11 votes
Accepted

Unknown circuit component with glass encapsulated contacts

It looks to me like a reed switch (I can't be really sure though because the image is not clear enough). A reed switch is an electrical switch operated (usually) by an applied magnetic field. A ...
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  • 22.6k
4 votes

What are the differences between a standing wave ratio meter and a frequency counter?

The frequency of an electromagnetic wave (or any other wave form) is the number of times that the wave reaches the maximum over a specific period of time. This is common when referring to radio ...
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  • 6,192
3 votes

What is the function of jumper pins on a 4 channel relay?

Each channel can be set to be triggered high or low. See User Manual
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3 votes
Accepted

Electrical potential and grounding in a circuity, why it works?

The issue is certainly NOT that the chassis ground is at -100V, it's absurd. The chassis ground by definition is at equal potential for power supply and load, you can treat it like one big wire that'...
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  • 4,648
2 votes
Accepted

Power Electronics Project

You will need more than a 220V:12V transformer. Fullwave bridge rectifier output: $$ V_{DC} = 0.637\ V_{MAX} = 0.9\ V_{RMS}$$ This is the generic formula (textbooks), which gives you 10.8V. Higher ...
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2 votes

Simulation of RC circuit using Proteus

Try using a replacing a 9V VDC voltage source with a VAC voltage source. Pay attention to the frequency of the VAC voltage source. This should address the issue. With regard to determining the time ...
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1 vote

Motor that plugs directly into wall outlet

If you are willing to accept that one would have to attach a cord and a plug to match the outlet, one can use a microwave oven turntable motor. I have disassembled a number of discarded microwave ...
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  • 6,192
1 vote

How do solenoids work to push and pull?

The linear actuators can be many things. A solenoid coil (like you said) a worm gear with a rack a slider and crank mechanism etc. Regarding the solution, think of the two pins connected on the ...
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  • 22.6k
1 vote

How to Supply two different DC voltages using High Current

Just use 2 separate supplies (with appropriate current ratings). Or a 12V supply and a buck regulator. There are power supplies with 2 outputs, but they are generally designed for a specific purpose, ...
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  • 1,553
1 vote
Accepted

Why wouldn't grounding before a load in DC circuitry affect it?

It is not about density as such. It is about potential or electric field. There is an electric field which applies a force on the electrons from the negative pole to the positive. When connected to ...
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  • 591
1 vote

How to control the current while using "DC-DC XL6009 Adjustable Boost Step-up Power Converter Module Replace LM2577" in a circuit?

So you want the power to the modem ie 12V * 1A = 12W Then if you divide the power needed by the modem by the 5V of the powerbank you get: ...
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  • 13.9k
1 vote

How can I get more power out from a windmill motor?

As far my knowledge a dynamo is a motor which provides electricity when the rotor shaft is rotated. A dynamo will give DC output. An alternator will give AC output. If I connect multiple dynamos ...
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  • 8,229
1 vote
Accepted

Emulate normally closed relay with 2 normally open relays

You have a chance. This might work as a temporary solution. Figure 1. Switching DLRs off with an NO when headlights are on. How it works: When the ignition is on and the headlights are off the ...
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  • 8,229
1 vote

Is it still a bad idea to keep modern electronics plugged into the charger cable for longer than necessary?

AHh the battery problems of devices and the plug in myths. So to get past this on the get go, modern electronics using fancy chemistries monitor the voltages of the batteries being charged. Once they ...
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1 vote
Accepted

What's the function of those coils there?

The aux contacts are normally closed ... This is unlikely. I suggest that they are normally open and close before the main contacts do. You haven't provided a link for the MR PQM 500 system but I ...
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  • 8,229
1 vote

Embedded C Programming

This response is based on RX130 Capacitive touch development board as shown below IDE: e2Stuido v7.5 and above Toolchain: Renesas RXC toolchain Board: RX130 Capacitive touch development board MCU: ...
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