ka-keyer
ea4eoz
A simple keyer for the high speed CW operators
Components (15)
| Reference | Value | Description |
|---|---|---|
| Q1-Q3 | DTC143E | Digital NPN Transistor, 4k7/4k7, SOT-23 |
| U1 | RP2040-Zero | |
| U2,U4 | LTV-827S | DC Optocoupler, Vce 35V, CTR 50%, SMDIP-8 |
| U3 | 24C02 | 2Kb (256x8) I2C Serial EEPROM, 1.6-5.5V, SOIC-8 |
| U6 | XC6206PxxxMR | Positive 60-250mA Low Dropout Regulator, Fixed Output, SOT-23 |
| BZ1 | Buzzer | Buzzer, polarized |
| C1-C4 | 4n7 | Unpolarized capacitor, small symbol |
| C6,C10 | 1uF | Unpolarized capacitor, small symbol |
| C7,C8 | 100nF | Unpolarized capacitor, small symbol |
| J1 | Keyer output | Audio Jack, 2 Poles (Mono / TS), Grounded Sleeve, Switched Pole (Normalling) |
| J2 | Paddles | Audio Jack, 2 Poles (Mono / TS), Grounded Sleeve, Switched Pole (Normalling) |
| R1-R4 | 430 | Resistor |
| R11-R14 | 4k7 | Resistor |
| R15,R16 | 120 | Resistor |
| SW1 | RotaryEncoder_Switch | Rotary encoder, dual channel, incremental quadrate outputs, with switch and MP Pin |