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
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