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Old 28th December 2006, 04:26 PM   #1
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Default Is this circuit acceptable for this forums use?

Please advise, I found it surfing the net. Thanks
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Old 28th December 2006, 05:08 PM   #2
anatech is offline anatech  Canada
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Hi ppcblaster,
Be nice if it had an output buffer of some kind. Simple and inexpensive. It probably sounds okay. You could just add another NE5532 to handle both channels after the volume control.

Think about a thump eliminator for turning it on and off. Better power supply really wouldn't hurt either.

-Chris
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Old 28th December 2006, 05:50 PM   #3
phn is offline phn  Sweden
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Better PSU, indeed.

Personally I would place the tone control before the circuit. It might not make a difference, but I like it that way.

Chris knows more about buffers than I. But wouldn't a high-pass network be in place (after the volume pot has been moved)? I'm not much for caps in the signal path. I'm not much for tone controls either, so it evens things out. (I do like tone controls, in a sense. But since it takes effort to use a Pultec-type tone control properly, I think it's better to just drop the thing.)
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Old 28th December 2006, 06:36 PM   #4
anatech is offline anatech  Canada
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Hi phn,
LOL!

You crack me up sometimes! Love your avatar!

-Chris
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Old 28th December 2006, 08:23 PM   #5
phn is offline phn  Sweden
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Quote:
Originally posted by anatech
Hi phn,
LOL!

You crack me up sometimes! Love your avatar!

-Chris
I enjoy cracking people up sometimes.

Maybe an explanation is in place. I don't think tone controls are inherently bad as many people do. But if I'm to have one I want one of those swank Pultec thingies used in pro audio. The problem is that you have to tweak the settings for every album you play. Who the you-know-what has the time and energy to do that?

I just don't know what a buffer would do in this case. But that's not uncommon. This electronics crack me up more often than not. My skull, that is.
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Old 28th December 2006, 08:37 PM   #6
anatech is offline anatech  Canada
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Hi phn,
I don't mind tone controls, although I seldom use them. On occasion they are useful. Just don't make them part of the feedback network for the power amplifier!

In this case, a buffer would go between the volume control wiper and the outside world. If your amp circuit is but a few inches away in the same box you may not need it. There are some amp circuits that need a low impedance in to be driven with low distortion.

If you intend on squirting your signal down a cable, you really ought to have a buffer in there. It helps to maintain a low signal to noise ratio and avoid other effects and interactions.

-Chris
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Old 28th December 2006, 09:34 PM   #7
phn is offline phn  Sweden
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I'm with you on the buffer and impedance. But wouldn't moving the volume pot and adding, say, a 2.2uF coupling cap and a 100k grounded resistor take care of it?

As a side note, I don't like the idea of coupling caps. I even started a coupling cap thread. I still don't fully understand its purpose. And I definitely do not like the idea of a cap in the signal path. But in the overall scheme of things, it's probably not that bad.

Edit: DOH! In my first post I wrote "Personally I would place the tone control before the circuit." I mean VOLUME pot. Now it should make sense.
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Old 28th December 2006, 09:43 PM   #8
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Default Thanks but I have lost parts of my hearing

I am treble deaf, along with almost no hearing in my left ear.

If I boost the treble I can enjoy what I am hearing, otherwise it

is muffled.

Also where can I post a request for a Rev C amp addon?

"The optical digital out is a digital output on the back of your tv

is toslink"

I don't have the skills to build a digital "toslink" input from my TV

to an Amp I want to build.

Any help would be greately appreciated. Thank You...Gary
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Old 28th December 2006, 09:56 PM   #9
anatech is offline anatech  Canada
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Hi phn,
The problem with putting the volume control first is noise. Having it last means that any noise is attenuated along with the signal. I'm thinking a buffer with a gain of 0 dB, or close to it.

Hi Gary,
I don't follow your request, but you've asked for it here and it's your thread.

-Chris
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Old 28th December 2006, 11:17 PM   #10
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Default Thanks

I will search, and if I find nothing, I'll start a new thread.

Thank you again
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