Everything Else Electronic

[Shy Wolf]

Into computers no, not really.

I am a damn good Communications Systems Technician. I work on everything from wired communications systems to commercial satellite. All forms of radio and wireless phones (yes, cell phone too) and devices. Microwave communications systems, HF, VHF, UHF as well as AM and FM broadcast.

So, if you have a question, let it rip and I'll see if I can help you out or satisfy your curiosity.

[Mosin Nagant]

I need to design a 2 stage bandpass filter as simply as possible for a final project. Any suggestions/ schematics?

[Pilou]

Please ecplain what you call a 2 stage filter ?

What are the characteristics of your bandpass filter ?

What components do you have access to ?

Is it an active of passive filter ?

[Mosin Nagant]

Please ecplain what you call a 2 stage filter ?

What are the characteristics of your bandpass filter ?

What components do you have access to ?

Is it an active of passive filter ?
It just has to be on paper (even though the electronics lab has anything I need to make it). I'm thinking of using a quad op amp to accomplish a 100-10kHz bandpass filter. I found a few schematics online that will do good.

[Shy Wolf]

Ok gang. First of all I would need to know what kind of two stage filter do you need. If it is simply a band pass filter, we would then need to know the frequency range to be passed and the "Q" you expect out of the filter.

Remember, the higher the "Q" generally the lower the bandwidth.

Let me know the particulars of the filter you need to design and I can run it through my reference books and software.

Most of the bandpass filters I use are in the radio frequency (RF) range. Also, most include band pass and band reject for better selectivity.

[Rrruff]

Shy Wolf is so smart... 8)

[Mosin Nagant]

Ok gang. First of all I would need to know what kind of two stage filter do you need. If it is simply a band pass filter, we would then need to know the frequency range to be passed and the "Q" you expect out of the filter.

Remember, the higher the "Q" generally the lower the bandwidth.

Let me know the particulars of the filter you need to design and I can run it through my reference books and software.

Most of the bandpass filters I use are in the radio frequency (RF) range. Also, most include band pass and band reject for better selectivity.

Lol my teacher assigned me a Q point of 10 and a multiple feedback bandpass single op amp filter with a gain of 2. It changes my plans a little, but I think I can make due.

[Shy Wolf]

Well done. I rarely get to use or make bandpass filters in the low audio ranges. Most of my work is in the RF range using passive filters. More like plumbing, once you work out all the factors to build the filter. The last low band filter I made was a SCAF. Switch Capacitance Audio Filter. Used to narrow down an incoming audio signal and limiting it to 1000, 500, 100 or 50 Hz. The biggest problem was to keep the filter from ringing at the narrower band widths. Feedback, you gotta hate it.

Good luck with your project.