Pro Audio Design Forum

Excellent.

I presume this speed control has perfect efficiency, no heat from the caps.

3 caps, 2 switches.
I guess you obtain the 3 cap values by shorting some cap(s). Is that ok for a swich when shorting a charged cap ?

I presume the noise, using a cheap dimmer is because of power is far from sine, made with a triac with delayed conduction. A PWM technique is prone to make such trouble, too. I have seen a two speed ceiling fan where a capacitor is inserted to give the slow speed. This is not continuous as you wish ...

These days a low impedance aluminum (developed for switching PS apps) would be a sensible replacement. I like to hear this. Tantalum was said to be unique with some best unbeatable characteristics. A bad point since Ta ore is mostly under control of African maffias and chinese grab on such high tec...

Another option is snare wires.
Set four small loops a foot apart on a twig.
Set the twig at a place they will like to use as a bridge. Bait with jelly.

Tree rats are pretty smart.
https://youtu.be/hFZFjoX2cGg

Sure, i know they escape jumping from trees to trees.
I had a dog, who never figured that out. The dog liked to run at a squirrel, that used to climb up a tree.
Then the dog was barking and waiting at this tree, for ages, not aware the squirrel was gone several trees away.

From a search, about how to keep squirrels away.

Add metal tree collars to keep the squirrels out of your trees. Cut a thin piece of sheet metal with metal snips. Make it big enough to go around the tree and 3 feet (0.91 m) wide. Wrap it around the tree 6 feet (1.8 m) off the ground.

Yes, the article explains.

R is a scale factor, as I presumed. The author says about 100 Ohm.

area is emitter area
Transistors have different emitter areas
to achieve temperature compensation. To understand this, seems to need firstly to understand what they call "band gap".

I understand the bottle contains pure product and the mix with high pressure water at some ratio is done near the bottle thanks to calibrated jets. Right ? This is tricky hydrodynamics that makes me think of an injector. Actually, I do not well understand, please give me a user manual with detailed ...

What are these area=2, what does it means in terms of BJT characteristics ?
What are these {1.8* R } I suspect R is a parameter, what is it's typical value ?