400w DARLİNGTON AMPLİFİCATOR 2 ohm STABLE

[erhan739]

Hİ there, i'm posting a darlington amp for al diyers. all files attached. enjoy!
give 2x50v take 400w give'n take simply.

 

[aldemarar]

because they never place the scheme?

 

[Lira]

Hi, i have one doubt of this amplifier; a 380VA toroid transformer (37V 0 37V 10A) is suficient for two channels?

Thanks in advance

Lira

 

[erhan739]

lira, your transformer is good but current is a bit low, you can work half load

 

[Lira]

Thanks for your quick reply,

I build one for 2 channels driving 4ohms speaker each, the sound is very good but there is a hiss noise that i´m not identifing where it came from, do you have any idea?

Thanks in advance

 

[erhan739]

LIRA, ı must know where do you using this... in a car or home or etc... and how to driving sound... by a preamplifier or directly.... becaue this circuit tried on my location diffrent builders they haven't any problem but ı'll care of this case.

 

[Lira]

I'm using this pré amplifier http://construyasuvideorockola.com/d_premic.php with a little modification, i just ommited the mic input on the circuit, I tried using TL072 and NE5532, its connected to my computer via Maudio Delta, the PSU for the preamplifier is separeted, +15 0 -15 regulated with LM7815 and LM7915. The main power supply is that toroid transformer from the last post with 20000uf per rail, and rectified with MUR860 diodes. I have checked the cables and all the connections and i don´t know why i still have that noise. I´m considering changing the TIPS. The use for this is 2 PA Boxes with each one with 1 15'Woofer, 100w driver and 50w tweeter (all from Selenium).

Thanks for your attention

 

[Sierra]

I'm using this pré amplifier http://construyasuvideorockola.com/d_premic.php with a little modification, i just ommited the mic input on the circuit, I tried using TL072 and NE5532, its connected to my computer via Maudio Delta, the PSU for the preamplifier is separeted, +15 0 -15 regulated with LM7815 and LM7915. The main power supply is that toroid transformer from the last post with 20000uf per rail, and rectified with MUR860 diodes. I have checked the cables and all the connections and i don´t know why i still have that noise. I´m considering changing the TIPS. The use for this is 2 PA Boxes with each one with 1 15'Woofer, 100w driver and 50w tweeter (all from Selenium).

Thanks for your attention

Very nice

Can you post some pictures?

 

[erhan739]

oh man, you're on the our job! i like your working style and i must see your pictures because ı'm interesting beyma like you

 

[Lira]

Ok, i think i cam post some pictures on the weekend, I'm bulding another pre amp, using a pcb that was built by a friend, and I have ordered some new tips 142 and 147, hope it will come by wednesday, hope it will fix the hiss, I,ll post the results. I just changed to amplifiers 2 years ago, and i'm facing a lot of throuble because of lack of experience, but i like it very much. I used to build my own speakers.

Thanks

 

[erhan739]

Okay on you, also you shuld check BD 900 series because too many here 2nd quality on my location.. or any drive transistors but if you have a scope, you can give constant signal and you can catch issued section.

 

[Lira]

Hi, I´m not sure what i did but i burned 2 pairs of the output transistors and also messed up my board... I have to etch a new one...

 

[erhan739]

if you will use the amp at full range you can check my other projects..

 

[Lira]

It's a bit wierd but i found the problem, the BC556 near the resistor 3.3k was creating that hiss, now the sound is clear and perfect! (At least of one channel that survived). I have to buy a new osciloscope, mine is just working one channel, i´ll clean all that mess and post some pictures on the weekend. Thanks for all your help!

By the way, your amplifier is the best amplifier based on tip142 and tip147, i have built several others but none of them worked well, yours is very simple and stable, most of amplifiers based on Darlingtons are unstable.

Thanks!

 

[erhan739]

ı'm glad to choose my projects.. and ı'm glad to satisfacted from them thanks for choice and lastly, We find a lot of darlington output stages but most of aren't working stable(except that ) and my friends re-drawed for diyers . And if you want protection circuits ı'll help you...

 

[Lira]

Sorry for not posting any pics, it's because the tips(142 and 147) didn´t arrived yet, so its not completely finished. By the time i finish I'll post some pics.
Thanks

 

[erhan739]

lira, you need a fan circuit this circuit al lot of heats if you want i will give you

 

[erhan739]

lira, you need a fan circuit this circuit al lot of heats if you want i will give you

 

[Lira]

I just notice one thing, it's umbelievable how the uFe varies on the bc556, and some cause that hiss noise...

about the fan circuit, SURE i really need it, I almost finishing this amp! Thanks!

 

[erhan739]

Anddd if you can make this circuit, you will fully finish your project... HERE: