User DrMoishe Pippik

15 votes

PCB Trace Repair (Need to keep track shape?)

answered Dec 20, 2018 at 0:53

13 votes

Why are some capacitors bent on old boards?

answered Feb 15, 2021 at 2:37

11 votes

MOSFETs turn on without any voltage applied to the gate

answered Feb 14 at 23:46

7 votes

Meaning of resistor power rating

answered Jan 31 at 23:01

6 votes

Accepted

Connecting different Ah lead acid batteries in series

answered Jul 11, 2021 at 5:29

6 votes

Accepted

Need help identifying replacement components on PCB

answered Mar 3, 2019 at 22:58

6 votes

How does this circuit in an electric mosquito swatter work?

answered Jun 5, 2020 at 20:42

5 votes

Accepted

How can a battery get reverse charged? (other than by being charged backwards)

answered Jun 22, 2020 at 21:33

5 votes

Can I use a 2.4 GHz antenna for 900 MHz signal?

answered Dec 2, 2019 at 2:42

5 votes

Can you safely connect the LED side of an optocoupler to AC Mains(120v)?

answered Apr 26, 2021 at 22:05

5 votes

NPN transistor seems on even though base is grounded with resistor

answered Dec 22, 2022 at 20:20

5 votes

How can a failed furnace blower motor damage other equipment on a shared neutral?

answered Jun 2 at 23:05

5 votes

Is full wave rectified AC, without a smoothing capacitor, okay for switching a DC solenoid and a DC relay?

answered Apr 7, 2022 at 21:37

4 votes

Accepted

Does anyone know what the nitrogen gas on this telephone pole is for?

answered Jan 18, 2021 at 22:51

4 votes

What is the meaning of "longer electrical length = more wavelengths"?

answered Mar 7, 2021 at 19:27

4 votes

Accepted

Power indicator LED for 230VAC light circuit

answered Jan 12, 2022 at 21:56

4 votes

Accepted

What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?

answered Apr 1, 2022 at 22:08

4 votes

Rectify 220v ac to 220v dc using mechanical system

answered Feb 6, 2019 at 0:21

4 votes

Battery draining faster than predicted based on measured current draw

answered Nov 21 at 0:55

3 votes

Temperature sensor on a long wire (100ft)

answered Jul 9 at 23:56

3 votes

Accepted

Is it normal for the OC2 vacuum tubes to glow bright orange during operation & OA2 to flicker while running?

answered Aug 14, 2018 at 0:09

3 votes

Accepted

Ethernet transformer saturation at low frequencies

answered Jul 12, 2018 at 16:48

3 votes

Why there is no brushless field wound DC motor

answered Jul 29, 2018 at 2:26

3 votes

-12v supply from +12v

answered Aug 2, 2018 at 22:58

3 votes

How to check whether a byte of 8 bits contains 1, assembler 8051?

answered Mar 18, 2019 at 21:25

3 votes

Pre-amplifier input protection

answered Mar 27, 2019 at 23:32

3 votes

Creating higher voltage from DC motor?

answered Jun 4, 2019 at 23:32

3 votes

Accepted

Trying to attach resistor to MacBook logic board (a1278, 820-3115-b)

answered Jun 16, 2019 at 5:49

3 votes

Accepted

How do you make an antenna with length much greater than the wavelength work?

answered Jan 5, 2020 at 3:19

3 votes

LEDs have a low glow "noise"

answered Mar 19, 2020 at 22:03

Stack Exchange Network

178 Answers

PCB Trace Repair (Need to keep track shape?)

Why are some capacitors bent on old boards?

MOSFETs turn on without any voltage applied to the gate

Meaning of resistor power rating

Connecting different Ah lead acid batteries in series

Need help identifying replacement components on PCB

How does this circuit in an electric mosquito swatter work?

How can a battery get reverse charged? (other than by being charged backwards)

Can I use a 2.4 GHz antenna for 900 MHz signal?

Can you safely connect the LED side of an optocoupler to AC Mains(120v)?

NPN transistor seems on even though base is grounded with resistor

How can a failed furnace blower motor damage other equipment on a shared neutral?

Is full wave rectified AC, without a smoothing capacitor, okay for switching a DC solenoid and a DC relay?

Does anyone know what the nitrogen gas on this telephone pole is for?

What is the meaning of "longer electrical length = more wavelengths"?

Power indicator LED for 230VAC light circuit

What is the result of wiring an electrolytic cap in series with a ceramic when parallel was intended?

Rectify 220v ac to 220v dc using mechanical system

Battery draining faster than predicted based on measured current draw

Temperature sensor on a long wire (100ft)

Is it normal for the OC2 vacuum tubes to glow bright orange during operation & OA2 to flicker while running?

Ethernet transformer saturation at low frequencies

Why there is no brushless field wound DC motor

-12v supply from +12v

How to check whether a byte of 8 bits contains 1, assembler 8051?

Pre-amplifier input protection

Creating higher voltage from DC motor?

Trying to attach resistor to MacBook logic board (a1278, 820-3115-b)

How do you make an antenna with length much greater than the wavelength work?

LEDs have a low glow "noise"