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12 votes
2 answers
998 views

How does this overvoltage protection work?

9 votes
4 answers
1k views

ATmega328P reading DIP switches using the lowest possible power

5 votes
8 answers
5k views

Cost effective way to protect circuit from overvoltage

4 votes
2 answers
841 views

MCU working at 3.3V and RS485 driver at 5V - how does this circuit work?

2 votes
0 answers
100 views

Arduino UARTS Auto addressing slaves

2 votes
1 answer
155 views

Detecting cut wire (tampering) for low power project

2 votes
1 answer
397 views

Step up 3.3V to 5V to use as power of op-amp

2 votes
2 answers
1k views

Linearizing a 0-10V non linear sensor

1 vote
1 answer
432 views

Overvoltage protection for DC controlled Device

1 vote
3 answers
795 views

Crowbar circuit design: choosing the correct parts

1 vote
3 answers
189 views

TLP184 Optocoupler - Something is going wrong

1 vote
0 answers
54 views

Noise suppress recommendation and best practices

1 vote
2 answers
1k views

POE Extraction and port reuse for POE Device

1 vote
1 answer
482 views

Analog input to ATMEGA328P using op-amp - how does this circuit work?

1 vote
1 answer
152 views

333mV Current transducer - how to read it and protect the Atmega328p input

0 votes
1 answer
280 views

Pi-matching impedance calculation for LoRa 868Mhz RFM95

0 votes
0 answers
258 views

Hardware watchdog for my ESP32 Board - circuit and design suggestion

0 votes
1 answer
85 views

How can I regulate 220 Vac fans with a microcontroller?

0 votes
0 answers
40 views

Drive 50 SPI oled displays with a single ESP32

0 votes
2 answers
256 views

Effective differences between MAX485EESA+T and MAX485ESA+T?

0 votes
1 answer
731 views

ADM2483 or MAX485 Design: Modbus RS485 RTU bus in harsh environment

0 votes
0 answers
28 views

Sequential access of 1-Wire devices

0 votes
1 answer
111 views

RS485 over CAN: when and why?

0 votes
3 answers
264 views

Step down 9-36V to 5V: Best and cheap way to power a Raspberry Pi

0 votes
1 answer
53 views

MCU - Two power input: from PoE and DC 12V Switch between them

0 votes
2 answers
79 views

Mosfet load control - different design compared

0 votes
1 answer
956 views

Multidrop RS232 - Diode selection and doubts

0 votes
1 answer
956 views

Switch "On"/"Off" RS485 data lines

0 votes
0 answers
51 views

RS485 Trancievers: ADM2483 VS ISO15

0 votes
1 answer
371 views

Troubleshooting I2C issues of ESP32-POE-ISO with LAN