Hi, have anyebody had trouble building the ELENCO 108 AM/FM RADIO KIT

[michael1978]

Hello, i build the radio like they say in the book, and i did everything with VOM(testing with only multimeter),
everything was like in book , but when i finish, i switch to am or fm, i just hear high noise

I Measure, Test Point, without connection a speaker(because i thought the speaker was bad, so i desoldeer, and i connect with wire other speaker 8ohm but the same problem stays),
so
i switch to FM
tp15 and tp2=2.74V
tp15 and tp13=1.4V
tp15 and tp11=6.59V
tp15 and tp10=1.20V
tp15 and tp9=7.08V
tp15 and tp8=6.43V
tp15 and tp12=6.74V
i switch to am
tp15 and tp2=0.02V
tp15 and tp3=7.77V
tp15 and tp1=4.21V
tp15 and tp4=8.13V
tp15 and tp5=1.34V
tp15 and tp6= 8.7V
tp15 and tp14'=0.02V
TP15=GND

 

[kellys_eye]

Schematic?

Usually, with these self-build kits, it's nearly always a mistake with assembly.

Double-check everything.

 

[michael1978]

Schematic?

Usually, with these self-build kits, it's nearly always a mistake with assembly.

Double-check everything.

I test it, but what do you thing, it can be maybe from lm386, because i soldeer it direct without the holder(socket)?
it possible that i destroyd lm386? AND FOR THAT IS NOT WORKING

 

[davenn]

I test it, but what do you thing, it can be maybe from lm386, because i soldeer it direct without the holder(socket)?
it possible that i destroyd lm386? AND FOR THAT IS NOT WORKING

Again ... you were asked for schematic

 

[kellys_eye]

The LM386 isn't a static sensitive device and you'd have to really butcher your soldering to overheat it. Assuming you soldered it in the correct orientation it is probably ok.

 

[michael1978]

The LM386 isn't a static sensitive device and you'd have to really butcher your soldering to overheat it. Assuming you soldered it in the correct orientation it is probably ok.

Yes in correct place i soldeer it, but what for problem is? what do you think?

 

[michael1978]

Here is schematic, if somebody can help me, now i change something and only low noise no signal

 

[kellys_eye]

Show a (clear) picture of the assembled board.

 

[michael1978]

Show a (clear) picture of the assembled board.

i can show you tomorow no problem?

 

[KJ6EAD]

The kit manual:

https://www.elenco.com/wp-content/uploads/2017/10/AMFM-108CK_low-res-2.pdf

 

[michael1978]

The kit manual:

https://www.elenco.com/wp-content/uploads/2017/10/AMFM-108CK_low-res-2.pdf

thnx man i buy compleet kit, so i did step by step, but is not working

 

[(*steve*)]

i change something and only low noise no signal

Wow, that's helpful.

 

[michael1978]

Wow, that's helpful.

yes but he does not work...……..

 

[michael1978]

Show a (clear) picture of the assembled board.

Hi, i did not make so good picture, so i make a photo, i dont have photoshop to change a little bit contrast,
here is the picture

 

[(*steve*)]

You need to take photos we can use. Have a look here for information on taking good photographs.

You're probably also going to have to note the part numbers of components (like transistors) where we won't be able to see them on your photo.

 

[michael1978]

You need to take photos we can use. Have a look here for information on taking good photographs.

You're probably also going to have to note the part numbers of components (like transistors) where we won't be able to see them on your photo.

This the best i can do

 

[(*steve*)]

There is a lot of motion blur in those photos, so they aren't really useful.

What I can see is that you seem to have filled leads over before soldering them, and have failed to trim them properly.

I recommend that you trim the leads, and then take photos where the light is better, or find a way of ensuring the camera doesn't move during the exposure.

Meanwhile, have you checked every component to make sure you put the right ones in the right places?

 

[michael1978]

There is a lot of motion blur in those photos, so they aren't really useful.

What I can see is that you seem to have filled leads over before soldering them, and have failed to trim them properly.

I recommend that you trim the leads, and then take photos where the light is better, or find a way of ensuring the camera doesn't move during the exposure.

Meanwhile, have you checked every component to make sure you put the right ones in the right places?

You mean to put a little bit soldeer?, i was think it is more good if you soldeer it like this

 

[michael1978]

There is a lot of motion blur in those photos, so they aren't really useful.

What I can see is that you seem to have filled leads over before soldering them, and have failed to trim them properly.

I recommend that you trim the leads, and then take photos where the light is better, or find a way of ensuring the camera doesn't move during the exposure.

Meanwhile, have you checked every component to make sure you put the right ones in the right places?

I forget to tell you, when i did step by step like in book, i have measure everything was like in book the result, but i dont know what wrong

 

[(*steve*)]

You mean to put a little bit soldeer?,

What part of "trim the leads" did you think meant "add more solder"?