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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 9:44 am 
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uptownmaker wrote:
Remember, all electrons want to travel a circular path-

...unless it's a $20 plasma disc, apparently.

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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 5:28 pm 
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noise wrote:
Each is powered by a 9V battery, so how would I connect the grounds, bridge the negative posts of the batteries?


That would work. How are you connecting the output of one to the input of the other? If your connector has two or more contacts, you can use one of them.

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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 5:49 pm 
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uptownmaker wrote:
noise wrote:
Each is powered by a 9V battery, so how would I connect the grounds, bridge the negative posts of the batteries?


That would work. How are you connecting the output of one to the input of the other? If your connector has two or more contacts, you can use one of them.


I don't have a jack soldered into my APC yet (still working on the enclosure), so I just stuck the output wire directly into the breadboard for the Amp.

I guess it makes more sense if I think of it in that context though.

Will grounding it correctly improve the RF situation? Although I think I was having that even without the APC connected.

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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 5:55 pm 
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Most likely- were you actually receiving a radio station?

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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 7:26 pm 
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uptownmaker wrote:
Most likely- were you actually receiving a radio station?


Yes.

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 Post subject: Re: Amp Circuits
PostPosted: Fri Mar 13, 2009 10:58 pm 
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noise wrote:
uptownmaker wrote:
Most likely- were you actually receiving a radio station?


Yes.


That's pretty awesome, I'd say leave that one broken and start over and make a non-radio, or an amplifier to amplify your radio.

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 Post subject: Re: Amp Circuits
PostPosted: Sat Mar 14, 2009 5:20 am 
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I finally got around to trying it this morning, bridging the grounds fixed it, it works great and the RF went a way.

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 Post subject: Re: Amp Circuits
PostPosted: Sat Mar 14, 2009 5:22 am 
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jtbarclay wrote:
noise wrote:
uptownmaker wrote:
Most likely- were you actually receiving a radio station?


Yes.


That's pretty awesome, I'd say leave that one broken and start over and make a non-radio, or an amplifier to amplify your radio.


Yeah it's pretty cool (for a noise inclined guy like me anyway), I was just listening to it again, it actually sounds like a couple of stations overlapping, AM band I suppose.

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 Post subject: Re: Amp Circuits
PostPosted: Sun Mar 15, 2009 10:34 am 
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noise wrote:
Pretty cool (for a noise inclined guy like me anyway), I was just listening to it again, it actually sounds like a couple of stations overlapping, AM band I suppose.


VERY cool. It was almost certainly AM- AM radio is quite easy to pick up and decode, both because of the very low frequencies involved (it tops out well below 2MHz, which is practically DC as far as weird high-frequency behavior is concerned) and because it's such a simple modulation scheme.

In fact, if I stretch my memory back to my communications class, the simplest AM receiver is basically an antenna with an amplifier feeding a diode with a low-pass filter attached. REALLY easy to make, and in fact, almost exactly what you have there.

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