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Old 9th April 2009, 07:11 AM   #3491
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when start to do F5 initial setting (set the bias and dc out) the input got be connected to the gnd or no
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Old 9th April 2009, 10:05 AM   #3492
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Default f5-test leads

sts9fan
I just tagged them underneath at the solder points and left them long enough to reach beyond the board by an inch or two- I will heat shrink the ends after measurement= little prophylactics!
Again I wish to make it clear that Peter's boards are great- just had to figure out how to fit the Tech-DIY parts and the vertical mount seemed best- Peter's suggestion with the big Dales would certainly make sinking Q1&2/Q5&6 much easier while soldering them in place-
rob
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Old 9th April 2009, 10:31 AM   #3493
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hi all
will a bridged f5 still have the same gain as a standard build
or will it be more or less

sheafer
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Old 9th April 2009, 12:48 PM   #3494
AndrewT is offline AndrewT  Scotland
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Hi,
a bridged and/or balanced arrangement with the same gain in each half will apply double the output signal voltage across the load.
That is effectively four times the power into the same load or +6dB. Subject to the usual condition that the amp can only supply +6dB if it has a theoretical zero output impedance and it's PSU similarly has a zero output impedance.
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Old 9th April 2009, 09:44 PM   #3495
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thanks andrew
but just to clarify if the standard f5 is 15db gain will the bridged amp be the same ,eg 15db i know the power output will be more but im confused about the actual gain

regards sheafer
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Old 10th April 2009, 05:15 AM   #3496
stein2 is offline stein2  Serbia
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Quote:
Originally posted by samoloko
when start to do F5 initial setting (set the bias and dc out) the input got be connected to the gnd or no

Of course, input + and gnd (minus in) should be shorted.
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Old 10th April 2009, 06:01 AM   #3497
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thx for reply

It Is not pointed In manual
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Old 10th April 2009, 06:08 AM   #3498
stein2 is offline stein2  Serbia
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Quote:
Originally posted by samoloko
thx for reply

It Is not pointed In manual
I guess it's one of those "common knowledge" things. To get zero output, one must assure there is zero at the input. Otherwise, if anything appear at the input, the amplifier will produce something at the output...
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Old 10th April 2009, 08:08 AM   #3499
cviller is offline cviller  Denmark
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Quote:
Originally posted by stein2


I guess it's one of those "common knowledge" things. To get zero output, one must assure there is zero at the input. Otherwise, if anything appear at the input, the amplifier will produce something at the output...
Actually this description points out a reason why it is a good idea to do the tests without shorting the input - if there is something going on on the output with an open input, you need to fix that problem before connecting speakers.
Remember there is a shunt resistor of 100k on the input, so unless you pick up too much noise, you can assume 0V on the input.
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Old 10th April 2009, 08:32 AM   #3500
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by cviller


Actually this description points out a reason why it is a good idea to do the tests without shorting the input - if there is something going on on the output with an open input, you need to fix that problem before connecting speakers.
Remember there is a shunt resistor of 100k on the input, so unless you pick up too much noise, you can assume 0V on the input.

some amps are sensitive to RF garbage , some not - regardless of input impedance ;

that will be step 2 .

step 1 is always with shorted input
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