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Old 26th September 2010, 02:20 PM   #41
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Regulated PSU is for single channel, two for stereo (dual mono). Stabil rail voltage is important for Reference Amplifier, it's simple PSU can be use for any DIY amplifier, and you can adjust different rail voltage for testing different amps.
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Old 26th September 2010, 03:56 PM   #42
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Default Regulated PSU Pcb

Pcb size: 135x87mm
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File Type: jpg APEXaudio Reg Amp PSU MON.jpg (164.3 KB, 3739 views)
File Type: jpg APEXaudio Reg Amp PSU PCB.jpg (183.6 KB, 3392 views)
File Type: jpg APEXaudio Reg Amp PSU.jpg (298.7 KB, 3177 views)
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Old 29th September 2010, 08:19 PM   #43
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This is Speaker Terminal with Zobel Network and triac DC protect, I recomand only this protect for Studio and Labs Reference Amplifiers.
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File Type: jpg APEX Speaker Terminal PCB.jpg (48.6 KB, 1132 views)
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Old 30th September 2010, 06:40 AM   #44
macd is offline macd  South Africa
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Default RE PCB Please........

Hello Apex,

Any progress on the PCB? I want to build this amp. What about "switch on delay"? Is this not needed for this amp?

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Macd
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Old 30th September 2010, 02:02 PM   #45
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Quote:
Originally Posted by macd View Post
Hello Apex,

Any progress on the PCB? I want to build this amp. What about "switch on delay"? Is this not needed for this amp?

Regards
Macd
I will share final pcb design for SR50 and SR200 after test. What version you want to build SR50 or SR200? Amp have no any click from speaker whan power switch on, and I don't want any relay contacts on signal path for Reference Amplifier. DC protect with triac and 'switch on delay' with mute input is the best solution.
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Old 1st October 2010, 06:50 AM   #46
macd is offline macd  South Africa
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Default RE PCB Please........

Quote:
Originally Posted by apexaudio View Post
I will share final pcb design for SR50 and SR200 after test. What version you want to build SR50 or SR200? Amp have no any click from speaker whan power switch on, and I don't want any relay contacts on signal path for Reference Amplifier. DC protect with triac and 'switch on delay' with mute input is the best solution.
Regards
Hello Apex,

I am interested in the SR200 version. I will build your power supply PCB and speaker zobal network so long.

Regards,
Macd
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Old 1st October 2010, 08:01 AM   #47
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Quote:
Originally Posted by macd View Post
Hello Apex,

I am interested in the SR200 version. I will build your power supply PCB and speaker zobal network so long.

Regards,
Macd
I suggest you to build switch on delay with mute input circuit from post #35 in thread: http://www.diyaudio.com/forums/solid...preamps-4.html
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Old 1st October 2010, 11:36 PM   #48
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Turn on/off mute with FET. Also can be add thermal protect with muting input over 90deg on heatsink.
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Old 2nd October 2010, 01:57 AM   #49
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FETs and 100k resistor is best to put on input terminal pcb or together with 'volume' pots, and 'mute' circuit on psu pcb.

Last edited by apexaudio; 2nd October 2010 at 02:00 AM.
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Old 2nd October 2010, 02:22 AM   #50
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My old amp have 'normal' and 'direct' inputs
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File Type: jpg APEX SR200 Sch.jpg (564.1 KB, 2265 views)
File Type: jpg apex%20power%20%286%29.jpg (56.8 KB, 2022 views)

Last edited by apexaudio; 2nd October 2010 at 02:26 AM.
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