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KD1JV SKC Keyer Kit Assembly
First, familiarize yourself with the parts and check for all the components. If a part is missing, please
contact us and we will send one. To request a part, please use qrpguys.parts@gmail.com.
Please read all the instructions carefully before starting.
Parts List
1 – KD1JV SKC Keyer pcb
1 – U1, ATtiny45 microcontroller, 8pin DIP
1 – U2, 78L05, TO-92 case
1 – Q1, 2N7000 mosfet
1 – D1, 1N4148 diode, small glass, w/black band on one end
1 – R1, 100 ohm resistor, (brown-black-brown-gold)
4 – C1,2,3,4, 100nF (.1uF) capacitor, marked 104
1 – C5, 10uF electrolytic capacitor
1 - S1, 90º tactile pcb switch
1 – J1, 3.5mm stereo jack
1 – 8 pin dip socket
Page 1 of 9
skc_assy_041722.pdf
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Summary of Contents for QRPGuys KD1JV SKC Keyer
- Page 1 First, familiarize yourself with the parts and check for all the components. If a part is missing, please contact us and we will send one. To request a part, please use qrpguys.parts@gmail.com. Please read all the instructions carefully before starting.
- Page 2 Two options for the finished envelope Before starting, think about how much room you have to install the keyer in your chassis and where you want to place it. There are two flexible options for building the keyer, from more room available, to least room available in your chassis.
- Page 3 Option 1 Install the smallest components first. All the components mount on the front of the board. Use the placement guide below. Parts placement figure Install D1, the small glass 1N4148 diode, Match the black end with the silkscreen outline. Install R1, 100 ohm resistor, (brown-black-brown-gold).
- Page 4 Option 2 Option 2 mainly involves splitting the pcb into two pieces, and interconnecting them with 4 jumpers. This option allows the most flexibility for difficult tight quarters. The main board can be virtually anywhere inside the chassis, as you can attach it using a small piece of double side foam tape. The connector board is attached to the chassis wall after drilling two holes, and securing with the 3.5mm threaded ring.
- Page 5 Install C1,2,3,4, 100nF (.1uF) capacitor, marked 104 Install 8 pin dip socket Install C5, 10uF electrolytic capacitor. Observe polarity marked on the board. Long lead is “+”. Install U2, 78L05, observe the outline shown on the board. Mount U2 very close to the board, so that the top is no more than .25”...
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Page 6: Mounting Options
Mounting options In both mounting options the one piece keyer board or separate connector board are designed to mount to the 1/16” thick wall of your chassis, and is held in place by the threaded ring supplied with the 3.5mm jack. All that is needed is to drill two holes, as described below and mount the keyer board or connector board directly with the 3.5mm jack that is soldered to the pcb. -
Page 7: Function Switch
Basic Keyer Operation: Iambic “B” mode Jack wiring: DOT = Tip, DASH = Ring Function switch: This is a timed switch. Which function is enabled depends on how long the switch is held closed. Functions are selected in the following order: 1 - Send message 2 - Change code speed 3 - Enter/store message... - Page 8 2. Key in your message via the paddle. Ideal space timing is used to automatically detect the end of a letter group and insert word spaces. A letter group is formed after a 3 dot length pause. A word space is inserted after a 7 dot length pause.
- Page 9 Schematic General design notes: Tx keying output from chip is active high. The 2N7000 mosfet is supplied to invert the signal as most rigs key and mute with active low signal. It also allows for switching voltages greater than the 5 volts the SKC operates at.