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Rfl 1—Schematic of the keyer. The portion of the Circuit enciosed by the shaded linę ia optional. lf you choose not to łnclude the sidetone Circuit, be surę to ground the unused inputs of U2 (plns 8, 9. 12 and 13). C7—0.22    tantalum or ceramic.

LS1—8-0 or 100-0 speaker.

Q1. Q3—2N3904, 2N2222 or equiv.

02. Q4—2N3906, 2N2907 or equ<v R14—1-MQ potentiometer.

U1-C04070.

U2—CO4093.

U3. U4—CD4017.

Miscelianeous

2M x 3-in. perl board.

Two 14-płn IC sockets.

Iwo 16-pin IC sockets.