michael1978
- Mar 17, 2012
- 388
- Joined
- Mar 17, 2012
- Messages
- 388
oh sorry i misunderstand you, what do you mean with trim?What part of "trim the leads" did you think meant "add more solder"?
oh sorry i misunderstand you, what do you mean with trim?What part of "trim the leads" did you think meant "add more solder"?
oh sorry i misunderstand you, what do you mean with trim?
no i think leesoh sorry i misunderstand you, what do you mean with trim?
Rely the leads of transistor or capacitor resistor, to cut shorter, ah i gonna do it thnxCut them off shorter
Yes all components are in rights positionThere 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?
Hi i make it, but nothing changes...…….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?
ooh my god, but what do you think, maybe the board is bad? because like i say before, i did the test like they say in book(i mean with dmm) everythink was correctAaaah, that's a better image.
It appears that your solder joints are very poor. You need to Google for how to solder and go over each joint and fix them.
thnx manThe solder joints look like balls on top of the pads rather than smooth solder joints. They look like the pads were insufficiently heated and the solder did not flow over them.
It only takes one bad joint to stop the circuit working, I suspect you have some.
Hi Edd, that problem is not anymore, ii hear only low low noise, and i tune and R20 its stal 1.6V and when i toch the pot where is solder it with finger it comes more noise, i dont understand after R20 it stay at 3.16V, maybe something with pot, problem ( i just think) because the same noise for am and fm, because when i dont touch there is low low noise, what do you thinkSir michael1978 . . . . .
You say:
when I switch to . . . . . .fm, i just hear high noise
Two tests:
Have the unit working and hearing your rush noise from the speaker in the receivers FM mode.
Then power down and lift one lead wire of R25 from making its connection to the board.
If that noise then stops, when you power it up again, the LM386 associated circuitry seems to be working OK.
If that noise remains, it seems like you might be having some type of oscillation within your LM 386 circuitry..
To evaluate if your FM RF portion is working, take DVM in DC voltage mode and at voltage setting level that gets an in circuit reading..
Constantly measure the voltage being read across R20 and slowly tune from one end of the FM band to see if there are rises and declines in the voltage reading, as you tune onto and then off from each FM station,which signifies being responded to..
That should then isolate / relate the basic problem as being an audio output stage / or / FM receiver portion area of problem.
CONFIRMED . . . .those excess lead length stubs are just an accident waiting to happen . . .with 2-3 mm excess being the norm.
73's de Edd
.....
Hi Kellys, when i cuts a leads shorter, i dubbel check are all components connected, so when i put the hand to pot or capacitor, they change the noise make it more noise, i desoldeer on capacitor and i put new, again the same problem,Soldering. Entirely down to poor soldering.
Fix the soldering and it will (possibly) just work.
Hi, i desoldeer all the party of AM, and i soldeer it again beter, and i change LM386 and holder and also al capacitors lytics, , and i solder again no result, so i desoldeer also the potenitomer, now when i rotate i hear voice low and high, but but not so high, and i get no signal, what do you think did i connect maybe the vcapacitor bad or the coil(is not correct like in book is with four wire and i measure i dont get the resistance show it in book, what do you think whats the porblem, what to do anymore? This AM first to fix it?Resolder ALL the wires, components and connections then post a new picture of the soldered board.