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Other Parts Discussed in Thread: LMH730123 , OPA1652 , OPA1642 , TIPD186 , OPA2171 , LM324 , LM358 The schematic is that of appendix A (page 32) of TIPD186 - more precisely the input gain stage (U1A). This circuit has been built on a LMH730123 board (P1 replaced…