Hello all!
I'm just pondering op amps in small circuits. Say a circuit running 9v or 12v dc. I recently built a LM3915 VU meter for a synth with a TL072 op amp. Is the only way this can be done is with a dual power supply or a conventional power supply(transformer + rectification, etc)? Right now I'm running the op amp off a 9v battery with split rails with a virtual ground and the rest of the circuit off a 12v wall wart. Everything works great.
I understand what a dc load will do to a split rail supply. Does this mean op amps are generally not used in single 9v battery circuits? Or am I just using the wrong op amp.
Ultimately, I'd like to run this whole synth project off a 24v 3amp wall wart, splitting it into +9v, -9v, and +5v(or 4.5v).
And what if I wanted to build a small circuit with just a LM3915 and some small amplification to boost low level audio signals so the LM3915 will work correctly with just a 9v battery.
I'm kinda new to op amps, have worked with TL072, LM386, and LM324.
Thanks for looking.
I'm just pondering op amps in small circuits. Say a circuit running 9v or 12v dc. I recently built a LM3915 VU meter for a synth with a TL072 op amp. Is the only way this can be done is with a dual power supply or a conventional power supply(transformer + rectification, etc)? Right now I'm running the op amp off a 9v battery with split rails with a virtual ground and the rest of the circuit off a 12v wall wart. Everything works great.
I understand what a dc load will do to a split rail supply. Does this mean op amps are generally not used in single 9v battery circuits? Or am I just using the wrong op amp.
Ultimately, I'd like to run this whole synth project off a 24v 3amp wall wart, splitting it into +9v, -9v, and +5v(or 4.5v).
And what if I wanted to build a small circuit with just a LM3915 and some small amplification to boost low level audio signals so the LM3915 will work correctly with just a 9v battery.
I'm kinda new to op amps, have worked with TL072, LM386, and LM324.
Thanks for looking.