Stupid question about boosted op-amp circuit

[artilect99]

Hi all,
what would be the effect of running the below circuit at 12V instead of the 15V specified?

I ask because I'm already running it at 12V (sharing psu with some eurorack modules) and I'm not sure what effect (if any) this is having -- I'm trying to decide if it's worth the trouble to run this off it's own 15V supply.





Boosted current drive setup for driving an 8 ohm input transducer spring tank. Required current is estimated at 28ma RMS / 40ma peak.

According to Rod Elliot, "The Figure 5 circuit is capable of driving an 8 ohm coil to several times the maximum rated current at any frequency. The values shown above will all provide slightly more than the manufacturer suggested transducer drive current with an input voltage of about 1.5V RMS."

[Grumble]

Since you have a lot of overhead in both voltage and power, I see no problems in powering this amplifier with pos and neg 12 volt.

[artilect99]

Yeah I think you're right. I simulated the circuit in falstad and the current output stayed the same at 15V and 12V, so I'm guessing there is no meaningful difference in this application (other than working a tiny bit harder to produce the require current).