Re: Re: Re: Re: Bugle!
At the output of first amp, there is an arrow and a constant current (2 mA) symbol.
The constant current diode was placed there,
to the negative supply. Makes the OP run in Class A.
Nicke schematic
I think it is a modified version of Linear Tech'
application for LT1115 + LT1010.
see LT1115 datasheet
Have a look at this schematic.Optical said:
At the output of first amp, there is an arrow and a constant current (2 mA) symbol.
The constant current diode was placed there,
to the negative supply. Makes the OP run in Class A.
Nicke schematic
I think it is a modified version of Linear Tech'
application for LT1115 + LT1010.
see LT1115 datasheet
Re: Re: Re: Re: Bugle!
This part isn't really a diode. It's a FET with a buitl-in source resistor and the gate in connected to the other end of the resistor. This forms a classic current source made of a FET. This current source is connect between the output and the negative rial = the outstage goes in class A more than it would.
Check here but if you will see it more clearly look here.
Optical said:
This part isn't really a diode. It's a FET with a buitl-in source resistor and the gate in connected to the other end of the resistor. This forms a classic current source made of a FET. This current source is connect between the output and the negative rial = the outstage goes in class A more than it would.
Check here but if you will see it more clearly look here.
peranders said:
I have tried it with AD797 and LM6172 and that is the reason I used it with the OPA637.I would always use a constant current source with an opamp,it is worth it IMHO.
By the way,I can recommend my phono stage.It sounds really good,I have no problem with noise despite the "high"(compared with a AD797 or LT 1115) noise of the OPA637.
Nicke
riaa
Here is a simple french design but it sounds really great with a DL103... and better caps, better it will sound.
Here is a simple french design but it sounds really great with a DL103... and better caps, better it will sound.
An externally hosted image should be here but it was not working when we last tested it.
Re: Re: Bugle!
Mostly true, but...
The NE5534 has fet's at the inputs. See:
http://www.semiconductors.philips.com/acrobat/datasheets/NE_SA_SE5534_A_2.pdf
If you choose to keep the resistor values in the feedback as low as sugested in the quote above the value at the noniverting input can be propotionally lower.
If you decrease the resistor values with a factor 100 I suggest you either put in a lot more batteries or put in a good quality powersource. I expect the lifetime of the batteries to be decreased with a factor 100 as well.
By the way the schema of the bugle seems pretty simple an can be built cheaply. (NE5534 costs 1,50 Euro, better opamps mentioned in this thread cost much much more)How can equipment that's according to you be sold for such high prices?
Peranders, do you hav the schema of a Nad PP1 and MTech?
peranders said:
Mostly true, but...
The NE5534 has fet's at the inputs. See:
http://www.semiconductors.philips.com/acrobat/datasheets/NE_SA_SE5534_A_2.pdf
If you choose to keep the resistor values in the feedback as low as sugested in the quote above the value at the noniverting input can be propotionally lower.
If you decrease the resistor values with a factor 100 I suggest you either put in a lot more batteries or put in a good quality powersource. I expect the lifetime of the batteries to be decreased with a factor 100 as well.
By the way the schema of the bugle seems pretty simple an can be built cheaply. (NE5534 costs 1,50 Euro, better opamps mentioned in this thread cost much much more)How can equipment that's according to you be sold for such high prices?
Peranders, do you hav the schema of a Nad PP1 and MTech?
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