic signal patterns will result from incorrect p lacement of resistors.

Operationa l Considerations:

1. The schematic diagram (see schematic) shows the components supplied with the JE2206 (J ameco

Part Number 20685) and noted on the same page the external components such as R13 (1M ohm) potentiometer for frequency adjustment, S1 (rotary switch) for frequency range selection), S2

(toggle switch) for wave selection, and R12 (50k) potentiometer for amplitude (connection will di ffer if using a single supply operation see figure 3 and split supply operation - see figure 4). Other components such as power supply and enclosure are to be supplied by the user. In addition, setting u p the function generator kit will require a digital counter for frequency calibration and a general purpose oscilloscope for th e calibration of sine wave output wave forms and amplitude adju st.

2. The controls:

2.1 S1 (rotary switch external- frequency range) position 1: 1 to

100Hz range; position 2: 10Hz to 1 kHz range; posi tion 3 - 100Hz to

1 0 kHz range; position 4: 1 kHz to

100 kHz range

2.2 S2 (toggle switch external) wave shape - open for triangle wave; closed for sine wave

2.3 R9 (1M ohm potentiom eter)

DC offset, adjust for 0VDC output-offset voltage

2.4 R10 (1k ohm potentio meter) sine wave distortion.

Minimizes harmonic distortion, adjust with R11

(25k ohm potentiometer)

2.5 R11 (25k ohm potentiometer) sine wave symmetr y, optimizes symm etry. Adjust with R10 (1k ohm potentiometer)

2.6 R12 (50k ohm potentiometer, panel mount external component) output am plitude, sets amplitude of sine wave or triangle wave output

2.7 R13 (1M ohm potentiometer panel mount external component) frequency, varies frequen cy of output signal approximately 1:100 on each range

3. Capacitors C3, C4, C5, and C 6 are

+/-5% mylar capacitors as

4.

5.

6.

7.

8.

9. supplied. For more accurate matching of potentiometer dialcalibration between ranges, and/o r for greater stability, the user may substitute other capacitors of the same nominal capacitances.

PRECAUTION: keep the lead length short for the range selector switch (S1 rotary switch)

The JE2206 (function generator kit) is designed for 12V or +/6V operation but will operate up to a maximum of 26V or +/-13V.

Whatever supply is used, take care to obse rve correct polarity as otherwise, damage to the IC may result

The sine / triangle output (terminal

P) amplitude is varied by R12

(50k potentiometer panel mount).

The output impedance is 60 0 ohms. The square wave (SYN C) outputs are derived from a grounded-emitter transistor collector connecting within the I C to terminal M. Sync-current at this terminal should not exceed that which will pull the LOW voltage higher than 0.5V above gr ound.

Applied voltage at terminal I for the purpose of frequency modulation or sweeping should be limited to a maximum of +/-3V about the open-circuit potential of

+3V. The voltage-to-frequency factor is about 0.00032/CuF Hz/V where C is the particular timing capacitor connected to S!.

Linear amplitude modulation will occur for input voltages at ter minal

Q between +/-4V about V+/2. Th e phase of the output sig nal is reversed and its amplitude goes through zero at V+/2

Adjust the DC offset of the sine / triangle output with R9 (1M ohm potentiometer). Adjust for minimum sine-wave distortion with R10 (1k ohm po tentiometer) and R11 (25k ohm potentiomet er) alternately adjusted

10.

SYNC output: the sync output provides a 50% duty cycle puls e output with either full swing or upper half swing of the power supply voltage depending on th e choice of sync ou tput terminals on the printed circuit board ( see

11.

figures 3 and 4 )

Frequency Modulation (external sweep): frequency can be modulated or swept by applying an external control voltage to sweep terminal (terminal I). When not in use, this terminal should b e left open-circuited. The open circ uit voltage at this terminal is approximately 3V above th e negative supply voltage and its impedance is 1000 ohms.

12.

Amplitude Modulation (AM): the output amplitude varies linearly with modulation voltage applied to

AM input (terminal Q). The output amplitude reaches its minimum as the AM control voltage approach es the half of the total power supply voltage. The phase of the output signal reverses as the amplit ude goes through its minimum valu e.

The total dynamic range is approximately 55dB with AM control voltage of 4V referenced to the half of the total supply vol tage.

When not in use, AM terminal sho uld be left open-circuited

ADJUSTMENT

To adjust for minimum distortion, connect the scope probe to the triangle / sine wave output.

Close S2 (toggle switch) for sine wave outpu t and

adjust the amplitude control to give non-clipping maximum swing. Then adjust R10 and R11 alternately for minimum distortion by observing the sinusoidal waveform. If a distortion meter is available you may use it as a final check on the setting of sine-shaping trimmers. The minimum distortion obtained in this manner is less than 1% fr om 1Hz to 10kHz and less than 3% over the entire frequency range.

For further information on the operation of

XR2206 IC, please refer to the datasheets found on the webpage of Jameco Part Number 20685

(function generator kit). For pin-configura tion of S2 (toggle switch) refer to our website with t he part number 22833, and for the S1 (rotary sw itch) pin configuration refer to our website w ith the part number 101574.

P art Number 20685 (FUNCTION

GENERATOR KIT)

Important disclaimer: to the fullest extent permitted by applicable law, Jameco expressly disclaims the implied warranty of fitness for a particular purpose. Customer should understand that Jameco does not may any representation tha t products purchased will suit customer's particular purpose. Customer must rely on customer's own skill or judgment in selecting suitable products fo r customer. To the extent any impl ied warranty is a pplicable such warranty shall be limited to 90 days from the date of purchase.

Limitation of liability: Jameco's liability shall be limited to the repair or replacement of defect ive products in accordance with the Jameco Limited

Warranty. Jameco shall not be liable for ay incidental, special, or consequential damages for breach of any warranty, expressed or implied, directly or indirectly arising out of Jameco's sa le of merchandise, including any failure to deliver any merchandise, or arising out of customer's installation or use, whether proper or impr oper, of the product, separately or in combination with other equipment, or from any other cause.

Warranty: Jameco warrants the equipment to be free from defects for a period of 90 days from dat e of purchase. If found to be defective, the products will be replaced with a new unit, not repaired. No unites will be accepted past the 90 day w arranty for repair or replacement. There is not charge fo r any replacement. Equipment or parts which have been subject to abuse, misuse, accident, alteration, negle ct, and/or unauthorized repair are not covered by the warranty. Seller shall have the right to final determination as to existence and cause of defect.

A (V-)

+

-

B (GRND)

-

+

C (V+)

DC OFFSET

R2 (100k)

R

Q (AM INPUT)

F (output)

1

4

5

2

3

6

7

NC 8

IC 1

XR2206

16

R11 (25k POT)

15

14

13

12

11

+ -

10

9 NC

C7 (10uF @ 50V)

Schematic Diagram with External Rotary

Switch (S1) for Frequency Range Selection,

SPDT switch (S2) for TRI/SINE Wave selection, and 1M ohm Potentiometer (R13) for FREQUENCY. Not Shown is 50k potentiometer (R12) for AMP ADJUST – connection of pot to PCB depends on single supply operation (see figure 3) or split supply (see figure 4)

SCHEMATIC

R10 (1k POT)

R8 (300 ohms)

S2 TRI/SINE WAVE

O

N

M SYNC OUTPUT

(FULL SWING)

1

2

D

E

F

H

(S1)

4

3

G

FREQUENCY RANGE

C3 (1uF)

C4 (0.1uF)

C5 (0.01uF)

C6 (0.001uF)

I (Sweep Input) J

R13 (1M)

FREQUENCY

R5 (5.1k)

K (V-)

L SYNC OUTPUT

(HALF-SWING)

Scanned Picture of Printed Circuit Board

Figure 1

R10 potentiometer making note of pin layout. You may have to spread pins to match hole spacing.

Take note of capacitor polarity; if aluminum electrolytic capacitor has a polarity indicator, arrow will point to which side of the capacitor is negative or positive.

Adjustment knob of R11 should be aligned to small rectangular shape.

Notes on Capacitor Polarity and IC pin identification

Figure 2

Make note of integrated circuit before soldering into board, notch on IC should be aligned to the notch indicator on the PCB board.

Take note of capacitor polarity; if aluminum electrolytic capacitor has a polarity indicator, arrow will point to which side of the capacitor is negative or positive.

R9 potentiometer making note of pin layout. You may have to spread pins to match hole spacing.

Take note of capacitor polarity; if aluminum electrolytic capacitor has a polarity indicator, arrow will point to which side of the capacitor is negative or positive.

SYNC OUTPUT

(FULL SWING)

SYNC OUTPUT (HALF

SWING)

Frequency Sweep Input

1M OHM (R13)

POTENTIOMETER FREQ

ADJUST

Connections for Single Supply Operation

Figure 3

Rotary Switch (S1) for

Frequency Range

Selection

+12V

GROUND

Solder wire across node A and node above A

S2 Switch for

TRI / SINE WAVE

Signal Output

Amplitude Modulation

Input

50k Potentiometer

(R12) AMP ADJUST

SYNC OUT (FULL

SWING)

SYNC OUT (HALF SWING)

R13 (1M ohm) POT

FREQ

Connections for Split Power Supply Operation

Figure 4

S1 (rotary switch)

Frequency Range

V+ (+6V)

V- (-6V)

S2 TRI / SINE

WAVE

OUTPUT

AM INPUT

R12 (50k ohm) Pot

AMPLITUDE