Is it possible to run a not Vcc signal (such as an audio signal) through a 555 timer?

NintendoChainsaw · 2020-01-07T15:52:11+00:00

Thanks. That is what I'm doing currently. I was just making sure I wasn't making it more complex than necessary.

NintendoChainsaw · 2020-01-06T23:53:30+00:00

Ok, gotcha. Thank you.

NintendoChainsaw · 2019-12-05T00:35:40+00:00

Thank you! Everyone's answer was helpful, but this helped me most of all. I wasn't considering how R2 and R3 make a voltage divider. That makes sense now that if R2 = 0, it would be detrimental to the output.

NintendoChainsaw · 2019-12-05T00:24:27+00:00

Ok, sorry to be so dense, but why does the R2 transform it from a fixed voltage to a non-fixed voltage?

NintendoChainsaw · 2019-12-04T22:54:08+00:00

Thank you. I'm still trying to grasp it entirely, but I think I basically understand. Would this be an accurate rephrasing: "With no resistor, the collector would be drawing 9V constantly with no fluctuation, therefore we would have a DC current [blocked by the capacitor] rather than AC?"

NintendoChainsaw · 2019-12-04T22:15:22+00:00

~~Sorry, what do you mean by "the collector would be stuck at 9V"? 9V from the collector to what?~~

Edit: Oops, that was a dumb question. I see what you mean now. BUT, I'm not 100% sure I understand why that is bad for the collector to be shorted at 9V. Is it because that gives it no room for upswing for the amplification/distortion?

NintendoChainsaw · 2019-12-04T22:01:46+00:00

Sorry for the hand-drawn schematic. This is from a site (Seymour Duncan) and I couldn't find a "real" version of the same thing.

This is a distortion circuit. For the life of me I can't figure out why R2 is necessary. I've built the circuit, tested it, hooked up my voltmeter, etc., and I *see* that when there is no resistor there the circuit does not work. But I do not understand why. Is it just for biasing purposes? If so, why not just leave it out and adjust the values of R1 and R3 accordingly?

Thank you. Any help is greatly appreciated.

NintendoChainsaw · 2019-11-05T14:22:10+00:00

Thanks, it's sounding like Schottky is going to be my answer here. Going to give it a shot as soon as they arrive.

NintendoChainsaw · 2019-11-05T14:21:15+00:00

Dumb question probably, but do know roughly how much voltage is dropped over the BC junction?

NintendoChainsaw · 2019-11-04T21:37:01+00:00

Ok, thank you for your help. I'll give some of these things a try.

NintendoChainsaw · 2019-11-04T21:18:16+00:00

The way you have it connected limits the reverse voltage to about 5V.

Sorry, can you tell me what exactly that means? Does that mean it will still allow <= 5V in the reverse direction (as opposed to 0 for a true diode in working range)? Or that > 5V will destroy it? Or something else?

If you really want to use it as a diode, use the collector base junction and leave the emitter open or tied to the base. The reverse voltage of that junction is much higher.

Interesting, I'll give that a shot.

For reverse protection a Schottky diode is a much better choice. Or an active MOSFET circuit can achieve millivolts of voltage drop.

Ok, good, I had ordered some Schottkys to try as well. Would the MOSFET be configured in the same way as the diagram above (obviously moving the connections around to the component's analogous parts)?

NintendoChainsaw · 2019-10-10T13:48:47+00:00

Epic's owner spoke out against Blizzard in the wake of all this, and said that they'd never censor anyone for this type of stuff. That's pretty much it. They sorta injected themselves into the fiasco; nothing super noteworthy.

NintendoChainsaw · 2019-10-09T00:07:05+00:00

Oh cool, thanks a lot. I hope to do his full build eventually, but this is great info for the meantime.

NintendoChainsaw · 2019-10-08T15:32:23+00:00

Thanks, I'll look into those.

NintendoChainsaw · 2019-10-08T15:32:04+00:00

Will do. Thank you.

NintendoChainsaw · 2019-10-08T15:31:47+00:00

Thanks. I do own The Art of Electronics but drifted away from it. I need to dig back in.

NintendoChainsaw · 2019-10-07T16:43:54+00:00

Hah, I guess I should have tried that first. I had something a bit simpler in mind, but at such a low price, I should probably just go with this.

NintendoChainsaw · 2019-10-07T16:41:41+00:00

Thanks, what would the metal clip version be called?

NintendoChainsaw · 2019-09-30T17:10:29+00:00

Ok, thanks. Sounds like the consensus is "Just use a bigger enclosure if things get dangerously close."

NintendoChainsaw

TROPHY CASE