No opamps in this baby. The DIP chip is the power supply. It takes the filtered and regulated (TO-220-5) input dc voltage and performs both a doubling and inversion, thereby creating +8V and -4V rails. For the discrete differential transistor stages to work with a grounded input and output signal, the negative supply is necessary. I use it for constant current sinks to load both the differential and output follower stages.
Both supply rails get very heavy duty passive filtering, eventually dropping to about +7V and -3V after resistive losses.
jh
