R1,R4,R6 = 10K R2 = 1M R3 = 100K R5 = 100 ohm R7 = 1K
C1,C2 = 0.1uF C3 = 0.01uF C4 = 4-40pF C5 = 4.7pF
Q1,Q2 = 2N3904
L1 = 0.1uH
L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4-inch diamter form, such as a pencil.
C4 is a small, screw-adjustable, trimmer capacitor.