[Lowfer] 1 watt in class " AB " into 32 Ohm load, BW - 600 KHz, and it's an audio amp

[John Andrews]

In the case of IC's, those data sheets have graphs that show things that 
vary with frequency, like power output, voltage swing, distortion and so 
forth. When you are trying to use a part in something for which it 
wasn't designed, those graphs will give you some important clues.

John, W1TAG

On 11/24/2010 5:47 PM, Andy - KU4XR wrote:
> Well, I certainly can't argue with the experience you guys have.
> If this is the case, then one can't put much stock into the
> information on the manufacturers data sheet. Kinda makes for an
> easy way to waste money on false expectations... Still searching:
>
>
> Andy - KU4XR
>
>
> --- On Wed, 11/24/10, John Andrews<w1tag at charter.net>  wrote:
>
>> From: John Andrews<w1tag at charter.net>
>> Subject: Re: [Lowfer] 1 watt in class " AB " into 32 Ohm load, BW - 600 KHz, and it's an audio amp
>> To: "Discussion of the Lowfer (US, European,&  UK) and MedFer bands"<lowfer at mailman.qth.net>
>> Date: Wednesday, November 24, 2010, 3:45 PM
>> LM386's and LM380's are pretty
>> useless at 185 kHz. Awful waveforms, and
>> no where near their rated power in the audio range.
>>
>> John, W1TAG
>>
>> On 11/24/2010 3:24 PM, jrusgrove at comcast.net
>> wrote:
>>> That's just NJR's version of the old LM386. Can send a
>> couple of them to you via First Class Mail.
>>> Just say the word.
>>>
>>> Jay
>>>
>>> ----- Original Message -----
>>> From: "Andy - KU4XR"<ku4xr at yahoo.com>
>>> To:<lowfer at mailman.qth.net>;
>> "Part-15 Yahoo"<part15 at yahoogroups.com>
>>> Sent: Wednesday, November 24, 2010 2:48 PM
>>> Subject: [Lowfer] 1 watt in class " AB " into 32 Ohm
>> load, BW - 600 KHz,and it's an audio amp
>>>
>>>
>>> I have been trying to come up with a Linear circuit to
>> connect to
>>> the low level RF Out jack on my FT757GX-II that will
>> boost the
>>> 0.1 Vrms up to the 1 watt DC Input level for Part-15
>> lowFER work.
>>> Yes, there are " Boo-Koo's " of them out there, and
>> each with its
>>> own difficulties to incorporate; Transistor, Op Amps,
>> Audio Amps.
>>> And then I ran across this in a wide catagory parts
>> search:
>>>
>>> http://www.mouser.com/ProductDetail/NJR/NJM386BD/?qs=sGAEpiMZZMuMkwKcEjFF1DDb%252bMmvCPhMlz2Bffg3ciY%3d
>>>
>>> Data sheet is available on the product page. Very
>> intrigueing to
>>> me... The only thing that bites is; $ 1.14 worth of
>> parts for 2,
>>> and $ 6.50 to ship it... Uughh
>>>
>>> 73 all: and Happy Thanksgiving
>>>
>>>
>>> Andy - KU4XR - EM75xr - Friendsville, TN. USA
>>> LOWfer Beacon " XR " @ 185.29875 KHz
>>>
>>> Coordinates:  N:  35º 43' 54" - W:
>> 84º 3' 16"
>>>
>>> http://www.myspace.com/beaconxr
>>>
>>> http://ku4xr.webs.com
>>>
>>> http://lwca.org/community/YaBB.pl
>>>
>>> *** The 5 most important words ever spoken ***
>>>
>>> http://ku4xr.webs.com/5mostimportantwords.htm
>>>
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