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I've had (for a very good price) an oscillator CJMCU-9833 based on AD9833.
All the sellers on the I-net provide the same Baidu link, as the address of the manual.
Needless to say: I cannot download this manual.
My question is: could someone, please, send me the manual for this module...
As far as I see on your breadboard, the emitter and collector are not wired correctly (inversion).
Maybe I am wrong, but I think you should check with the data-sheet:
If you allow me a suggestion, I think you may obtain a better result with an opto(de)cupler MOC3021, followed by a triac BTA20 600B (if the opto(de)cupler current does not suffice).
You can buy those on E-bay or Aliexpress for less than $5.
Here you have the links for the data-sheets...
I have a very stupid question, the kind only a beginner could ask (sorry for wasting your time).
Believe you me, if I had found this kind of information on Google, I wouldn't bother you.
I want to learn how to calculate an amplifier form a data-sheet.
Could someone point me to some...
Sounds to me like a "classical" connectivity problem.
Question : can you "ping" the machine running your server (in your mock IPv4 address : 22.214.171.124), form another 3G connected device (i.e. your phone)?
If so, I have no answer.
Else, I think you should expose your server's machine to...
Thank you so much Klaus.
I think this is the solution !!!
I found an integrated circuit that looks very promising : ALD2701.
As soon as I built the device, I will provide feedback and mark it "solved" (it may take some time).
I try to build an ultrasonic generator, with (no harmful) high frequencies.
Those frequencies are supposed to be unpleasant for animals.
The device I bought is a "Horn tweeter", thus a resonance frequency do not apply.
I will use it to protect my car against animals.
I live near a...
Personally, I would consider to use an Arduino Nano (it cost $1.45 on some well known commercial sites).
If you look for "New Pro Mini atmega328 Board 5V 16M Arduino Compatible Nano NEW M43" you might find what you need.
Partially solved : how to build an ultrasonic generator
I found (on some well known commercial websites) the following circuit:
NE555 Pulse Frequency Duty Cycle Adjustable Square Wave Signal Generator HC
I suppose the schematics is, more or less, like in the img2.png...
I bought an ultrasonic transmitter, with no model number.
The only reference I have is : ultrasonic speaker 38mm horn.
In the specifications, I found that it works for frequencies between 9 khz and 46 khz (yes, I'm as astonished as you are).
My problem is that I do not know how to...