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

[Paul Daulton]

There are four versions of the LM386, -1 -2 -3 -4 . The dash 4 is rated 
at 18volts -1 is 6v -2 is 9? -3 is 12v. 
Most of those on the market surplus are -1. Some of the ne602/386 
direct conversion designs got a bad reputation running the 386 at 6 
volts where the power is limited and clipping easily occurs with the 
-1. I prefer to run a -4 at 12 volts. 

Better choice is the chip Lawrence used in his exciter. I think it is a 
tda7052. It will put out the 1 watt at 185khz. Class A, B or AB is 
easily achived with common transistors. good example is Asshar Farhans 
JBOT amp( just a bunch of transistors). Google jbot and you should find 
it . With proper torroids should be able to work 1 to 5 watts at 185khz. 

good luck with your project. 

Paul k5wms

Quoting jrusgrove at comcast.net:
> 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
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Lowfer mailing list
> Home: http://mailman.qth.net/mailman/listinfo/lowfer
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Lowfer at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Paul Daulton K5WMS
beacon WMS 185.302 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu