User Ricardo

42 votes

7 answers

67k views

What happens if I omit the pullup resistors on I2C lines?

asked Mar 12, 2014 at 3:14

39 votes

7 answers

68k views

Why should I use a logarithmic pot for audio applications?

asked Feb 27, 2014 at 17:34

20 votes

3 answers

40k views

Is there a popular small signal PFET equivalent to NFETs 2N7000 or BS170?

asked Apr 29, 2014 at 16:55

16 votes

3 answers

9k views

Why is there a 0R resistor linking GND and AGND in analog voltage reference circuit?

asked Oct 15, 2014 at 2:21

12 votes

1 answer

19k views

How long will a DS1307 RTC run on a CR2032 coin cell battery?

asked Oct 18, 2013 at 17:29

8 votes

3 answers

14k views

How is the clock frequency established between master and slave in I2C protocol?

asked Mar 13, 2014 at 13:40

8 votes

1 answer

8k views

How to place thermistor for reading temperature in NiHM single AA cell charger?

asked Oct 19, 2014 at 0:14

8 votes

2 answers

11k views

What's the purpose of a ferrite bead inductor on this circuit?

asked Oct 15, 2014 at 2:02

7 votes

4 answers

3k views

How to shorten fall time on high-side BJT drive?

asked Oct 24, 2014 at 2:53

7 votes

2 answers

11k views

Problems with homemade RS232-to-TTL converter board based on TI's MAX232

asked Mar 28, 2014 at 1:47

7 votes

1 answer

896 views

LTC3525 datasheet states that capacitors must be X5R or X7R, not Y5V. Why?

asked Jun 26, 2014 at 16:27

6 votes

2 answers

3k views

How to transition from using linear to switching voltage regulators?

asked Nov 21, 2013 at 17:12

6 votes

1 answer

10k views

How does this 4-transistor DC-DC 1.5V to 9V boost converter work?

asked Sep 27, 2015 at 13:46

5 votes

4 answers

1k views

Why would a designer choose to use two AND'ed input shift register such as the 74HC164?

asked Jan 13, 2016 at 11:25

5 votes

2 answers

1k views

How is the current limited through the LEDs in this LED matrix design?

asked Feb 12, 2017 at 16:14

5 votes

1 answer

3k views

Hotel keycard switches on 5,000W load when placed in its holder. How does it do that?

asked Dec 4, 2013 at 20:33

4 votes

3 answers

1k views

Can I switch between two analog references to read signals with different ranges with the ATmega328P?

asked Jul 5, 2014 at 20:51

4 votes

1 answer

2k views

Why is there a 100nF capacitor in the Arduino Severino reset line?

asked Mar 30, 2014 at 2:31

4 votes

3 answers

451 views

Help troubleshooting an unstable 595 shift register

asked Apr 23, 2022 at 22:09

3 votes

1 answer

2k views

How to suppress voltage spikes caused by USB fan on ATX 5V rail?

asked Mar 8, 2016 at 0:27

3 votes

1 answer

4k views

How to drive 3 1/2 digit static TN LCD with ATmega328 in low power mode?

asked May 9, 2015 at 21:55

3 votes

2 answers

5k views

How does this pulse amplifier work?

asked Sep 12, 2015 at 22:24

3 votes

1 answer

2k views

How does this battery simulator work?

asked Dec 24, 2014 at 0:41

3 votes

3 answers

973 views

Boost DC voltage converter for wireless temperature sensor (1.5V to 5V)

asked Jun 1, 2014 at 18:34

3 votes

2 answers

14k views

How to drive a 12V common cathode 7-segment display with 5V signals and BJT transistors?

asked Sep 29, 2013 at 20:56

3 votes

1 answer

2k views

How to use Darlington arrays to source current in a 7-segment display driver

asked Oct 4, 2013 at 12:21

3 votes

1 answer

2k views

Why some LM25xx DC-DC adjustable step-up converters have two negative connections (IN- & OUT-) instead of only one ground?

asked Feb 27, 2014 at 13:05

3 votes

1 answer

467 views

DC-DC 12V converter using switching voltage regulators: heatsink dimensioning and board design

asked Dec 9, 2013 at 15:15

3 votes

3 answers

2k views

Designing ammeter for an external ATX power supply adapter

asked Jan 5, 2014 at 21:58

2 votes

1 answer

669 views

Choosing voltage regulator and battery for a compact RF remote control (transmitter)

asked Oct 25, 2013 at 16:25

Stack Exchange Network

51 Questions

What happens if I omit the pullup resistors on I2C lines?

Why should I use a logarithmic pot for audio applications?

Is there a popular small signal PFET equivalent to NFETs 2N7000 or BS170?

Why is there a 0R resistor linking GND and AGND in analog voltage reference circuit?

How long will a DS1307 RTC run on a CR2032 coin cell battery?

How is the clock frequency established between master and slave in I2C protocol?

How to place thermistor for reading temperature in NiHM single AA cell charger?

What's the purpose of a ferrite bead inductor on this circuit?

How to shorten fall time on high-side BJT drive?

Problems with homemade RS232-to-TTL converter board based on TI's MAX232

LTC3525 datasheet states that capacitors must be X5R or X7R, not Y5V. Why?

How to transition from using linear to switching voltage regulators?

How does this 4-transistor DC-DC 1.5V to 9V boost converter work?

Why would a designer choose to use two AND'ed input shift register such as the 74HC164?

How is the current limited through the LEDs in this LED matrix design?

Hotel keycard switches on 5,000W load when placed in its holder. How does it do that?

Can I switch between two analog references to read signals with different ranges with the ATmega328P?

Why is there a 100nF capacitor in the Arduino Severino reset line?

Help troubleshooting an unstable 595 shift register

How to suppress voltage spikes caused by USB fan on ATX 5V rail?

How to drive 3 1/2 digit static TN LCD with ATmega328 in low power mode?

How does this pulse amplifier work?

How does this battery simulator work?

Boost DC voltage converter for wireless temperature sensor (1.5V to 5V)

How to drive a 12V common cathode 7-segment display with 5V signals and BJT transistors?

How to use Darlington arrays to source current in a 7-segment display driver

Why some LM25xx DC-DC adjustable step-up converters have two negative connections (IN- & OUT-) instead of only one ground?

DC-DC 12V converter using switching voltage regulators: heatsink dimensioning and board design

Designing ammeter for an external ATX power supply adapter

Choosing voltage regulator and battery for a compact RF remote control (transmitter)