Please forgive me my ignorance and YES I´ve searched and YES Google is my friend as well but I found nothing conclusive at all ... 🙄
What is the right schema for a preamplifier: Input to Buffer, then into potentiometer and then into gainstage?
If not: What is right and why?
THX!
What is the right schema for a preamplifier: Input to Buffer, then into potentiometer and then into gainstage?
If not: What is right and why?
THX!
SmellOfPoo said:
There is no "right schema".
At least 95% of all preamps have an unbuffered pot at input, followed by a gain stage. Some have a pot sandwiched between gain stages, while others have the pot at output.
It is as analog_sa said.
Also, if you do not need gain, then you can try:
input > attenuator (or pot) > unity gain buffer > output
Also, if you do not need gain, then you can try:
input > attenuator (or pot) > unity gain buffer > output
Hi,
all the options will work.
If no gain is needed then :-
input > pot > buffer > output
with gain:-
input > pot > gain > output
The advantage of a pot at the input is avoiding input overload. Active stages before the attenuator receive full signal and the attenuator cannot reduce the signal level in the preceding active stages.
If you need high gain for any particular input then usually splitting the gain among two or three stages is better.
Better still is to pre-amplify the lowest level signals at source and send a higher signal level to the pre-amp. But ensure this pre-pre cannot overload on worst case signal and/or transient spike.
all the options will work.
If no gain is needed then :-
input > pot > buffer > output
with gain:-
input > pot > gain > output
The advantage of a pot at the input is avoiding input overload. Active stages before the attenuator receive full signal and the attenuator cannot reduce the signal level in the preceding active stages.
If you need high gain for any particular input then usually splitting the gain among two or three stages is better.
Better still is to pre-amplify the lowest level signals at source and send a higher signal level to the pre-amp. But ensure this pre-pre cannot overload on worst case signal and/or transient spike.
Ehm ... What you think about this: http://sound.westhost.com/project88.htm
Simple enough, worth to give it a try?
Simple enough, worth to give it a try?
Yes, it is a reasonable starting point.
Give it a go, and use this power supply...
http://sound.westhost.com/project05.htm
Give it a go, and use this power supply...
http://sound.westhost.com/project05.htm
Also my option if you do not need gain:
input > attenuator > unity gain buffer > output
But keep that in mind....any design you accept,a really good power supply is a MUST.
input > attenuator > unity gain buffer > output
But keep that in mind....any design you accept,a really good power supply is a MUST.
SmellOfPoo said:
There may be. However I recommend that you start with the simple system. Please also note that some of the biggest differences are likely to come from the way you wire the ground of the system. So in case you have not seen these, have a read...
http://www.gbaudio.co.uk/data/ground.htm
Ground loops
http://www.tcaas.btinternet.co.uk/jlhearthing.htm
Grounding
http://sound.westhost.com/earthing.htm
Grounding
http://www.dself.dsl.pipex.com/ampi.../balanced.htm#7
Balancing and grounding
http://rane.com/note151.html
Grounding and shielding from Rane
http://rane.com/note110.html
Interconnection from Rane
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