hey boys and girls, I have a small Christmas nut to you all ), I play alitle with a new cad program and the results you see below .. and now the big question will this work and play nice sound .. or shell I only to give up and grab a beer
An externally hosted image should be here but it was not working when we last tested it.
is it a BPA200 with inverting amplifiers?
Where are all the other components?
What values are R1, R2, R3 & R4?
How does the DC offset vary with temperature?
What happens to the amps when DC offset is not zero.
R1,R2,R3 & R4 i guess will be 10k
R9,R10,R11, & R12 is 221
R5,R6,R7 & R8 is 0.1
i plan to use opa541 chips, and i dont have a clue what will happen when det offset is not zero ..
you guess wrong.R1,R2,R3 & R4 i guess will be 10k
If R1 =10k and R12=221r then gain is 221/10000 =0.0221 ~-33dB
Since you have a bridged load, the effective gain at the load is -27dB.
Swap these around and the gain becomes 10000/221 =45.2 ~+33dB and across the load +39dB. This is very high.
Swapping the resistor values causes an input impedance problem. The XLR sees an Rin=110R. What can drive 110r?
Matthew Cattle's Website This is allmost the same drawing that i have with the same resistors values
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