FG2206.php 8724 Bytes 24-03-2021 12:04:01
Homebrew Function Generator (with XR2206)
Yet another (nifty) Function Generator
We know, that there are a lot of designs out there, but this one offers :
Amplitude and Offset tunable for all (Sine, Triangle and Rectangle) Waveforms
Output Voltage can be as high as 70 Vpp (useful for scanning piezos)
Built-in Clipping Detection
Built-in Frequency Counter (with ATmega8)
AM Modulation Input (controls Sine and Triangle only)
FM Modulation Input (controls all Waveforms)
Sync Output (TTL)
min < 1 Hz, max > 100 kHz in 5 (widely) overlapping ranges (Standard Version)
min < 1 Hz, max > 10 kHz in 4 (widely) overlapping ranges (High Voltage Version)
The Project uses two PCBs, one for the complete Function Generater including the Frequency Counter and one for the Power Supply and
the final Output Amplifier. (AD811 and OPA452)
Displaying alphanumeric characters is limited when using seven-segment displays,
but 'Hello' in Spanish works fine ...
... and after some 'Display-Test', the Frequency is displayed ...
If you just need the standard version, ( 20Vpp, 100 kHz ) a lot of the parts on the mainboard need not to be assembled.
The Source-Code for the ATmega8 was developped with
CVAVR and the comands have been chosen not to consume too much
calculation power in order not to slow down the interrupt controlled multiplexing of the display.
The device just needs four alignements. (Symmetry, THD, Ampl. Sine, Ampl. Triangle).
The AM-Input is AC-coupled, whilst the FM-Input is DC-coupled. Useful input
voltages are in the range of 0...3 V.
FSK, ASK, AM and FM is no Problem with this nifty Function Generator :-)
✈ Share your thoughts
The webmaster does not read these comments regularely. Urgent questions should be send via email.
Ads or links to completely uncorrelated things will be removed.
Your Browser says that you allow tracking. Mayst we suggest that you check that DNT thing ?