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reggy (Dreamglider)
New member
Username: Dreamglider

Post Number: 1
Registered: 4-2007
Posted on Wednesday, April 18, 2007 - 3:01 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Good day
My friend asked me to help him build his radio and i did, we built it on a piece of wood and a couple of small nails, and it works very will indeed.
Now he also asked me to help him put together the IC Amp and i tried but it sounds very bad and there are a couple of parts leftover.
Now to the am voice transmitter, the transformer in that kit should be 1000Ohms/8Ohms but it did not work so i tested it and itīs 53ohms/2ohms.

Can i get the schematicīs for the tree kitīs.

i will post picīs on my site later.

best regards
Reggy
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Simon Quellen Field (Sfield)
Senior Member
Username: Sfield

Post Number: 1685
Registered: 12-2004
Posted on Wednesday, April 18, 2007 - 5:22 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

The ratings are impedance at 1,000 hz, not DC resistance.
So your ohmmeter will not show you what you need to know.

The schematic for the IC amplifier is straight out of the
manufacturer's data sheet:
"http://cache.national.com/ds/LM/LM386.pdf".
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reggy (Dreamglider)
New member
Username: Dreamglider

Post Number: 2
Registered: 4-2007
Posted on Wednesday, April 18, 2007 - 7:12 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

good evening
Ok my bad. could you mesure the DC resistance on the trafo and post me the results please.

Ok we will have a look at the LM386 datasheet thanks for the link.
(do you know where i can get the LM386 for MultiSim ?)
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Simon Quellen Field (Sfield)
Senior Member
Username: Sfield

Post Number: 1686
Registered: 12-2004
Posted on Wednesday, April 18, 2007 - 8:00 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

Knowing the DC resistance doesn't tell you anything you need to know.
Likewise, what color it is will most likely not be an important thing
to know.

The side with three legs is the high impedance side.
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reggy (Dreamglider)
New member
Username: Dreamglider

Post Number: 3
Registered: 4-2007
Posted on Saturday, April 21, 2007 - 2:55 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

i would like the LM386 component for multisim does anyone know where i can find it.
Thanks in advanced.
Regin

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