Reddit:Electronics

Wanted to share my experience with getting multicolour PCBs fabricated and the results. To try is out I just made e a simple badge..

The image was created in Inkscape and exported as a ping..

Then just sent the png along with the Gerber's for fabrication.

The results are excellent!!

https://github.com/TannerNelson16/sprinkler_controller

Not sure if this belongs here, but this was originally mostly a software project that's morphed into a little bigger project. It's currently open source, but I may look into selling complete units in the future. Currently designing the enclosure for this unit.

Features:

• MQTT compatibility (Works with Home Assistant)
• Micropython on ESP32 controller
• Web Server (Configurable via IP Address)
• Maintains Operation Regardless of maintained connections. Will broadcast an Access Point if necessary
• 24VAC input with Custom Voltage Regulator and input capacitors to mitigate ripple from the full wave rectifier
• LED power Indicators

https://preview.redd.it/yr0xq0jdqdvd1.jpg?width=4032&format=pjpg&auto=webp&s=0decb64ef085baee13b635ccc5ed2d1cf6fbe0f2

(I still have to install the remaining LED indicators and the other resistor network if you're confused by the image. Just wanted to get everything tested.)

Made some mistakes in the design, but got them sorted and now I’m very happy with the final results!

Its using ECC83/12AX7A/5751WA Tubes which require 6.3V at 0.6A for heating. This Op-Amp requires +300V and -300V on its rails and has an output voltage swing of +50V to -50V. Its input offset voltage is 2.4V for it to detect a difference.

Here its wired up as an inverting amplifier with a gain of 10. Both probe leads are x10 probes, top channel is the output (5V/div -> 50V/div) and the bottom is the input (0.5V/div -> 5V/div) So I get a gain of 10 and it inverts, just as expected.

Photo 1 (from top to bottom) 1. Synchronometer Ch7-15 (Ч7-15). Used as reference clock source for all other devices that have option of external reference clock, as normal clock and other stuff as needed. 2. Programmable frequency synthesizer G4-164 (Г4-164) 0.1 - 640 MHz; AM, FM, PCM; high stability (1 * 10-11 Allan deviation). 3. Frequency counter Ch3-54 (Ч3-54) with time intervals module installed

Photo 2 (from top to bottom) 1. Programmable frequency counter RCh3-07-0001 (РЧ3-07-0001). Probably the rarest and most unique device in my collection. See my other post for more photos and description. 2. Low frequency high power generator G3-123 (Г3-123) 1 Hz - 300 kHz Max output power of 90 W.

Photo 3 (left to right, top to bottom) 1. RMS voltmeter V3-56 (В3-56) Up to 15 MHz. 2. Tube portable multimeter V7-15 (В7-15). The oldest device in my collection. Has the unique ability to measure voltages up to 100 V in GHz range. 3. Wide band generator G4-154 (Г4-154) 7 Hz - 10 MHz; Max output power 10 W.

Photo 4 (top to bottom) 1. Portable oscilloscope S1-73 (С1-73) 10 MHz, has detachable 24 V power supply, light and compact (for analog scope). 2. RLC meter E7-15 (Е7-15). Light and compact, has 4 wire measurement scheme and high range.

Photo 5 (top to bottom) 1. Power supply B5-31 (Б5-31). Semi linear, 0 - 100 V, 0.1 A 2. Power supply TES-88-2.5 (ТЕС-88-2.5). Linear. 0 - 35 V, 2.5 A 3. Power supply B5-50 (Б5-50). PWM, 0 - 300 V, 0.3 A

Photo 6 1. Lab clock Ch7-3 (Ч7-3). Mainly used as counter or stopwatch.

Before you all come attack me, I'm just a highschool student trying something out. Over the past summer, I've been working hard to develop a weather station with the MQ135, MQ7, MQ2, MQ4, BME680, SIM800C, ESP32C3 and LIS3MDLTR (magnetometer). Entirely powered by solar power and with a 2500mAh battery, and a OLED display as a gimmick. A lot to process, I know. I've made a prototype (not fully working) and it seems like a good concept. Planning to use InfluxDB for sending the data with SIM to a server and then graphing it with another software (somehow). All I wanted to know is if it seems as if it seems like a valuable product which other people would purchase, especially for industrial applications, or am I just throwing money into a fire? If you have any questions on this, then please let me know below, and I've also attached some pictures of the EasyEDA 3D models. Thank you for your help.

https://preview.redd.it/jtyht9349eud1.png?width=1200&format=png&auto=webp&s=eae35252b3fa2cbedc1093854e98c6dd6d333b03

https://preview.redd.it/9oxjo9349eud1.png?width=1084&format=png&auto=webp&s=b0d05275e24e71f69490ff57695d627c9fdd2aad

https://preview.redd.it/mkwh59349eud1.png?width=1194&format=png&auto=webp&s=f228ac90f96cd9c008cbaaca316e1865900c37a5

This is a circuit for an 8 bit Analog to Digital Converter. I will try something more complex next week maybe.