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Original DDS Version 2.0
Frequency range: 0 - 65534Hz
Waveforms: sine, square, saw, rev saw, triangle, ECG and noise
Digital output(square): 1, 2, 4, 8 Mhz
Frequency adjusting steps: 1, 10, 100, 1000, 10000Hz
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Improved DDS Version - Anatoli Klassen

• Synchronization pulse of HS-output on start of sequence or for each period
• Sweep. Start, stop frequency and step are configurable.
• Additional 'options' menu
• Off-state is configurable
• PWM with configurable duty on the HS and analog outputs
• Modify frequency on-the-fly
• Persist all settings
• Maximal frequency increased to 250 kHz
• Frequency resolution is 0.001 Hz
• Speed-up the noise (~x50)
• Calibration of frequency
• One-pulse mode with configurable length on the HS and analog outputs
• Start trigger with configurable delay
• Exact-frequency and minimal-jitter modes
  

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My dds: 65KHz/sine

1. Original Atmega16 DDS vers. 2.0 - http://www.scienceprog.com/avr-dds-signal-generator-v20/
Original Schematic (slightly modified)
Firmware Atmega16 - 2008

2. Improved Atmega16 DDS - https://github.com/dev26th/avr_dds_20
New Schematic - Reset button is used for STEP adjustment
New Firmware Atmega16 - Erase the uC before firmware upgrade!

3.Fuse Bits Configuration:
Pony Prog - select  OCDEN , BOOTSZ1 and  BOOTSZ0
Simple programming interface for Pony Prog
AVR eXtreme Burner Configuration

yo4hfu@2010-2021