Mark Harrison's user avatar
Mark Harrison's user avatar
Mark Harrison's user avatar
Mark Harrison
  • Member for 13 years, 5 months
  • Last seen more than a week ago
8 votes
5 answers
1k views

What does this circuit on a t-shirt do?

-1 votes
1 answer
397 views

emitter/collector/base vs source/drain/gate terminology?

1 vote
1 answer
46 views

Is a TP5100 module redundant with "protected button top" 18650 cells?

5 votes
2 answers
710 views

Charging two 18650 cells connected in series?

1 vote
0 answers
184 views

What thermistor for a TP4056 lithium charge module?

0 votes
1 answer
68 views

Regulating 4 AA batteries to 5V over the discharge cycle of the batteries?

0 votes
1 answer
46 views

ECAD Program that knows about breakout boards?

6 votes
4 answers
2k views

What is this type of small tab-like connector called?

1 vote
2 answers
181 views

How can I identify the names of different connectors?

1 vote
2 answers
2k views

Testing an audio amplifier using a signal generator?

110 votes
4 answers
107k views

How do I calculate the required value for a pull-up resistor?

18 votes
3 answers
26k views

Safety Guidelines for Ultraviolet LEDs?

2 votes
4 answers
6k views

Why are lithium-ion batteries stored at 50% voltage and not a lower voltage?

121 votes
9 answers
129k views

Tradeoffs when considering SPI or I2C?

3 votes
1 answer
3k views

What does "WROOM" mean?

2 votes
1 answer
3k views

LiFePo4 Battery Cells, minimum and maximum charge?

0 votes
2 answers
825 views

Converting a 4-20mA 24V signal to 0-5V?

3 votes
1 answer
452 views

Is there a convention as to placing a resistor before or after an LED?

0 votes
2 answers
323 views

How much time to I have to switch outputs on a CD74HC4067 multiplexer?

8 votes
2 answers
2k views

Is there such a thing as a programmable power sink?

2 votes
2 answers
1k views

Are there any advantages to an inverted serial prototocol?

2 votes
2 answers
5k views

Putting two wall-warts in series?

3 votes
2 answers
1k views

What does it mean to "swamp" a radio signal?

2 votes
2 answers
224 views

What is "high voltage programming", and why do some MCUs use it?

3 votes
3 answers
3k views

Deciding between 7.4V and 11.1V power

0 votes
1 answer
177 views

What is the two-pin polarity indicator for a PCB? [duplicate]

35 votes
4 answers
50k views

Safe current limit for human contact?

5 votes
2 answers
2k views

How to calculate necessary resistance to dim some LEDs?

14 votes
3 answers
24k views

What is a PA/LNA?

18 votes
3 answers
20k views

Simple capacitor use for buffering a battery?