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11th April 2011, 12:16 AM
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#1 |
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diyAudio Member
Join Date: Oct 2009
Location: Hong Kong
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5W Single Ended Class A Power Amp From Mark Houston
I have built this 5W Class A power amp designed by Mark Houston and feel happy with it's sounding performance. I am wondering now if I could use 2SK1058's complementary pair 2SJ162 to build one more power amp as the supplier sell them together. Please advice.
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11th April 2011, 07:04 AM
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#2 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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You can replace resistor 15R with a current source based on 2SJ162.
It should give like 0.8A current. You need 2 resistors and a transistor besides 2SJ162. See diagram This will improve the amplifier considerably.
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11th April 2011, 12:09 PM
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#4 |
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diyAudio Member
Join Date: Apr 2011
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nice for head phones
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11th April 2011, 12:27 PM
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#5 |
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diyAudio Member
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I think SSDIY is looking for a way to build another amp not improve this one. The answer lies in using the complimentary part as an active device with resistive load of course, only you have to put the active device on top and the resistor underneath.
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"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig. |
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11th April 2011, 01:03 PM
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#6 |
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diyAudio Member
Join Date: Nov 2010
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Hate to disappoint, this is not a 5W amp, 1 W rms is closer.
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11th April 2011, 01:06 PM
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#7 |
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diyAudio Member
Join Date: Nov 2010
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With the constant current mod, it will come up to 2.5W rms.
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11th April 2011, 04:22 PM
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#8 |
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diyAudio Member
Join Date: Oct 2009
Location: Hong Kong
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Hi guys
Thank you for all your inputs. What I mean is to replace the 2SK1058 by 2SJ162 and apply a -24v to it. Other parts and components remain unchanged. Would the circuit work properly with this change? Please advice. |
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11th April 2011, 05:35 PM
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#10 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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Here is a version for 2SJ162.
Note that power supply V+ is connected to GROUND. And so GROUND is the upper part. But as long as you note polarity of electrolytic capacitors it should not be a problem. A stereo system should be 2 such with 2SJ162 as 2SK1058 has a bit different caracteristic from 2SJ162.
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