Code Practice Oscillator Key

code practice oscillator key




Code Practice Oscillator Key Circuit

code practice oscillator key circuit

PARTS LIST
R1 10kΩ
R2 100Ω
R3 100Ω
R4 18kΩ
R5 180kΩ
C1 0.047µF
C2 0.047µF
C3 0.0022µF
Q1 2N4871
Q2 BC109
SW1 Key Switch
LS1 4Ω-8Ω speaker

Q1, a unijunction transistor, generates a sawtooth of about 1.5kHz to 2kHz, depending on C1 and R1. Q2 acts as a speaker driver. A 9V battery is used, and the keying is done by keying the supply line.

2N4871 PN UNIJUNCTION TRANSISTOR

2N4871 PN UNIJUNCTION TRANSISTOR




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