strawa 50W

sith · 27th April 2006, 02:01 PM

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

http://sound.westhost.com/project3a.htm

Hi,

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

/sreten.

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

Quote:

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

Quote:

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...

jacco vermeulen · 28th April 2006, 08:16 AM

Sith,

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.

27th April 2006, 10:59 PM	#9
sith diyAudio Member Join Date: Nov 2003 Location: Split	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... __________________ There is no spoon...there is a fork!!!

28th April 2006, 08:16 AM	#10
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Sith, 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. __________________ Looks like Sponge Bob has killed another thread.

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27th April 2006, 02:23 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://sound.westhost.com/project3a.htm Hi, take a look at the above, at least it works. /sreten.

27th April 2006, 03:20 PM	#3
davidallancole diyAudio Member Join Date: Nov 2005	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.

27th April 2006, 03:27 PM	#4
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	Its been a long time since I last saw a 741 used. This will be really horrible.

27th April 2006, 03:45 PM	#5
davidallancole diyAudio Member Join Date: Nov 2005	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.

27th April 2006, 04:51 PM	#7
davidallancole diyAudio Member Join Date: Nov 2005	sreten, why do you think it won't work for long?

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