Quartz crystal oscillator
A very simple crystal quartz oscillator circuit schematic which use a quartz for frequency stability and a good rf tranzistor. Use a 2-nd or 3-rd harmonic crystal , for example if you want 100MHz use a 50MHz or 33.3MHz quartz or if you want use a 4-th harmonic crystal but the output rf voltage will be lower. The L coil has 5 turns 0.8mm Ø , 6mm Ø , 1 mm step, output at first turn from + . Use C4 for fine frequency adjustments. For a great frequency stability, this quartz oscillator circuit must use a good varicape diode ( you can use bb139 ) .
Quartz oscillator circuit components:
R1 = 5.6K
R2 = 3.3K
R3 = 560
R4 = 33
R5 = 10K
R6 = 100K
C1 = C2 = 1nF
C3 = 10 … 33pF
C4 = 10 - 60pF trimmer
C5 = 22pF
C6 = 120pF
C7 = 100nF
D = BB139
T = BF199
Q = QUARTZ CRYSTAL 2-nd, 3-rd or 4-th harmonic
Related Schematics
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