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In Reply to: RE: "homemade dual opamps." posted by AbeCollins on December 21, 2016 at 23:18:05:
That would require a couple billion dollar investment in a semiconductor fab.and so, by definition, wouldn't be home made. I at least took fmak's "homemade" to mean "homebrew" (aka "tweaked") esp after he described the circuit.
Whatever, configuring op-amps so they don't need an output cap is definitely not new. For many years, I used an I/V circuit discussed by Audio Synthesis in HiFi News way back in 1987. It used a voltage reference chip to adjust the -IN of an AD42 op amp and thereby cancel DC offset on its output. IIRC, similar circuits were discussed by Walt Jung and others.
The device did me for ~25 years until I replaced it with a Lampizator SRPP circuit that sounds much better even though the tubes it uses are even older than the AD42 and definitely need output caps. (The TDA1541A chip that has happily driven both devices is now 30-odd years old but is soon to be reconfigured to use "simultaneous" mode courtesy of a spanking new USB board from Audial. Or so I hope.)
D
Edits: 12/22/16
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Follow Ups
- Please - not another AC/fmak playground spat. PLEASE. - Ryelands 04:24:15 12/22/16 (2)
- That would require a couple billion dollar investment in a semiconductor fab. - fmak 04:49:23 12/22/16 (1)
- Fmak is BACK!!! - Ivan303 07:33:32 12/22/16 (0)
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