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Another quasi-complementary design
Another quasi-complementary design
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Old 31st October 2005, 11:14 AM   #91
quasi is offline quasi  Australia
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Default And the tracks

The track side.

Also if you build the amp please make contact so I can offer some advice on setting it up (before you turn it on).

Good Luck & Cheers

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Old 31st October 2005, 06:02 PM   #92
pejinm is offline pejinm  Serbia
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It looks like it's something wrong with the attachment!?
I can't download it...
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Old 4th November 2005, 12:05 PM   #93
quasi is offline quasi  Australia
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Default Dunno what happened with the attachments

....but I'll try again.
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File Type: pdf actrk nchan lp 1v3 layout.pdf (45.9 KB, 560 views)
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Old 4th November 2005, 12:07 PM   #94
quasi is offline quasi  Australia
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Default And the tracks ....

Please check against the schematic before building....
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File Type: pdf actrk nchan lp 1v3 tracks.pdf (24.8 KB, 435 views)
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Old 4th November 2005, 12:20 PM   #95
quasi is offline quasi  Australia
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Default Aaaahhh Phooey....

.
The schematic posted earlier in the thread for the high power version is incorrect. The second constant current source transistor (T6) is shown connected in reverse. It is corrected in this schematic.

Sorry.......
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File Type: pdf artck nmos hp 1v3.pdf (49.3 KB, 683 views)
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Old 4th November 2005, 07:27 PM   #96
pejinm is offline pejinm  Serbia
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Thanks Quasi...
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Old 4th November 2005, 08:08 PM   #97
mastertech is offline mastertech  Australia
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Hey quasi My name is mastertech you are all very good quasis
i havent seen one of yours i havent liked

btw have you ever built a quassi running in class-a

thanks and out
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Old 4th November 2005, 11:11 PM   #98
quasi is offline quasi  Australia
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Default Quasi class A

Quote:
Originally posted by mastertech
Hey quasi My name is mastertech you are all very good quasis
i havent seen one of yours i havent liked

btw have you ever built a quassi running in class-a

thanks and out
Thank you Mastertech.

No I haven't. No reason why this design could not run in class-a though.

Using the low power module the changes I would make would be;

1. Lowering the main rails to around 25 volts
2. Lowering the secondary rail to 35 volts
2. Shorting R7
3. Reducing the gain (R13 / R11)
4. Cranking the bias current up to 3 amps or so (ouch).
5. Big heatsinks (150 watts will be dissipated continously per module)
6. A huge regulated & noisless power supply capable of 6 amps. ( x 2 for stereo ).

Voila ...one 35 watt class-a amp.

The above is for a practical amp ....of course you could leave the rails as they are .....but I'm sure you have adequate heating in your home. Still it would be awesome.

Cheers
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Old 5th November 2005, 03:17 AM   #99
mastertech is offline mastertech  Australia
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thanks quassi
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Old 5th November 2005, 04:34 AM   #100
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Hi Quasi,

have you encountered Thermal Drift in your amplifier...

regards,
K a n w a r
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