The voltage across the potentiometer terminals can be from -5 V to +5 V, but the maximum current can only be 4.4 mA so it’s only intended to be used where it’s not going to see a heavy load. A small AC signal could be applied within that voltage and current.
I remember making the original stepped tone generator from the engineers mini notebook series back in the early days. I found another Arduino sound generator that I’m going to try soon and maybe do a video about. One day I will put a bunch of things together but first I need to clean up my work area because it’s so crowded I can’t even do mail bag right now.
I am making a two channel tone generator controlled by an i2c digital potentiometer. Instead of 555 I use 556. Output is handled in summing Op-amp. I'm still not sure how to mute the sound. How did you do that?
@@GadgetReboot PCF8574 + 4066 is a pretty good idea. I wish I had known. I ordered the DS1803 but I might still consider your way unless I find a 4066 style i2c-ic. Or I put another DS1803 to adjust the volume. If it can be set completely silent of course. Have to subscribe, thx.
@@Redfizh I might have to get some DS1803's to try out. I see they can handle 1mA and the wiper may add 400 ohms to 1K of resistance so that would need to be factored into any usage, but that may be a feature with a 555 where there should be a minimum resistance to get oscillations and we may not have to add an extra series resistor. And a larger 100K pot would make the wiper resistance more negligible. If using as a volume control with one side to ground, the ground side should probably be the terminal that is connected to the wiper on power up so the volume isn't on full.
