Also the roll that’s unspooled is actually smaller

Nice! It makes me feel so much better, if the error that gets me killed is not human error

Jamming radio is pretty basic, and then the drones are useless. Unless the operator is close enough so the drone can be controlled by a cable, or visual signals

If you drop them all the way from the top of the stack, this is what happens

Du meinst, das ist der stark verlängerte Arm der Mathematiklobby.

Das ist natürlich unzumutbar! (Im Gegensatz zu Parkinson)

You can become one too! Get your certification here https://mt.cert.ccc.de/

The mixer step seems unnecessary at this stage, other than that, checks out

This whole circuit is cursed… it looks like for Q19 to be on, the base/collector junction of Q18 must be forward biased - is that even allowed? Does that make the collector a fourth emitter? Or is the whole circuit just made to convey to the reader of the datasheet that they could never ever build this themselves?

There’s just one collector though?

Chewing on cables

If you’re lucky, one of the shards will block the hole at the bottom of 4

Wo ist denn dieser kostenlose Obstkorb? Im Supermarkt wollen die immer Geld für die Orangen seltsamerwrise…

Great, good luck with that :)

Another thing that comes to mind: for audio purposes another technique used in ring modulators for audio effects is to use a mosfet switch to mix the signal with a square wave. This has more byproducts than mixing with a pure sine, but is a lot easier to do. Since you are downconcerting, it should not matter at all if you use a square wave, since the byproducts will all be (higher-order) harmonics of the local oscillator, which you’ll filter out anyway.

I’m not sure I understand what you are trying to do… do you want to build a radio? Or are all your signals in the audio range?

Anyway:

• w2aew has some great videos on diode ring mixers, like this one about winding the transformers: https://www.youtube.com/watch?v=a8ViWS61hsU
• You can also get ready-made diode ring mixers (including transformer and everything) like this one: https://www.minicircuits.com/pdfs/SRA-1W+.pdf

Regarding Gilbert cells, the two popular chips are MC1496 and SA631. The 631 comes with a built-in oscillator, so it’s quite handy. Unfortunately both are hard to come by these days.

🗡️💪

Growing plants with LEDs certainly works, I’m just wondering if the power of a USB port is enough

there’s no need for relays if you have low voltage

That’s a good point. Also makes me wonder if those lights will actually make a difference when it comes to plant growth, given the low power.

It’s not completely stupid. One pissible issue: when the light level is around the threshold, slight variations (think: cloud passing by) will cause the relay to switch back and forth quickly. This can be solved with some additional parts (keyword: hysteresis).

I would recommend using a microcontroller, it makes this problem easy to solve, plus you can have more logic to trigger the lights (eg time based).

Another thing is turning off: if it’s purely based on light level, you need to make sure the sensor does not “see” any of the LED light, otherwise it thinks the sun is back up

The only winning move is to cook a nice curry, because plain rice is just boring.