Reddit:Electronics

If there's interest I'll post more.

https://preview.redd.it/37pzjodu1uee1.png?width=667&format=png&auto=webp&s=b857e9367e4bed1ab1bde3e166b238d67f0ee14e

Source: Single supply opamp design techniques

https://preview.redd.it/mnyawhbh9ree1.png?width=871&format=png&auto=webp&s=d688ac5303303a2a568bda89e81a15d85403ae9a

https://preview.redd.it/h7i0ilih9ree1.png?width=820&format=png&auto=webp&s=d45444dc244e22fa98adb821c132c176ad199434

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This is a Nixie tube clock I built without using any PCB boards. Basically, it was built via point to point wiring. This thing is far from perfect: it’s all crooked, numbers don’t line up, etc. but I think that’s the allure of building something like this. This will never be perfect. Something like this cannot be built by automation. No 2 clocks will never be identical; if I decided to build another clock like this, I will never build it exactly like this one.

This thing is still not perfect; it is failing the self test routine and need to still debug the driver circuits of one of the nixies. It’s almost there though!

I’m planning to give my grandfather the ugly nixie clock. It’s something very personal I built with my own hands. He’s in Hawaii, so I’m an ocean away from him. I wish I could visit him every day, but that would be a long daily commute (from California to O’ahu). He doesn’t have much time left on this planet, however, he was the very one that molded me into what I am today. He’s going to get a nixie clock, only one of it’s type in the entire world lol

This build was pretty stressful and frustrating, but I absolutely loved every minute of it.

I wanna start by saying: I literally just started this hobby today.

I know this is an egregiously simple thing and nothing impressive, but holy crap this brought me unbelievable levels of dopamine!

I have to say this is one of the coolest things I've done in a long time.

Being able to solve some equations and then build this little circuit, and watch the EXACT calculations i came up with pop up on the multimeter is amazing

I've done lots of math in my day, but MAN, being able to calculate something on paper then see those results in the real world is simply amazing

My first isolated power supply!!

It does 200mA fused, +-9V. The actual max current is a mystery due to the salvaged transformer (from a device that is at around 3 times as old as me), so I took a relatively conservative guess. t's fully linear, with less than 1mV PARD at full load (using a very janky test setup though).

I have a higher power (1.25-18V, 0-3A) power supply made of a buck regulator module with a laptop power supply, but it not isolated, and the ripple is horrible.

I only made this so that I could test parts of my next power supply, which will be a more legit, 0-20V, 0-2A lab power supply.

I'm going to box it up later, but for now it does work.

Using an Arduino to control some stepper motors and servos.

Found this disassembled smoking device in the car of a friend of mine. The battery itself even has a cross shaped vent on top of it.

Yep not the best measurement whise but for my audio application it sounds pretty decent. And it’s one of the prettiest heaters there is for ECC88/6N1P