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sith 27th April 2006 02:01 PM

strawa 50W
2 Attachment(s)
Hi there, found this one over the internet, called Strawa50W...

Comments please, suggestions... any kind of help is welcome...

sreten 27th April 2006 02:23 PM


take a look at the above, at least it works.


davidallancole 27th April 2006 03:20 PM

This circuit will work. As shown, it will operate in class B so it will have crossover distortion thus sounding pretty bad.

You could take the 100 ohm resistor that is between the diode and the 3.3k resistor and change it to 390 ohms (based off simulation) or even put a potentiometer in there so you can adjust the bias.

davidsrsb 27th April 2006 03:27 PM

Its been a long time since I last saw a 741 used. This will be really horrible.

davidallancole 27th April 2006 03:45 PM

I don't mind amps built with the 741. I built a class A using the 741 and it sounded excellent. I also have a stereo Pioneer amp that uses a dual 741, and it sounds very good as well.

sreten 27th April 2006 04:50 PM


Originally posted by davidallancole
This circuit will work.
Not for very long IMO, :)/sreten.

davidallancole 27th April 2006 04:51 PM

sreten, why do you think it won't work for long?

darkfenriz 27th April 2006 09:20 PM


Originally posted by sreten

Not for very long IMO, :)/sreten.

You mean, that most amps don't survive being thrown out of a window?

sith 27th April 2006 10:59 PM

well, this circuit actually works, atleast as I saw on web page where I found it, and they say it works good, still , I'm reluctant bout it... :xeye: :confused:

jacco vermeulen 28th April 2006 08:16 AM


for most of us the powersupply, heatsinks, and the case of an amplifier are the parts that cost the most to construct an amplifier.
And that's without counting the time you put into it.
The parts and pcb's of the amplifier circuit is a relative small part of the total cost, putting time and money in a crappy circuit is a waste.
My reaction to the circuit you posted is: Yikes !
If you are thinking of constructing an opamp entrance amplifier, there have been so many designs since the mid 1980s, why bother with something so horrible.
Even an LM or TDA chipamp module will be easier and sound better.

Just love your dry sense of humor, DarkFenriz.

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