Новини світу мікро- та наноелектроніки

i did combine 2 pcbs into one stencil but im not falling for this jlc

theyre probably gonna charge me extra or something

Today, I had an issue where I checkled under the sink and noticed that the waste disposal had a very slow leak.
After tightening the seal, I decided to implement a home made moisture sensor and warning system.
It essetially detects water by passing electricity throught the water to the gate of a mosfet, and then using that mosfet to pull current through a dedicated LED flashing chip.
A small test button is included, to test the battery works, though I do not anticipate the batteries draining very quickly.
As such, only zinc cells were implemented.

This has given me a good chance to put the dedicated LED flasher chip to good use.
After checking online, I think it's been discontinued.
I initially wanted to use a high brightness 5mm transparent red LED, but it wouldn't fit into place, so decided on a 3mm LED instead.

The LED can be changed by inserting it into the female wire ends.

As for the sensor itself, just a small square of stripboard with interleaved probe terminals.
Simple, but gets the job done.

All installed with tape and hot glue gun, for fast removal, if needed.
All mounted on a small peirce of card, for a quick and dirty job.

This is my first post documenting my transistor binary clock project. The goal is, to only use through hole transistors, diodes and passive components to form RTL or DTL logic. These logic elements should then divide the 50Hz mains into minutes and hours.

For this job, I designed T flip-flops, that can be reset. This would allow me to combine multiple T flip-flops and some logic, to count to any arbitrary number. The clock should then display this number using a few LEDs.

Today I achieved the first Milestone of this project, by soldering up the first PCB design and testing it. To my surprise, this design worked immediately! Now I am very happy with this first Layout :3

If I am done with this and I have documented everything, I am planning to open source the board and other files. No one would probably want to build a massive discrete transistor binary clock, that constantly draws 8 Watts, but whatever.

Now I can say: One PCB complete, 21 more to go...