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Old 27th December 2011, 10:48 AM   #3281
generg is offline generg  Germany
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Sent you PM..

please look
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Old 27th December 2011, 10:53 AM   #3282
generg is offline generg  Germany
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o.k. once again....
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Old 27th December 2011, 10:55 AM   #3283
generg is offline generg  Germany
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mind the different pins of the regulators...

I suggest we go better to PM communication because we are a bit away from B1....... O.K.?
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Old 27th December 2011, 10:58 AM   #3284
AndrewT is offline AndrewT  Scotland
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Simply use 317/337 for alternative or adjustable, regulated voltages.

The 79xx and 78xx series were designed for fixed regulated voltages.
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Old 27th December 2011, 11:05 AM   #3285
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I don't think I've got enough headroom for the LM317/337 series.
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Old 27th December 2011, 11:18 AM   #3286
AndrewT is offline AndrewT  Scotland
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The minimum Vdrop (drop out) of the 78/79 and the 317/337 are similar.
Maybe you need to look at LDO (Low voltage Drop Output) regulators. But, be careful, they are not as tolerant of component guessing.
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Old 27th December 2011, 12:27 PM   #3287
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I've just shifted the Pumpkin discussion to a new topic - "Pumpkin Problems"
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Old 11th January 2012, 06:10 PM   #3288
TazSC is offline TazSC  United States
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Default Output Caps

Since my Amp already has a Input cap (4.7uf) do I you really need C101,102 if the only function of C101 & C201 is to form a high pass output filter and block DC passing to the next stage ? Any other reason to keep them in the circuit if your amp is ac coupled this for the standard b1 build.
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Old 11th January 2012, 06:54 PM   #3289
AndrewT is offline AndrewT  Scotland
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Where DC exists or can develop during a fault condition and it is required that that DC voltage be blocked from passing to the next stage, then one needs only 1 DC blocker at that link.
The DC blocker can be located at the output of the source equipment
or
at the input to the receiving stage.
One does not need to block the DC twice.

The user needs reassurance that when he/she connects A to B that there is no to little risk of damage.
the easy way for manufacturers is to always fit a DC blocker at the output of all their equipment and for those same manufacturers always to fit a DC blocker at the input of their equipment.

If you the builder decides to take on the design role, then you need to reassure the user/s that you have designed the equipment such that it does not damage it's self.
How do you do that?
I have my solutions.
What are yours?
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Old 26th January 2012, 09:47 PM   #3290
mantha3 is offline mantha3  United States
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1st. I started another thread and should have used this one. This thread is unreal! So much information!

I'm interested in building a B1 Buffer and using the PCB.

I'd build the buffer and not use the source 1 / 2 select. This would be pretty simple with just 2 jumpers in the PCB to force the PCB to only use the input 1.

The volume piece I'm not sure what I'd do to bypass the volume pot/attenuator.

Each channel on the PCB for the Pot/Attenuator has a "CCW", "W" and "CW" to connect to the Pot/Attenuator. I'm guessing a jumper introduced to this area would pass the signal in full. I want a pure buffer without attenuation.

I appreciate any help!!
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