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DIY Hobby projects, diagram, schematic

Electronic Circuits

DIY Hobby projects, diagram, schematic

Code Practice Oscillator Key

electronicecircuits, March 21, 2010August 17, 2023
code practice oscillator key

Code Practice Oscillator Key Circuit

Morse Code is a two sound for representing letters of the alphabet, numerals, and punctuation marks by an arrangement of dots, dashes, and spaces. Morse code transmits electrical pulses of varying lengths or mechanical or visual signals, like flashing lights. You can practice morse code using below circuit.

code practice oscillator key circuit


PARTS LIST
R110kΩ
R2100Ω
R3100Ω
R418kΩ
R5180kΩ
C10.047µF
C20.047µF
C30.0022µF
Q12N4871
Q2BC109
SW1Key Switch
LS14Ω-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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  1. samshadc says:
    April 18, 2012 at 4:05 am

    hi

    Reply

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