Gil
  • Member for 6 years, 1 month
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Best way to store very small amount of data?
29 votes

Personally I use FRAM, it is easy to use and you can get 32K by 8 for a few dollars. It works like the EEPROM modules but there is no delay or limits on reads and writes. These can be purchased on ...

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Why do typical DC motors use brush contacts rather than just conductors?
7 votes

Because the armature reverses polarity each time the brushes switch to the next commutator slot. If it did not switch it would not turn. In DC motors, we need a commutator or something for converting ...

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Cable standard for data and power
6 votes

I am taking a SWAG as there is not enough information to completely answer the question. Knowing the loads would help along with a rough schematic. Have you considered the size of the wire you will ...

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Oscilloscope low side connection
5 votes

I am not sure why you were making that measurement but it lead you to ask a good question. Normally the low side or common of the probe is connected to earth via the third pin in the plug in the scope ...

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Power conversion from button batteries to USB for Star Trek models
5 votes

You can do it several ways,the simplest is to add a diode in series with the 5V power, that will drop it by about 0.7V. This is what I would recommend. You can measure the current then calculate a ...

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Are 7555 inputs protected internally by diodes?
4 votes

Be careful, on Intersil's data sheet it states this: NOTES:. 4. Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater ...

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Short in MOSFET between Gate and Drain
Accepted answer
4 votes

When The Drain and Gate of a MOSFET are connected together, A two-terminal device known as a ''diode-connected transistor'' results. if drain and gate is shorted then MOS will behave as a diode ...

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How can human finger pressure be measured?
4 votes

Look at a strain gauge, they make some very small ones that should work. You could also adjust the sensitivity over time or a learning method and as the patient improves so does the force required.

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What is to be used to switch the load: Relay or MOSFET?
4 votes

If you want to use a MOSFET, my preference, you need to chose one suitable for the application. This includes current, voltage, load, etc. With the Arduino you need a Logic Level preferably a UIS ...

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Where to start on creating radio circuits
Accepted answer
3 votes

Get a copy of the "ARRL Handbook 2021" from your local library, it is a Six-Volume Book Set. It should show what you are trying to decode but you will have to interpret it as I do not ...

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Whats the justification to determine the phase sequence?
3 votes

The phase sequence determines which way an AC motor will rotate. This is very important with pumps and other pieces of mechanical gear.

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Have I understood the principles of MOSFET gate drivers correctly?
2 votes

There is a good explanation on this forem, check out BJT push-pull for a MOSFET it well documented. I think this will answer your questions.

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Need help with a replacement thermistor
2 votes

I entered the numbers you so plainly showed on the device and got an immediate hit. It is an electronic fuse or Polymer PTC. Here is the link so you can check it yourself: http://www.hr-ptc.com/en/...

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CAN bus voltage too low but resistance ok
2 votes

CAN is a differential bus, not a voltage driven bus. A voltmeter is not the best tool for determining if it is working. From your CAN Low and CAN HIGH measurements you should have about 60 Ohms, not ...

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Long-distance Arduino buttons crosstalk over Cat5e cable
2 votes

Connecting the microprocessor pins to the outside world is shaky at best. You need to use some sort of interface to clean up the signal and isolate the micro from the outside world. A simple voltage ...

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5-24 Voltage Input to 5V/500mA Output
2 votes

What you are looking for is a SEPIC (single-ended primary-inductor converter). As long as the input voltage is in its range it will maintain the output voltage even if it is greater than the input. ...

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Please help me understand the reason for using this 5V battery and 2k resistor at the gate of this MOSFET
2 votes

Part of your problem is the way it is drawn. Logically it will work* as drawn. Remove the battery and put R3 to the V+, at that point you can see the bias on the MOSFET which will turn it on. This ...

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2.4GHz extension for RC
2 votes

You do not want to change the transmitter, it will alter its characteristics and mess up communications on other bands. Making this change is also illegal in the USA and many other countries. However ...

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I need to slow down about 4-5 times a low DC voltage motor
2 votes

Without a schematic It is impossible to tell. I believe you read diodes in series, not parallel. Your battery is 1.5V subtract 0.7 (voltage drop across one diode) from that you get 0.8V by using just ...

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An unusual trimmer resistor
2 votes

These were common in vacuum tube electronics. They were referred to as a power resistor. I remember IRC as one brand and probably have a few around. Vacuum circuits consumed a lot more power (both ...

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Sanwa YX360TRF cannot zero-ohm adjust
Accepted answer
2 votes

Check your fresh new batteries. It is not that expensive to replace. Try to get the service manual and proceed from there. You should be able to find it online,

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How do I step down a 12V pulse width modulation signal to 5V?
2 votes

I would suggest using a bi-directional level shifter, they are inexpensive, apparently less then unidirectional modules and are readily available. They are not that expensive and the parts are already ...

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Changing motor RPM
2 votes

I would suggest a VFD (Variable-Frequency Drive) it should do the job nicely for your application. A VFD can be gotten in the $100 or less depending on source. Another possibility is a inverter drive ...

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Boost converter extremely low efficiency
Accepted answer
2 votes

Take a look at the curves they published, What you are getting sounds somewhat close. I know you are losing voltage in the current measurement, that is the way they work. The max with one volt in is ...

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Is it ok to place 220V AC traces on my Arduino PCB?
2 votes

Before proceeding with the PCB layout I would check with the appropriate agencies in your country and see what the rules are. Maybe UL, CE and others. From what I see in your PCB layout expect it to ...

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Why is my MOSFET ON when there is no gate voltage and OFF when there is a gate voltage?
1 votes

There are several different types of MOSFETs, in your case you have chosen a N-Channel MOSFET which requires the gate to be positive to the source by at least 3.7 volts, a few more volts will only ...

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DSP Fır filter speed
1 votes

Welcome, You ask: What does the speed of calculating the Fir filter depend on in the Dsp? Is it dsp clock? Yes Or the speed of instruction? Yes In which unit of the DSP are these calculations ...

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Why is the tip of my PL-259 connector sheared off?
Accepted answer
1 votes

That is the way they are manufactured. It makes them easier to connect and facilitates the soldering process. You will find many variations of this but most I have seen have the angle or notch on the ...

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Why is a secondary transformer winding for VT filament heater connected to rectified output?
1 votes

It is acting like a diode, the filament is the cathode connection. This was common in the previous vacuum tube erera, it saved a pin. Careful if you build it, they can give you a nasty shock. the ...

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What manufacturer is this contact?
1 votes

You are correct, Audi uses TE/Tyco connectors but not always nor exclusively. You may check Bosch. The year and model will have some bearing on the connector as well. What I have is probably not good ...

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