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I think at the inverter output could use a transformer. The transformer it gives an stable impedance so the filter could be re-design at that impedance for example 1ohm.
So you could do the same for the output.
Another option is to avoid the transformer with very poor performance on the filter...
When you have to signal , different frequency you could distinguish by a low pass filter.
In order to work properly you should achieve measure the input and output impedance (the max power transfer theory).
As for calculations and topologies you must use a program to do those. You could use...
This is an example of filter as the attachment title refers to. Of course and the load impedence is very different.
As for topology yes it need to be coil as first element, and for better design it needs broadband transformer in input and output if that is possible for matching purposes. The...
as a rule of thumb yes. You could check a lot frequencies and see the cut off in 4KHz what will be. The program calculate all automatically and gives you the results you need. For example in 3 order filter you may have 20db attenuation in 4KHZ but careful because it needs space. Coils are in...
Try an LC low pass filter at 300HZ cut off frequency. that will vanish the 4KHZ frequency. The filter type must be butterworth and the insertion loss at 50HZ must be less than 1 db.
if you like to make a digital filtering program you could use that little program
http://www.winfilter.20m.com/
It convert the filter equation into C code.
On that frequencies you could not made tunable filter easy. The most companies which use filter on that bands made it with cavities, or helical coils. All those filter has some tuning range but it is very small. You must consider something like a filter bank with pin diodes and change the center...
You could look here http://www.temwell.com.tw/
they manufacture bandpass filter in many frequencies and you could shift them in large areas. Send your request and may have product ready for you.
it is from seiko and it is refereed as a pulse divider module KDI or KD1
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On the same device there is another IC that i could not find. It is marked as PCF3016 or PCF30161. All other information are wiped out.
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Dear betwixt,
The transistor which...
Dear All,
Could you please help me to identify this component? It is in TO-92 case and i try to check it with the multimeter. It seems to be burned. At all contacts which measured the impedance is infinity. The mark on this component is I or L 004 and the second line has only 9J. I could not...
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