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Old 11th April 2013, 09:23 AM   #231
AndrewT is offline AndrewT  Scotland
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AC on the output when the input is shorted is noise.
It can be hum and/or white noise.
Try loading the input with different resistors. I keep dummy load RCA's for just this testing: 0r0, 100r, 1k, 10k, 100k in pairs. Use cheap plastic RCA plugs.

AC noise on the output is not output offset.
DC on the output is output offset.
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Old 11th April 2013, 12:00 PM   #232
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Quote:
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Not about that... Just in case the copper is not sealed, stupid things can happen, mostly during testing. Even if the chance is small, when expensive speaker is used, that chance must be eliminated.
I get what is being said. I'm not too concerned about such things, others may feel differently. By the time the amp ever gets connected to my primary system it is already tested and in an enclosure. At that point the risk is essentially mitigated. My 2.
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Old 12th April 2013, 09:00 PM   #233
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Argh, just stopped into the local print shop to pick up my film to find they created a negative instead of a positive. All my pre-sensitized boards and my developer are positive chemistry. No PeeCeeBee's will be etched this weekend
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Old 13th April 2013, 09:45 AM   #234
naf is offline naf  Indonesia
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Finishing 3 pairs peeceebe of bc550/560 version
1 pairs for me, 2 pairs going to my friend.
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Old 13th April 2013, 10:56 AM   #235
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Originally Posted by naf View Post
Finishing 3 pairs peeceebe of bc550/560 version
1 pairs for me, 2 pairs going to my friend.
Hi Naf, nice.. very neat your pcb

I bought parts for 2 channel of peeceebee except bc550/bc560 because no available. I have ordered bc's..2sa/2sc still singing naf may I request also the bc550/560 peeceebee version? Thank you.

Regards,
Boyet
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Old 13th April 2013, 11:07 AM   #236
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Hi Shaan,

I have defective sr4300 marantz and I plan to use the power supply -50v +50v.
What value will be changed in the schematic of peeceebee? I do hope your reply my inquiry. Thank you.

Regards,
Boyet
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Old 14th April 2013, 06:30 PM   #237
ALAZ is offline ALAZ  Iran
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it is my qustion too and how much watt produced in + -50 volt in 8/4 ohm speker
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Old 15th April 2013, 03:02 PM   #238
Paulv is offline Paulv  France
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Default my project of VSSA

... with FET curant sources: better stability vs supply voltage, R4 and R5 to limit voltage (and heat) across fets, R9 to fine tune V offset (I will first put a variable resistor then replace with a fixed one)
different supply voltage for input and VAS (use of SMPS 800RE)
10x gain (I bought udj6 6 ways soundcard with 3 volts peak).

and since my project is active speakers the corresponding PCB for two channels on one board, common VAS supply, common VAS ground, separate ouput grounds.
PCB size 60mmx200mm
I'll be ordering PCB quite soon, GB possible ....
any comments?
cheers
Paul
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Old 16th April 2013, 12:58 PM   #239
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Mr.Shaan goodnight, when you publish peeceebee VSSA .. because my friends and fellow DIYers wait layout and component layout by shaan version. there a change in layout and component layout?
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Old 17th April 2013, 04:55 AM   #240
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I'll be ordering PCB quite soon, GB possible ....
any comments?
I have one pair each of Exicon ECX08N16-Z/ECX08P16-Z and like your version of VSSA, especially practicality since both channels are on one pcb. Could you provide one pcb for me? I shall contact you with PM for payment.
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