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Old 25th June 2012, 10:27 AM   #1
hiktaka is offline hiktaka  Indonesia
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Default Single BJT amplifier ?

Hello,

Just found a schematic
Click the image to open in full size.

Is this circuit are reasonably usable? (Other than being only experiment).

The speakers are efficient enough ~90-95dB/W. And we are not expecting something too loud..

Thanks,
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Old 25th June 2012, 10:34 AM   #2
AndrewT is offline AndrewT  Scotland
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It's AC coupled, so will not damage your speaker.
Experiment as much as you like.

The schematic does not show a Signal Return/Ground.
Do you know how to connect this "amplifier" to a Source?
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Old 25th June 2012, 11:41 AM   #3
AKSA is offline AKSA  Australia
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Yes, it will work, and although gain and power will be very restricted (just over 1 watt with 18V supply) and drive will be limited (source impedance will be close to the 50R collector resistor, so no damping factor to speak of with 8R loads) the sound quality will be quite good, dominated by H2 and H3.

Hugh
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Old 25th June 2012, 12:21 PM   #4
tsiros is offline tsiros  Greece
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from what little i know, i've understood that these kinds of amplifiers are used only in textbooks teaching transistor circuits and have no practical purpose otherwise.

aksa, what is H2 and H3? second and third order harmonics?
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Old 25th June 2012, 01:42 PM   #5
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I've built all three of the circuits that were shown in the pdf that you found. Here is a link to some of the correspondence that happened.

Simple amp circuit obsevations

It was a great learning experience and the responses from the people on this forum were really helpful. This is a really good forum.

Tom
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Old 25th June 2012, 11:01 PM   #6
AKSA is offline AKSA  Australia
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Hi Tsiros,

Yes, second and third harmonic......

Hugh
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Old 26th June 2012, 08:15 AM   #7
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Quote:
Originally Posted by AKSA View Post
Hi Tsiros,

Yes, second and third harmonic......

Hugh
This topologies are also good for the investigate of this transistor types from various brands and various time aeras because the absense of a G-NFB network.
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Old 21st February 2013, 08:49 PM   #8
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Originally Posted by AKSA View Post
Yes, it will work, and although gain and power will be very restricted (just over 1 watt with 18V supply) and drive will be limited (source impedance will be close to the 50R collector resistor, so no damping factor to speak of with 8R loads) the sound quality will be quite good, dominated by H2 and H3.

Hugh
Hugh:

The output power at 8 ohms and 18 volts is not more than 0.096 W RMS.

regards
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