The basis of my question is that i'm not getting enough volume from a BA4560 op-amp. It's running from the clicks of a 555's output and out to an 8ohm .5W speaker.
Several audio circuits i've built use the warm sounding BA4558 (without the '-1' as I believe that signifies later ones, where the internal structure was changed and they sound a little gritty). In the past i've used this chip from salvaged boards many times and run the output to headphones. One circuit for 8-bit sound sample playback used a 386 as audio amplifier and that was nice and loud, from an 8ohm .25W speaker. Unfortunately I have no more 386's, but did have a Rohm BA4560 for this project.
The project is a metronome. My wife happily uses it for her piano playing but said she'd like a bit more volume.
Following a 741's amplification circuit here: http://talkingelectronics.com/projects/OP-AMP/OP-AMP-1.html near the bottom of the page, I altered the BA4560 stage last night to incorporate the voltage divider and gain. The result was a volume exactly the same ! The components however did work, as tweaking values etc resulted in different tones from the speaker, or less volume.
My deduction from these trials, is that the BA4560 is outputting at full volume already, from the tiny 555 click sound ?
Several audio circuits i've built use the warm sounding BA4558 (without the '-1' as I believe that signifies later ones, where the internal structure was changed and they sound a little gritty). In the past i've used this chip from salvaged boards many times and run the output to headphones. One circuit for 8-bit sound sample playback used a 386 as audio amplifier and that was nice and loud, from an 8ohm .25W speaker. Unfortunately I have no more 386's, but did have a Rohm BA4560 for this project.
The project is a metronome. My wife happily uses it for her piano playing but said she'd like a bit more volume.
Following a 741's amplification circuit here: http://talkingelectronics.com/projects/OP-AMP/OP-AMP-1.html near the bottom of the page, I altered the BA4560 stage last night to incorporate the voltage divider and gain. The result was a volume exactly the same ! The components however did work, as tweaking values etc resulted in different tones from the speaker, or less volume.
My deduction from these trials, is that the BA4560 is outputting at full volume already, from the tiny 555 click sound ?