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K1EL CPO Assembly & User'S Manual Download Page 13

 K1EL                                

Morse Code Practice Oscillator

 CPO

 

CPO Datasheet – A.3 

4/10/2020

 Page 

13

 

 

 

Figure 14 – How to attach top cover 

 

 
Control Knob Positioning 

 
You may find the control knob positioning unfamiliar. The following drawing illustrates 
how they work. In this example, the volume control is set to minimum while the pitch 
control is set to midrange. 

 

Figure 15 – Volume and Pitch Settings 

 

Using the CPO Kit 

 
The CPO is strictly a tone generator, it does not have an internal keyer that automatically 
generates dits and dahs. Instead it will generate a tone for as long as the key input or 
red pushbutton is held on (low). The CPO has built in pull ups on both the key and FSK 
inputs so you can connect the CPO directly to the output of an open collector keyer 
(WKUSB, K44, K16 or similar) and it will work fine. It also works well with a straight key.  
 

GND

FSK

KEY

 

Figure 16 – CPO Key/FSK Input Connections 

 

Summary of Contents for CPO

Page 1: ...K1EL CPO Code Practice Oscillator Kit Assembly User Guide Revision A 3 April 9 2020 www k1el com ...

Page 2: ...ation It is implemented in a Microchip PIC12F1501 single chip microcontroller An LM386 provides a higher drive level for an internal speaker external speaker or headphones A red keying pushbutton is provided to manually key the oscillator for testing purposes When the frequency pitch control is set fully clockwise RTTY test tone mode is enabled When RTTY mode is active the tone frequency is fixed ...

Page 3: ...er PIC Low Pass Filter Pushbuttons Internal Speaker Speaker Output Jack 3 5mm 1 8 Audio Line Out Jack 5 volts 3 5mm 1 8 CPO Block Diagram K1EL Rev C 2 6 20 FSK Key Pitch Volume miniUSB Power Connector Keying FSK Input 3 5mm 1 8 LM386 AF AMP Figure 1 CPO Block Diagram CPO KIT Construction The MTB keyer kit consists of a single board with all through hole components for easy assembly It s a good ide...

Page 4: ...ange ___ R9 1 12 ohms 1 8W Brown Red Black ___ RX2 1 5K Variable Trimmer Resistor white ___ D1 1 Red LED ___ S1 1 Black Push Button ___ S2 1 Red Push Button ___ U1 1 CPO PIC PIC12F1501 8 pin DIP ___ U2 1 LM386 8 pin DIP ___ SK1 SK2 2 8 pin DIP socket for U1 and U2 ___ RX1 RX3 2 20K Potentiometer right angle ___ J1 J4 2 1 8 SMT Jack ___ J2 1 1 8 SMT Jack w switch ___ J3 1 Mini USB Jack pre soldered...

Page 5: ...s are presented in the parts list but feel free to verify them with an ohmmeter the color bands on 1 8 watt resistors can be difficult to read Use Figure 4 on page 6 as a guide As with all components to follow insert the component leads into the board and make sure the part is fully flush with the board Then bend the leads to hold the part in place before soldering Neatly trim the leads Using a re...

Page 6: ...actice Oscillator CPO CPO Datasheet A 3 4 10 2020 Page 6 For a better fit straighten out the 0047 uF capacitor leads as shown in figure 3 below Figure 3 C5 C8 C15 lead straightening Figure 4 First stage assembly complete ...

Page 7: ...oard before soldering If you don t do this right the board won t fit the enclosure Also make sure that all three signal leads go into their correct holes If you push the pot firmly in place it will stay there while you solder Figure 5 Second stage assembly complete Now install three surface mount 1 8 jacks Don t let the term surface mount scare you these are very easy to install The light colored ...

Page 8: ...w the connection and nudge it in place After soldering RX2 in place set the trimmer control knob to the halfway point it s easiest to use a small screwdriver and turn the knob until the flat side is at the top most position Install speaker SP1 There is a silver dot on the side of the speaker orient this so that it faces C12 this is not essential so don t worry if you put it in backwards Install th...

Page 9: ... so that the longer lead goes into the hole closest to S2 Do not solder yet Figure 8 LED Lead Preparation Our goal is to install the LED in such a way that it will just poke out of the enclosure front panel hole It can t sit too high too far front or too far back The following two pictures on page 10 illustrate the optimal LED placement Figure 9 The LED lines up vertically with the pushbuttons Fig...

Page 10: ...closure to add a power switch Figure 11 DON T FORGET TO JUMPER S1 to S2 Install the two 8 pin DIP ICs The PIC12F1501 goes into position U1 and the LM386 goes into position U2 Please check to be sure you have pin 1 of the ICs in so that they are next to the number 1 on the silkscreen Pin one is indicated by a small round dimple on the IC The red arrows below point to pin 1 on each IC Figure 12 U1 a...

Page 11: ... as shown below Figure 12 Carefully align and attach top sticker Attach the front and then remove the remainder of the backing Press the rest of the label in place Avoid air bubbles by moving slowly and smoothing the label as you go Install the four press in rubber feet in the enclosure base Then place the PCB into the enclosure base pot shafts first The PCB is held in place by five silver 4 40 sc...

Page 12: ...speaker connected between tip and ring The audio line output can be fed into an amplifier to generate even more volume The CPO s internal trimmer can be adjusted to provide a convenient level Troubleshooting The CPO is a fairly simple kit and if you take your time it should work the first time it s powered up Here are a few areas to check out if you are having trouble If you don t see 5V make sure...

Page 13: ...gure 15 Volume and Pitch Settings Using the CPO Kit The CPO is strictly a tone generator it does not have an internal keyer that automatically generates dits and dahs Instead it will generate a tone for as long as the key input or red pushbutton is held on low The CPO has built in pull ups on both the key and FSK inputs so you can connect the CPO directly to the output of an open collector keyer W...

Page 14: ...me level so as not to disturb others The speaker s output varies with frequency so you will find some frequencies are much louder than others The volume control will affect the internal speaker volume External Speaker Headphones A more flexible option is to use the external speaker connector This can drive a set of stereo headphones or an external 4 16 ohm speaker Note that the external speaker mu...

Page 15: ...K1EL Morse Code Practice Oscillator CPO CPO Datasheet A 3 4 10 2020 Page 15 CPO Schematics ...

Page 16: ...ials and workmanship for one year after purchase This warranty does not cover damage caused by accident improper assembly or lightning damage Please contact us before returning your CPO for repair and we will issue an RMA Please submit questions by e mail to k1el kitsinfo gmail com Watch our website for latest updates and new products http www k1el com While every effort has been made to insure th...

Page 17: ...he pushbuttons 9 Figure 10 The LED should extend from the PCB as shown 9 Figure 11 DON T FORGET TO JUMPER S1 to S2 10 Figure 12 U1 and U2 Pin 1 orientation 10 Final Assembly 11 Figure 12 Carefully align and attach top sticker 11 Figure 13 Attach PCB to enclosure base with five screws 11 CPO Kit Checkout 12 Troubleshooting 12 Finishing Touches 12 Figure 14 How to attach top cover 13 Control Knob Po...

Page 18: ...pletely and have everything on hand before you start Inventory the kit parts make sure you have ALL of them 4 Follow the assembly instructions in order Although not always obvious the order in which parts are added to a board is important and should be followed Sometimes sections are installed and tested in order or there could be a mechanical clearance consideration 5 Keep your Workplace Clean an...

Page 19: ...p to a wet pad to test for temperature Wear safety glasses to protect your eyes from flying objects Appendix C Soldering Basics 1 Insert component leads into PCB holes and bend them back slightly to hold the part in place You can either trim the lead now or wait till after the joint is soldered I usually install several parts at one time and then solder and trim multiple leads 2 Place a hot and cl...

Page 20: ...he work 5 Remove the solder and then remove the iron Figure C3 Remove the solder 6 Allow the joint to cool and visually inspect for defects or other problems You should have a solder joint with a bright shiny finish and a profile like that shown in the middle picture below Figure C4 Solder quantity comparison ...

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