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Thanks all for the help.
WimRFP, could you please provide more details (or circuits) for the design of two transistor differential mixer? I have only examples for 3 transistor diffrentail mixer in some of my text books.
Hello All,
Could any body please advise a good simulation software for designing circuits up to 150Mhz? I use Multisim 10 from national instruments but I think it is not very helpfull at these frequencies. I have also downloaded Agilent ADS 2009?
any advise is very appreciated.
Hi all,
I trying to design a simple BJT mixer AM receiver. I tried many circuits found on the internet but I want to design my own circuit with the LO injected through the emitter and the IF out through tuned circuit on the collector, but I have quision:
What is the non-linearity that should...
hi all,
When swithcing ON a commercial FM receiver, we hear that clear noisy sound from the receiver speaker, but when changing to AM receiving, that noisy sound is not heared.
my quesions are:
1)Where is that noisy sound comming from? Is it internally generated in the receiver, or...
Hello all,
Could any body please recommend me an RF simulation software. The upper limit of simulated frequency is 150Mhz, I'm not looking for microwave simulators which I can not understand or use.
I intend to simulate AM, SW and FM transmiters and receivers.
any help is appreciated.
Hello all,
I have been looking for SW receiver circuits or projects since a time but I can not find. Only some circuits of regenerative recivers which I don't need. I will appreciate if any body could recommens where to find superhetrpdyne SW receiver circuits to build.
thanks in advance for...
A good news.
By connecting the cold end of C13, C14 & C19 directly to C4, there was big improvement in the stability. The oscillation is stopped although the circuit still has tendency to oscillate, I think there still some form of feedback caused by the layout of components. Even...
I'm working on the new PCB, because of the limited time I hope this will not take long time.
For the time being, I would like to get more advises about the parts of the circuit such the transformers and gain, number of stages...etc.
any comments about the IF transformers? The coils were rewond on toko coils I had since long time without any datasheet. The contruction was based on the information provided on this web page:
if amplifier transformers
The following link was my start point in my receiver project:
am radio...
This receiver utilizes tuned amplifiers which is a basic building block, therefore I must get used to it, including stabilization and performance evaluation. Tuned amplifiers are used everywhere, so I really need to understand how to use it and stabilize it. All techniques I read on tuned amp...
The reason I'm dealing with AGC is that because I need to ensure stability at the highest gain, then when the circuit is stable, I'll add the AGC circuit, that is why the PCB contained the AGC parts places byt not connected.
Again, as a simple rule, what is the usual gain of each stage that I...
Thanks vfone for your help. I 'll try out this circuit if I couldn't get mine to work.
In general, and as a rule of thump, how much gain should I get from each stage in the IF amp. I have seen some articles where some pepole limit the gain to 15db to 25db, is this applicable here? in this case...
G0HZU, can you please suggest any sites, links or books.
I'm trying to receive AM signals, and doing this project to get some expirince on RF design and construction.
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