Press any key to stop the modulation.
Module Filter remove In order to use an alternative output filter for the AD9850 you have to remove the original filter, see the picture on the right.
The frequency response is: The -3dB cut off is expedia vegas promo code 2015 at 73 MHz and the stop frequency 104 MHz with 75 dB attenuation.
It looks like, that the filter was designed for an AD9851, and the output impedance is 200 Ohm.
I see people have done this differently using a log detector and an ADC to capture the sample points.The bulk of hardware consists of Atmega328 that controls 16-key keypad, DDS module, and LCD display.Filter from AD9850 module This filter comes from the AD9850 module from China.Please see the pictures on the right.
For this simple sweep generator, this limitation shouldnt matter much.
It is also very inexpensive and easy to use.
Once the pin is disconnected, its just a simple matter of soldering a wire from.9k resistor R6 to the freed up data pin.
The sweep frequency adjustment is achieved via the potentiometer on analog pin 5 (chip pin 28).MAX889 inverting charge pump.First is to bring the rset pin (12) out to connector.Linear Sweep Output Here is a picture of everything put together inside a project box.It is way better than nothing, though, and plenty good for adjusting the dial and working on old-school analog receivers.Step 1, modification of HC-SR08 module.