You do not get a 10Ghz waveform from the HB100 output.
and, even if you did, I rather doubt that you'd see it on the scope ...
You didn't pay attention to the instructions for getting your pictures visible in the post - did you?
Thank you for your explanation about waveform.
i use adapter power for supply right now. how if i will try to use battery for power supply and connect ground to negative pole of battery? and i change the op-amp to LM358? is it better proposed design?
i add media before this, but my picture looked too large and rotated so i attach them
and i change the op-amp to LM358? is it better proposed design?
No, the LM358 is poor for noise AND response.
Look for Low noise FET opamps. Rail to Rail type is what I used. Cannot remember the part number as I had them in my stores.
Post a picture of your schematic of your circuit so we have an idea what you have done. I remember I had three gain stages and lastly a comparator for driving the AVR's input. This setup kept noise to a minimum and the last stage provided a lean, TTL signal to teh AVR.
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the OP has followed the application note I found.
In their schematic they also use a LM324.
I tried that circuit and the LM324 performance was not very good. I ended up spinning a three stage circuit with each stage of low gain. I wish I could remember the part numbers of the OP amps I used.
I should read my threads...I used an OP2703 in the stages, and I did note in the early posts that the performance of the LM324 was horrible.
Although that is the App Note / suggested circuit, it is a pretty weak design.
The LM324 isn't rail-to-rail.
More importantly, it isn't even close to rail-to-rail.
When run on a single supply 5 V power supply there is a rather narrow "linear range", in which the chip functions like an op-amp.
The 324 can be very useful when one is running a unipolar 12 V power supply, or even a +/- 12V power supply, as it has a very wide Vin range.
Low voltage, unipolar designs, however, just are that chip's niche.
Good thing this isn't the ER, you've left out an extremely important knot!
just are ___ that chip's niche.
David (aka frog_jr)
I had to spell niche 3 times to get it right...
I think I may have lost a not or two during the multiple editing episodes.
Of course it might well have just been omitted from the get go!
oh.. yes, i saw your type of op-amp in early post, forgive me if i didn't read that carefully Jim
unfortunately in my country op2703 pretty hard to find and i try to use tl071, and still on progress to get waveform result. i hope the result waveform can be read by microcontroller digital input 3.3 v
and i want to ask, Can we add circuit using HB100 to detect object moving toward or away?
I am not 100% sure, but I think the sensor signal (after the demodulation transistor) is very much alike to the signal out of a PIR motion sensor.
I've looked at a few PIR motion sensor IC's and they are mostly a few opamps, used as a very high gain low frequency amplification (Filtered at 10Hz or less) , followed by a flipflop and a timer circuit. These PIR sensors are very common and are often still built with Through hole technology. Easy to hack into. It might be an good idea to re-use the PCB of a PIR sensor for this (And then just ignore the flipflop & timer part).
About the frequency range:
These sensors work with doppler. The 10GHZ output signal is mixed with the reflected signal. For slow moving signals (such as walking in front of the sensor) you will get signals around the 1Hz range. If you glue a piece of aluminimum foil onto a small loudspeaker, you might be able to pick up the audio from the loudspeaker with the HB100, but I haven't tried that.
Doing magic with a USD 7 Logic Analyser: https://www.avrfreaks.net/comment/2421756#comment-2421756
Bunch of old projects with AVR's: http://www.hoevendesign.com
If you Google the HB100 there are down very good YouTube videos on the device.
You do not need to use the ones I used...you just need a well thought out circuit.
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