Had a look recently on the links page for DIY audio.
On page 3 of amp projects there was a site Lidstrom Audio who had a schema for a single opamp MM stage.
Usual deal, 100pf and 47 k across non inverting pin.
The inverting using 10R to ground with a 10k feedback loop bypased by 0.33uf in series with a parallel network of 0.1uf and 787R.
Was wondering....
If you only plan on using an MC (Ortofon MC 20 Supreme for instance with about .7mV output)...
Is it an option to drop the input load resistor down to 100R, dispense with the input cap totally and change the 10R to ground to a 2R to boost the gain? Was contemplating use of AD797.
Am I missing some really obvious detail here or is this a workable solution?
Most MC designs seem to be a tack-on solution to match a 100R to a 47K with the extra 10x gain.
If a single chip mm stage can work, would a single chip MC stage be impossible?
I expect that noise and distortion across the really high gain stage will be the killers for this, just seeking some opinions.
In anticipation...
drew
On page 3 of amp projects there was a site Lidstrom Audio who had a schema for a single opamp MM stage.
Usual deal, 100pf and 47 k across non inverting pin.
The inverting using 10R to ground with a 10k feedback loop bypased by 0.33uf in series with a parallel network of 0.1uf and 787R.
Was wondering....
If you only plan on using an MC (Ortofon MC 20 Supreme for instance with about .7mV output)...
Is it an option to drop the input load resistor down to 100R, dispense with the input cap totally and change the 10R to ground to a 2R to boost the gain? Was contemplating use of AD797.
Am I missing some really obvious detail here or is this a workable solution?
Most MC designs seem to be a tack-on solution to match a 100R to a 47K with the extra 10x gain.
If a single chip mm stage can work, would a single chip MC stage be impossible?
I expect that noise and distortion across the really high gain stage will be the killers for this, just seeking some opinions.
In anticipation...
drew