How do I check the output of an amp with a scope?
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From: William Sommerwerck on 1 Jul 2010 08:15 > Bunny Ears > Probably the most common method for teaching kids to tie their own shoes > is the "Bunny Ears" method. > Tell the child that he needs to make his shoe laces into "bunny ears." > First, he needs to secure a knot for the bunny's head. Take the laces and > cross them over to make an "X". Then, pull one ear through the bottom of > the "X" and pull tight. > Say, "Now we need to give bunny some ears." Loop the laces into "bunny > ears". > Tell the child that now we need to "make the bunny ears tight so they > don't fall off". Then make another "X" using the "bunny ears", slide one > "ear" under the "X" and pull tightly. I think PETA would object.
From: David Nebenzahl on 1 Jul 2010 13:12 On 7/1/2010 5:15 AM William Sommerwerck spake thus: >> Bunny Ears >> Probably the most common method for teaching kids to tie their own shoes >> is the "Bunny Ears" method. > >> Tell the child that he needs to make his shoe laces into "bunny ears." >> First, he needs to secure a knot for the bunny's head. Take the laces and >> cross them over to make an "X". Then, pull one ear through the bottom of >> the "X" and pull tight. > >> Say, "Now we need to give bunny some ears." Loop the laces into "bunny >> ears". > >> Tell the child that now we need to "make the bunny ears tight so they >> don't fall off". Then make another "X" using the "bunny ears", slide one >> "ear" under the "X" and pull tightly. > > I think PETA would object. But no bunnies were harmed in this metaphorical example ... -- The fashion in killing has an insouciant, flirty style this spring, with the flaunting of well-defined muscle, wrapped in flags. - Comment from an article on Antiwar.com (http://antiwar.com)
From: William Sommerwerck on 1 Jul 2010 13:24 >>> Tell the child that now we need to "make the bunny ears >>> tight so they don't fall off". Then make another "X" using >>> the "bunny ears", slide one "ear" under the "X" and pull >>> tightly. >> I think PETA would object. > But no bunnies were harmed in this metaphorical example ... It's the principle of the thing! "I say unto you, that whoever harms a bunny in his thought, has as much harmed the bunny in its body."
From: Robert Macy on 1 Jul 2010 19:09
On Jun 30, 1:38 pm, "fynnas...(a)yahoo.com" <fynnas...(a)yahoo.com> wrote: > On Jun 30, 8:15 pm, whit3rd <whit...(a)gmail.com> wrote: > > > On Jun 30, 11:38 am, "fynnas...(a)yahoo.com" <fynnas...(a)yahoo.com> > > wrote: > > > > I have built a mic amp and wanted to check the wave form on a > > > scope but when I connect the probes to the o/p of the amp the power > > > supply trips (The Mic operates on 9 volt single rail.) > > > Is one of your scope probes a GROUND connection? Couple to the > > microphone amp output through a coupling transformer, see if that > > helps. > > > Which power supply trips, the scope, or the microphone amp? What > > are the specifications of that power supply? > > Thanks > no the ground connection of the scope is connected directly to the > Amp > Its the power supply connected to the amp that trips or reads about 4 > volts instead of 9v > The current of the PSU was set to 1 Ampere. > Please, generally, how do you check the responds of an audio Amp on > the scope? I mean how the probes are connected. need a good explanation of what is in that power supply or, how about float the power supply, even better, use a battery. then you should be able to connect your scope ground anywhere on the circuit. just make sure your mike, amplifier, and power supply are all floating. Usually one connects the ground of the scope to the system's reference point, also called ground, and connects the input of scope to the output of the amplifier. If the output of the amplifier is an 'H' drive, you will need two input probes, one for each output leg. If you get the amplifier up and running there's a way to use your sound card in your PC to explore what is happening at different frequencies and what the bandwidth of your system is. |