User glen_geek

39 votes

Accepted

Is it possible to jam wireless home alarm systems?

answered Feb 28, 2017 at 19:30

38 votes

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Why is crystal frequency often multiplied inside a microcontroller?

answered Mar 12 at 14:26

29 votes

I have 5 kV available to create a spark. Is limiting the current to 500 µA as simple as putting a 10 MΩ resistor in series?

answered Nov 30, 2022 at 20:34

21 votes

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What is this waxy stuff?

answered Jul 14, 2017 at 13:33

21 votes

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This op-amp buffer is oscillating and I can't figure out why

answered Dec 22, 2018 at 15:36

20 votes

Circuit for flashing LEDs for airplane model wing, tail and beacon lights using 555

answered Jan 13, 2017 at 15:33

20 votes

Why doesn't the capacitor fill to the maximum?

answered Oct 4, 2022 at 16:12

18 votes

Would you approve this soldering job?

answered Jun 3, 2020 at 16:12

17 votes

Why is my linear taper potentiometer nonlinear at the end points?

answered Jul 24, 2017 at 14:21

16 votes

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Why does a full-wave bridge rectifier have noisy output with no load?

answered Jun 10, 2022 at 11:21

16 votes

What purpose are the transistors serving in this CRT oscilloscope circuit?

answered Feb 13, 2020 at 0:11

14 votes

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Crater-like features on thick leads soldering - is this a soldering defect and should I be worried?

answered Dec 28, 2021 at 15:40

14 votes

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pull-ups between logic gates

answered Dec 18, 2019 at 16:34

14 votes

What is the need for using active low inputs like EN' (read as "Enable bar") in digital electronic circuits?

answered Jul 16, 2020 at 13:27

13 votes

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Is it possible for an opamp to oscillate at a frequency greater than its GBP?

answered Sep 28, 2017 at 14:19

13 votes

Can I disable a battery powered device by reversing half of its batteries?

answered Sep 9, 2019 at 23:06

12 votes

How did old television screens with a light grey phosphor create the darker contrast parts of the display?

answered Feb 7, 2021 at 15:54

11 votes

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How to set an oscilloscope for measurement of interrupt service routine execution time

answered Jun 26, 2020 at 13:47

11 votes

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Polarity of gas discharge tubes

answered Sep 1, 2019 at 15:06

11 votes

Non-inverting amplifier ; Single supply ; Bipolar input

answered Jun 30, 2019 at 19:40

11 votes

A really basic question about ammeters and their ranges

answered Dec 4, 2019 at 17:11

10 votes

Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope

answered Feb 18, 2021 at 14:06

10 votes

Are there two sorts of geometry of JFET?

answered Jul 19, 2021 at 13:33

9 votes

Anyone recognise this capacitor and its symbol (circle with dot)?

answered Jan 3, 2018 at 17:32

9 votes

Can LED be used for both light emission and sensing

answered Jun 14, 2017 at 15:55

9 votes

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Issue with NPN transistor as a switch

answered Jul 6, 2022 at 18:44

9 votes

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Buttons that do not bounce or scopes that pretend to be 100 MHz but actually aren't?

answered Aug 25, 2022 at 13:09

9 votes

Accepted

Homemade high-voltage probe not dividing the voltage by proper amount

answered Dec 25, 2022 at 19:11

9 votes

How can I make a reliable tick tock sound electro-mechanically?

answered Feb 11 at 3:50

9 votes

Amplify difference between two photodiodes

answered Mar 29, 2021 at 17:33

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805 Answers

Is it possible to jam wireless home alarm systems?

Why is crystal frequency often multiplied inside a microcontroller?

I have 5 kV available to create a spark. Is limiting the current to 500 µA as simple as putting a 10 MΩ resistor in series?

What is this waxy stuff?

This op-amp buffer is oscillating and I can't figure out why

Circuit for flashing LEDs for airplane model wing, tail and beacon lights using 555

Why doesn't the capacitor fill to the maximum?

Would you approve this soldering job?

Why is my linear taper potentiometer nonlinear at the end points?

Why does a full-wave bridge rectifier have noisy output with no load?

What purpose are the transistors serving in this CRT oscilloscope circuit?

Crater-like features on thick leads soldering - is this a soldering defect and should I be worried?

pull-ups between logic gates

What is the need for using active low inputs like EN' (read as "Enable bar") in digital electronic circuits?

Is it possible for an opamp to oscillate at a frequency greater than its GBP?

Can I disable a battery powered device by reversing half of its batteries?

How did old television screens with a light grey phosphor create the darker contrast parts of the display?

How to set an oscilloscope for measurement of interrupt service routine execution time

Polarity of gas discharge tubes

Non-inverting amplifier ; Single supply ; Bipolar input

A really basic question about ammeters and their ranges

Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope

Are there two sorts of geometry of JFET?

Anyone recognise this capacitor and its symbol (circle with dot)?

Can LED be used for both light emission and sensing

Issue with NPN transistor as a switch

Buttons that do not bounce or scopes that pretend to be 100 MHz but actually aren't?

Homemade high-voltage probe not dividing the voltage by proper amount

How can I make a reliable tick tock sound electro-mechanically?

Amplify difference between two photodiodes