lm1875 fizzing away probelm

[PetruV]

Im 13 but i have been woking with 220v since i wad 9 so im very experienced

 

[PetruV]

- did the attenuator work ok?

No it didnt the buzz is still there,but only when something is hooked up to it

 

[PetruV]

No it didnt the buzz is still there,but only when something is hooked up to it

whoops i think it is so because i had pu it the wrang way around

 

[PetruV]

Blu glo your attenuator was a piece of crap causing a lot of noises,sorry for sounding rude but thats the truth

 

[PetruV]

Actually the probem is because of the crappy rca cabble not carriing ground,those rca to 3.5mm cables are expensive and hard to find so my friend is not going to be able to get a working birthday present from me

 

[PetruV]

Vacum tubbes !!!

Can i do anything with these things?

 

[PetruV]

ALSO can anyone sugest a good simple class a amp using these small transistors, i have some bigger ones,but show me your schematics first

 

[PetruV]

The best one of the transistors seems to be the c8050 at 1.5 a max
Again no answers? sad face

 

[PetruV]

The fastest and easiest thing to do is put a 0.1uF capacitor in parallel with 22-100 ohm resistor between 0V RCA inputs and the metal chassis. The metal chassis should be earthed at all times, please see my above post about working with mains.

That would get me into a ground loop,i aleardy cut the ground wire to my computer psu which powers my amps to stop this pluss that amp dosen have a ground plug

 

[picowallspeaker]

PetruV we're happy to know that you're still alive !

 

[PetruV]

PetruV we're happy to know that you're still alive !

i got zapped a million times from my computer psu building a static charge

 

[PetruV]

I made an amp with this schematic and c8050 and it draws to much current from the input causing my test radio's power led and display to dim with the beat that not happening when there is nothing hooked up to the radio or the volume turned down,the radio has an inbuilt speakers which turn on when the jack is unplugged
Ps the transistor dosent even get warm

 

[PetruV]

noanswers sad face

 

[PetruV]

Just finished my lm1875 when i power it up it makes a buz and raws a lot od current,the power led goes dim,but if i turn it off and on in an instant the led goes bright the test lamp goes bright for a split sec and everithing is ok,could this be because of the lightbulb limiting the current ant the chip amps drawing a lot of current during power up causing it to kinduf run out of power and try and start and run oout of power and start up infintely

 

[PetruV]

It causes the radio that i test it with to lose signal when i plug it in the amp,maybe because the center tap of the transformer is used as ground

 

[PetruV]

why ARENT ANY ANSWERS IS EVERIBODY DEAD SAD FACE

 

[PetruV]

I finished it and its working and im proud of it i have
DONE IT MYSLEF
Or as tekko would say MY LIFE IS COMPLETE
but lets dont stop here i got to make a transistor amp and a high power 5.1 amp using an apex b500 or something like that for the sub chanel.That would require one hell of an transformer,But stay tuned for more!

 

[PetruV]

Just listening to it and the trebles are amazing but the bass is weak ,also the mids are very spatial,but there is an small distorsion which sounds weird maybe beacause the wires are bundled togheter to close,By far the best amp i ever heard,even better than my computer psu tda 8560q which led the previous record soundig better than the 1000 of dolars sound systems i had heard ove the years.
The lm1875t is weak,not very bassy altough used in an sub plate amp i have
But the other sounds are amazing and spatial,but that distorsion bugs me a lot

 

[PetruV]

no answers














sad face

 

[PetruV]

Any answers