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26th December 2009, 05:55 PM
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#1 |
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diyAudio Member
Join Date: Nov 2003
Location: bodø
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symmetrisk gain clone
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
 
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26th December 2009, 06:51 PM
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#2 |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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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.
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regards Andrew T. |
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26th December 2009, 07:02 PM
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#3 | |
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diyAudio Member
Join Date: Nov 2003
Location: bodø
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Quote:
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 ..
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26th December 2009, 07:11 PM
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#4 | |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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Quote:
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?
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regards Andrew T. |
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26th December 2009, 07:29 PM
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#5 |
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diyAudio Member
Join Date: Nov 2003
Location: bodø
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okidoki, well i dont have a clue what Im doing
but i joined this forum to learn and for fun .. this is my verry first circuit i have drawn inspirert av varius deisigns i have seen here in the forum ..so Im happy for all the help i can get
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26th December 2009, 07:35 PM
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#6 |
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diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
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download the opa datasheet.
read it front to back twice. Come back with questions. Forget about a BPA in the meantime. Settle for a single channel non-inverting amp based on the opa instructions.
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regards Andrew T. |
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26th December 2009, 08:35 PM
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#7 |
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diyAudio Member
Join Date: Nov 2003
Location: bodø
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Matthew Cattle's Website This is allmost the same drawing that i have with the same resistors values
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