u/jackson4213

Hi I recently wanted to get a backup phone while working in China, and Honor has sales on right now.
Magic 8 air looks very impressive to me, given it has smaller size with larger battery than iPhone Air (my current phone). Prizing at 4390 rmb for the 12gb+512gb version, which is quite tempting to me.
Question is will it realistically be better than iPhone air other than its battery life? I do have a second phone but it’s hella slow.

Hi I’m working on making a capacitance gauge or meter, aimed to reflect sub-1pF capacitance change in some way be it through voltage amplitude change or frequency change.

So far I’ve tried many circuits like differentiator, difference amplifier, common-base transistor. Those circuits worked when I tested 1pF change (and could see voltage amplitude changed) but unable to do so with lower capacitance.

I’ve also started looking at methods involving frequency with Colpitts oscillators or LC tanks.
(I did find a yt channel called Designing Hardware who made a nice LC meter that could detect 0.24pF)

I’m finding it hard to break through the limit to get to sub 1pF sensing, and need help in finding a direction. I’m led to believing that analogue circuits are enough alone and will need aid from PLC to do the reading.

Edit: also, is it possible to achieve sub-1pF sensing with just analogue circuits and using no dedicated ic or PLC?

Looking for actual milk-tasting milk. I currently live in China but I cannot find milk that taste good. I lived in New Zealand and I’ve grown used to just having a glass of cold milk or chocolate shake but nothing I found is remotely close to the milk I know of.
Soy milk is fine and it’s my go to in the morning, but somehow other countries have normal tasting milk aside from China.

I need help building a signal generator for a project that can output 60MHz at 30Vpp to 40Vpp. This is to drive a capacitor gauge with a series resistor to see the voltage change in the resistor.

I tried to do a class a common-collector transistor amplifier with a 60mhz crystal oscillator input but didn’t work. Simulated a common-base amplifier and didn’t work. (Transistor using 2n3866a)