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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Mon 01, 2016 3:03 am 
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Location: NorthWest TN.
Wow, this thing works great! Just on the breadboard and have to cut the gain real low to keep from overmodulating. My current radio on the bench is a 41 silvertone with pushbuttons and I set one to pickup the transmitter without fiddiling with the dial. And with the radio right across the room its easy to peak by ear. A big thanks to everyone who worked on this kit!

Attachment:
LM386 Tx Don 01 (Small).JPG
LM386 Tx Don 01 (Small).JPG [ 34.24 KiB | Viewed 5881 times ]

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Last edited by drmitch on Feb Sat 13, 2016 11:17 pm, edited 1 time in total.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Mon 01, 2016 3:21 am 
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Drmitch, which kit are you referring to?

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Mon 01, 2016 4:11 am 
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fifties wrote:
Drmitch, which kit are you referring to?

I'd assume the heading gives that answer...

Dr if you have the resistor and cap connected from pin one to eight, those can removed to reduce audio gain...


Tom


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Mon 01, 2016 5:18 am 
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Thank`s Tom I`ll try that.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Fri 12, 2016 8:34 pm 
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I planned to experiment with a batch of 1.544 SMD crystals I purchased, BUT I can't figure out which of the terminals to connect to get the correct configuration to replace my 1.228 crystal set-up. I see that positions 1 ( beveled term.) and 3 are in and out; and 2 is volts in?? with 4 as ground??. Also, I don't know the best way to mount these small units. Any help out there with SMD experience.

Thanks, Dale


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Thu 25, 2016 7:19 am 
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rxradio wrote:
I planned to experiment with a batch of 1.544 SMD crystals I purchased, BUT I can't figure out which of the terminals to connect to get the correct configuration to replace my 1.228 crystal set-up. I see that positions 1 ( beveled term.) and 3 are in and out; and 2 is volts in?? with 4 as ground??. Also, I don't know the best way to mount these small units. Any help out there with SMD experience.

Thanks, Dale

Late to the thread, I know, but...

I'd be a little surprised if your guess at the pinout is correct. All the SMD osc cans I've ever seen are the same as most through-hole can oscillators i.e.
Attachment:
SMD Osc Pinout.jpg
SMD Osc Pinout.jpg [ 7.56 KiB | Viewed 5827 times ]


Where Pin 1 is marked by a dot or chamfer, and :
Pin 1 - Standby (high or o/c = enable, low/gnd = disable)
Pin 2 - Gnd
Pin 3 - Output
Pin 4 - Vdd (+ve)

DIP-packaged oscillators are usually the same pin layout too - just that the pin numbering follows DIP package conventions.

What make/model or supplier/part# are the ones you're using?

For prototyping/breadboarding or a through-hole board, I'd simply solder short lengths of solid hookup wire to the pads - it's not going to be a problem at broadcast band frequencies. Depending on the size, you could probably mount one on a SOIC-8 or SSOP-8 to DIP adapter board if you wanted something more permanent.


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Feb Thu 25, 2016 3:50 pm 
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Thanks, Rod...exactly what I needed. Now, I'm off and running. Much obliged. I don't have a part number, just some Chinese SMD I wanted to try to replace the standard 1.228 and 1.000 KC plug-in oscillators.

Dale


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Mar Wed 16, 2016 9:46 pm 
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Reading a little of this thread, it sounded like there were plans to produce this as a commercial kit. Is that still the case, or did I misunderstand?

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Mar Wed 16, 2016 11:57 pm 
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Bill Hamre has a kit of most of the parts but AFAIK he's still wintering out in the Atlantic...

There was a member that produced a board and case and was selling a completed unit, of course he was run off cause we can't be selling built transmitters here on ARF... They were for sale on ebay, dunno if they still are...


Tom


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Mar Thu 17, 2016 1:12 pm 
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Now had the member left the TCXO out and provided a socket for it, would it then have been legal since it is technically not a completed product?

Didn't another member here make a board for the LM-386 or was that a tube transmitter I was thinking about?


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Apr Thu 07, 2016 8:52 am 
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Location: Clayton, Ind.
Looking at Mouser for some LM386N - obsolete, not in stock.

They have some Ms, MXs, MMXs.

Do those work here? Thanks.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Apr Thu 07, 2016 3:59 pm 
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AFAIK any LM386 will work, as updates/changes are made the suffix changes...


If you want L there are 1000s on ebay...


Tom


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Apr Thu 07, 2016 8:53 pm 
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I think I bought 10 of them on The Bay last year for a buck. Looking there now, cheapest is 87 cents for 10, with free shipping. PRC seller, naturally.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: Apr Thu 07, 2016 9:30 pm 
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I bought 10 also. http://www.ebay.com/itm/151820386186?_t ... EBIDX%3AIT


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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Mon 16, 2016 7:04 pm 
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Location: aston, pa, usa
I'm thinking of adding the 1,228 osc and correct choke as a two part kit for any one stuck with the 1,000 in a bad frequency city. PM me if interested.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Tue 17, 2016 2:28 pm 
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Only one taker so far. I'm making a list as I'll be ordering in just these parts in the end.

EDIT: You might want to get these two parts in a #10 envelope and throw them on the bedroom closet shelf just in case you ever need 1,228 in the future. OR, someone your mentoring on here might need them someday.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Tue 17, 2016 5:02 pm 
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If possible try to get crystal oscillators which end in "0". A 1,228 oscillator will work for our older radios but new digital radios tune in 10 increments. Not sure what would happen with a station on "8"? Probably some distortion.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Tue 17, 2016 5:22 pm 
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Ok, thanks for the heads up Norm.

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Tue 17, 2016 8:21 pm 
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Norm Leal wrote:
If possible try to get crystal oscillators which end in "0". A 1,228 oscillator will work for our older radios but new digital radios tune in 10 increments. Not sure what would happen with a station on "8"? Probably some distortion.

I built an AM transmitter from a kit sold by a Japanese seller on eBay, using a 1308 Kc fixed output frequency. It works just fine on digital radios, perhaps because of the close proximity (within 150 feet or so).

http://www.ebay.com/itm/1308kHz-Amplitu ... Swv0tVOdAQ

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 Post subject: Re: LM386N MK-XI BCB Transmitter
PostPosted: May Fri 20, 2016 2:21 pm 
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Location: aston, pa, usa
If possible try to get crystal oscillators which end in "0". A 1,228 oscillator will work for our older radios but new digital radios tune in 10 increments. Not sure what would happen with a station on "8"? Probably some distortion.

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Norm
---------------------------------------------------------------------------------------------------------------------------
Anybody tried the 1,228 osc in the 386 broadcaster using digital radio on say 1,230? Just curious about findings.

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