Difference between revisions of "VFO-005"
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Revision as of 13:18, 14 November 2020
Contents
Variable Frequency Oscillator (VFO)
AD9833 based design.
- Arduino Pro Mini
- 3.3V/8MHz
- AD9833 Function Generator
- DC to 12.5 MHz
- Rotary Encoder/Breakout Board
- 128x32 OLED
- Breadboard Power Supply
- 3.3V operation
- Mini-360 Voltage regulator (in case)
- 5-24 VDC input
AD9833 Function Generator
- Digitally programmable frequency and phase
- 12.65 mW power consumption at 3 V
- 0 MHz to 12.5 MHz output frequency range
- 28-bit resolution: 0.1 Hz at 25 MHz reference clock
- Sinusoidal, triangular, and square wave outputs
- 2.3 V to 5.5 V power supply
- No external components required
- 3-wire SPI interface
- Extended temperature range: −40°C to +105°C
- Power-down option
- Update Rate: 25(max)
- VOUT Maximum: 0.65V
- VOUT Minimum: 38mV
- VOUT Temperature Coefficient: 200°
- Input High Voltage: 1.7-2.8V
- Input Low Voltage: 0.5-0.7V
- Input Current: 10µA
- Input Capacitance: 3pF
- Operating temperature range is −40°C to +105°C; typical specifications are at 25°C
Arduino Pro Mini
- 3.3V
- 8 MHz
File:ArduinoProMini-SDASCL 720px.jpg
Rotary Encoder/Breakout Board
- Includes pushbutton Switch
- Includes Pull-Up resistors
- Needs R/C filter on output for debounce
- Reading Rotary Encoders - Arduino reference
- Simple Rotary Encoder Arduino library
- Library for the Arduino environment for using a rotary encoder as an input
128x32 OLED
- Ebay
- 5V/3.3V operation
Breadboard Power Supply
- On breadboard build
Power Distribution Board - Revision X1
- Two headers with 6x2 pins each
- Six pins bussed together
- Ground connection header
- Rounded Corners
- 4 mounting holes for 4-40 screws
Breadboard
Schematic
Build
- DC jack, power distribution card and Mini-360 voltage regulator
- All of the parts get jammed into the box
- Some are hot glued
- Cutout for OLED
- Running with frequency counter
- Display looks great in person not as good on picture