Related Manuals for K1EL CPO
Summary of Contents for K1EL CPO
- Page 1 K1EL – CPO Code Practice Oscillator Kit Assembly & User Guide Revision A.3 April 9, 2020 www.k1el.com...
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Page 2: Features
A 1/8” input jack is provided to key the oscillator from practically any keyer or straight key. Note that the CPO does not have a built in keyer, it is only a tone oscillator. A single chip microcontroller provides all of the functionality of the CPO including sine wave generation. -
Page 3: Cpo Functional Block Diagram
K1EL CPO Functional Block Diagram Figure 1 is a block diagram of the CPO. The CPO PIC accepts input from the pushbuttons and keying input jack. When keyed, the CPO generates a PWM encoded sine output that passes through a low pass filter and to both an audio line output connector and the input of the LM368 audio amplifier. -
Page 4: Cpo Parts List
12 ohms 1/8W Brown Red Black 5K Variable Trimmer Resistor (white) Red LED Black Push Button Red Push Button CPO PIC, PIC12F1501, 8 pin DIP LM386 8 pin DIP SK1,SK2 8 pin DIP socket (for U1 and U2) ___ RX1,RX3... -
Page 5: Cpo Assembly Instructions
K1EL CPO Assembly Instructions Figure 2 shows the CPO board as shipped, note that the Mini USB connector is pre- attached. The board is ready to build, please don’t clean it with solvent or an abrasive pad. Be sure to use a good rosin core solder, avoid solder with acid or organic core. - Page 6 K1EL 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 CPO Datasheet – A.3 Page 6 4/10/2020...
- Page 7 Use Figure 6 as a guide. Keep in mind that these are plastic connectors and can be damaged if you use too much heat or touch them with your iron. CPO Datasheet – A.3 Page 7...
- Page 8 C12, this is not essential so don’t worry if you put it in backwards. nstall the tall electrolytic capacitor C10 the same way you installed C6, C9, and C11. Figure 7 – Third stage assembly complete CPO Datasheet – A.3 Page 8 4/10/2020...
- Page 9 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 Figure 10 – The LED should extend from the PCB as shown CPO Datasheet – A.3 Page 9 4/10/2020...
- Page 10 Morse Code Practice Oscillator K1EL The CPO design has a provision for an on/off switch. It would be wired between PCB pads S1 and S2. Since the kit does not include a switch, S1 and S2 must be connected together with a resistor lead scrap as shown in figure 11 below.
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Page 11: Final Assembly
The PCB is held in place by five silver 4-40 screws (HW1). Figure 13 – Attach PCB to enclosure base with five screws We will attach the enclosure top after completing the following CPO tests. CPO Datasheet – A.3 Page 11... -
Page 12: Cpo Kit Checkout
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. -
Page 13: Control Knob Positioning
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. - Page 14 Morse Code Practice Oscillator K1EL Note that the FSK input is only used when the CPO is in RTTY test tone mode which happens when the pitch control is adjusted fully clockwise. That is the only time the CPO will look at the FSK input. So in normal operating mode you can use a mono plug for the key input and it will key the CPO just fine.
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Page 15: Cpo Schematics
Morse Code Practice Oscillator K1EL CPO Schematics CPO Datasheet – A.3 Page 15 4/10/2020... -
Page 16: A Word Or Two Regarding Usb Phone Charging Batteries
CPO idle current. What usually happens is the charger will run the CPO for about 5 minutes and then shut down. We have found some charging batteries that will provide power indefinitely but the majority won’t. To get around this, a... -
Page 17: Table Of Contents
CPO Assembly Instructions ..........................5 CPO Assembly Instructions ..........................5 Figure 2 – Board as shipped from K1EL ....................5 Figure 3 – C5, C8, C15 lead straightening ....................6 Figure 4 – First stage assembly complete ....................6 Figure 5 –... -
Page 18: Appendix A - Kit Construction Hints
There is no need to rush, enjoy the process and the end result will be much better. Moving too quickly or working when you are tired often leads to big mistakes which could be difficult if not impossible to fix. CPO Datasheet – A.3 Page 18 4/10/2020... -
Page 19: Appendix B - A Note About Safety
4. Apply solder around the outside edge of the pad as in Fig. A2. If the pad and lead are at the correct temperature, the solder will flow around the connection. CPO Datasheet – A.3 Page 19 4/10/2020... - Page 20 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 CPO Datasheet – A.3 Page 20 4/10/2020...
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