Favorite Keyer Projects

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Code Boy Pup My first modern electronic keyer built from a kit. I reviewed it in the ARCI QRP Quarterly a few years ago. Code Boy Pup
Front controls above right and inside wiring. Code Boy Inside The Code Boy Pup is a non-memory keyer built in a Hammond cast aluminum enclosure. This is a basic keyer and does a good job if having memories is not a consideration. See the Code Boy Pup website for more details.

PK-3 Keyer My second modern keyer built from a kit. This one is a memory keyer with several nice menu options including beacon mode and does a great job with basic keying functions. The PK-3 does not have non-volatile memory as does the newer PK-4 from Jackson Harbor. PK-3
The PK-3 is shown with the Vibroplex Code Warrior Junior. The Code Warrior was originally a paddle kit from NorCal. PK-3 and Paddle A PK-3 from Jackson Harbor is my second keyer built in a 2x2x1-1/4 Hammond enclosure. This was done just to see how compact it could be done. Speed control and paddle jack are on the front. Power, command button, and the RCA jack connection to the rig are on the back. The piezo speaker is mounted under the hole in the top. Beacon control is the primary use of the PK-3 these days.

K1EL K10 Keyer My first K1EL keyer was the K-10. Similar command set to the newer K-12. I built this one in a smaller Eagle enclosure and only used 3 of the 5 available K-10 memories. The K-10 kit is no longer available being replaced with the K-12. The optional speaker driver parts were added and a 2 in. speaker was used for the sidetone. More volume than needed but great for code practice. K10 Front
K10 Back

K10 Inside

The K-10 PCB is mounted on the box bottom panel along with the sidetone speaker. Back panel includes power, paddle and rig connectors. The K-10 chip was replaced with the newer K-12 which has non-volatile memory. The upgrade required the addition of a pullup resistor on the K-10 PCB.

Super K12 Keyer K-12 is a revision and upgrade of the K-10 with a revised and extended command menu.

My version of the K-12 is built in a roomy Eagle cast aluminum enclosure.

The PCB is mounted without drilling holes in the enclosure. Scroll down to see the drawing.
K12 Front
Views are: Top rignt - front panel, Lower left - back panel, Lower right - inside view. K12 Back

K12 Inside

All the operating controls are on the front including buttons for command, speed set and 6 memories along with the speed control. The white button is dedicated to a beacon message. The back panel includes a power jack, paddle jacks switchable for two paddles, the tune/spot button and the RCA output jack to the rigs paddle jack. The tune/spot button is connected across the RCA jack. See the K1EL site for more details.

NorCal Keyer This is the NorCal keyer kit built in an Eagle cast aluminum box. Iíve recently changed the NorCal keyer chip to the latest PK-4 keyer chip from Jackson Harbor. The PK-4 provides many more features and functions along with non-volatile memory.

BTW, the finish on Eagle cast aluminum boxes is nicer than Hammond boxes. Eagle cleans up the sprues and gates.
NorCal Front
The little paddle on top is one of Dennisí Te-Ne-Keys that I won at ArkieCon a couple of years ago. NorCal Inside Lots of room inside. The internal battery can be connected for portable use by plugging it in in place of the regulator.

I replaced the supplied 3-terminal regulator with a Seiko low current (ĶA) version. The keyer will run for a year or more on an external 9V battery.


Schematic of the NorCal Keyer as-built
with peripheral parts shown in the pictures above.

NC Keyer Schematic

No Holes Mounting Scheme Used with the K1EL K-12 Kit Mounting

No Holes Mounting