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Simulate or Calculate Inductor Flyback Voltage from Component Parameters?

simulate this circuit – Schematic created using CircuitLab Top circuit can be used to simulate the increase in velocity of the JATO Powered Chevy featured in the first episode (and subsequent ...
SystemTheory's user avatar
1 vote
1 answer
31 views

Converting air compressor to gas but leaving ac motor on

I have a compressor with the crankshaft being the the front part of the shaft of an A/C motor's armature.. The rear of the AC motor's armature has enough protruding shaft to put a pulley on it and ...
De ho's user avatar
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2 votes
1 answer
131 views

What is the proper name for a rotary relay?

Pre-1960, it was not rare for electronic devices to contain some kind of wheel or roller with circuit board traces on it. These traces would temporarily form connections between contacts as the wheel ...
James Strieter's user avatar
0 votes
4 answers
454 views

Mechanical design of a 7 segment display

If I want to custom design a 7 segment display, I can design a pcb with LEDs etcetera, but where could I find guides on how to design the shroud (shrouding the LEDs from each other, so they don't ...
kando's user avatar
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29 votes
1 answer
4k views

How is it possible that HDDs are mechanically so robust?

Hard disk drives (HDDs) rely on a small read-write-head which hover about 70 nm over the platter 1, 2. The physical effect on which this hovering is based seems to be the ground effect 3, so it seems ...
cakelover's user avatar
  • 453
1 vote
2 answers
171 views

Can a DC motor safely exert torque opposite its direction of rotation?

I have a shaft that will turn in direction A. I want it to continue turning in direction A. I want a motor (preferably DC) to exert torque opposite direction A. Throughout most of its life, the motor ...
James Strieter's user avatar
2 votes
2 answers
1k views

Mechanical switch performance at high frequency (100MHz)

At high frequencies (>100MHz), "analogue multiplexer" branding gives way to "rf-switch" branding for switches which are controlled by logic levels. But if computer control is ...
Edwin Shepherd's user avatar
2 votes
2 answers
243 views

Ebike battery sizing

I am building a homemade ebike using a treadmill motor. I know this motor is not the best for ebike application, but I am trying to work with what I have and see how far I can take it. I am wondering ...
MechEboss's user avatar
0 votes
1 answer
147 views

How does this relay work?

I took apart an old dark-activated switch yesterday and found an interesting electromechanical switch inside. I think it's a relay, but I'm a little mystified by the principle of operation because ...
shwoseph's user avatar
  • 225
2 votes
1 answer
93 views

Overvoltage protection with a mechanical relay

12 VDC automotive environment, protecting the logic-level silicon. Instead of, say, the crowbar's thyristor, one could actuate a mechanical relay and cut no more than 10 A. Will that be enough to ...
kellogs's user avatar
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-1 votes
2 answers
79 views

Advice for an experiment [closed]

I am thinking to do an experiment which is a piston crank mechanism that works on the magnetic force attraction and repulsion. I want to place a stationary ferromagnetic bar in a coil of wire near the ...
Jesse Flynn's user avatar
8 votes
2 answers
1k views

What kind of tactile switch is this?

I am trying to find some tactile switches similar (or even better, identical) to the ones shown. They are two stage, multi-way configuration. Depressing one click connects the common pin to pin 1, and ...
Mickrige McMahon's user avatar
0 votes
0 answers
33 views

A simple electro-mechanical model of a DC brushed gearmotor

I'm trying to arrive at an estimate of motor angular velocity during startup phase, specifically the time it takes for the output shaft to rotate n degrees from power on. I'm looking at DC brushed ...
Paul Jurczak's user avatar
0 votes
3 answers
171 views

Is there an electromechanical equivalent of an SPDT switch? [closed]

I want to control 2 outputs with a single input. SPDT switches are mechanical from what I understand, is there an equivalent of electromechanical switches like SSR for SPDT for example?
hello_world07's user avatar
0 votes
0 answers
238 views

Question regarding an electromechanical system of simplified capacitor microphone

The electromechanical system represents a simplified model of a capacitor microphone. The system consists in part of a parallel plate capacitor connected into an electric circuit. Capacitor plate a is ...
SharonZh's user avatar
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0 answers
26 views

Electromechanical relay AC load synchronization

I am trying to check the durability of a relay (G5LE family, 5v relay). I wanted if the relay contacts will still work after a certain number of cycles (ex. after 1 million switching cycles). I am ...
user139731's user avatar
1 vote
0 answers
465 views

Linear actuator is not working with BTS7960

I am trying to run a linear actuator with a BTS7960 motor driver and an Arduino UNO. The code seems fine, wiring seems fine but after uploading the code, the linear actuator does not start. I am using ...
Muskaan's user avatar
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0 answers
52 views

Why should we choose to go for a smaller motor (4.5 kW vs 6 kW) for go-cart?

We are thinking of using a 4.5 kW motor and not a 6 kW one. Due to some constraints and rules, the maximum power a motor can have is 6 kW. So why is it recommended to use a smaller motor? And does it ...
THE EV GUY's user avatar
0 votes
1 answer
594 views

Why 10-pin and 6-pin ISP?

I have another curiosity question: Why is there a 10-pin AVR ISP connector and a 6-pin version? It seems that the only difference is that the 10-pin version uses the extra pins for a heap more ground ...
Artichoke's user avatar
  • 447
0 votes
1 answer
511 views

Laplace transform rotational mechanical system

I have a system with an input torque Te and output angular velocities w1 and w2. I have defined the outputs relative to the system however cannot seem to work out how to find GM(s). omega2 is the ...
S123l2000's user avatar
3 votes
2 answers
360 views

1980s AVTEL 4 colour mechanical display, how is the pixel state reset?

I stumbled on a retro Dutch video from 1983 where a large four color mechanical display is shown. Each pixel consists of a cube which can be turned in order to change the pixel color between 4 colors (...
BuysDB's user avatar
  • 31
0 votes
0 answers
250 views

visual studio gui to control stepper motor

I am using visual studio 2019 and wants to build gui to give commands like speed to control stepper motor through arduino. I am new to visual studio. can someone share code or can explain? Thanks
Muskaan's user avatar
  • 23
1 vote
1 answer
346 views

PCB pancake slip ring brushes [closed]

I am designing a mechanical attitude indicator for the avionics simulator. I need a pancake slip ring, that drives servo (max 500mA at 5V) and some backlight. My idea is to use a gold-plated PCB and ...
FeroFixxer's user avatar
0 votes
1 answer
173 views

What is the terminology of, and relationship between, these two characteristics of gimbal motors?

I am currently tinkering with robotics projects to help me learn electronics, and I just started learning about motorized gimbals. After observing various gimbal motors, I've noticed two interesting, ...
The Pointer's user avatar
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0 votes
0 answers
113 views

How do you do Electro-mechanical Assembly Documentation?

I realize this isn't specifically EE theory related, but I hope EE documentation advice falls within the scope of this forum! For example, I have an enclosure from a mechanical engineer, and their ...
vkaiser's user avatar
4 votes
2 answers
2k views

Why do small dc motors have round shafts?

Small dc motors like the one below are commonly used for various tasks in toys and small appliances. These motors almost exclusively have perfectly cylindrical round shafts without any notches that ...
Busti's user avatar
  • 457
2 votes
1 answer
3k views

PCIe card dimension half-length 106.68 mm × 175.26 mm specification deviation

As per Wikipedia and other sites, the dimensions of the half-length PCIe card are 106.68 mm × 175.26 mm. But as per the specification: Kindly clarify how the length of 175.26 mm has been arrived ...
Prashanth Kumar G N's user avatar
1 vote
2 answers
113 views

Does it matter if power is applied only instantaneously?

If I build a railgun and apply say, 1 million watts, to the circuit to try to power a projectile forward through electromotive force, will it really matter if that 1 million watts of power is applied ...
Dorky's user avatar
  • 13
0 votes
0 answers
357 views

How can I use pull up and pull down resistors in an H-bridge?

I have to build an H bridge out of the following components 2 PNP transistors 2 NPN transistors battery 9V 4 resistors for the transistors a DC motor I connected the above equipment but, I also ...
engineer 101's user avatar
-1 votes
1 answer
502 views

Can a stepper motor produce enough torque to open a door?

From a few sources, I read that a stepper motor produces more torque at slow speeds. I want to create an automatic door opener (for a living room). Can a stepper motor produce enough torque for this ...
user avatar
-4 votes
1 answer
127 views

Creating lung ventilation to fight COVID-19 [closed]

I'm just wondering why world has not enough lung ventilation systems to fight of COVID 19. I suppose it should be not very difficult to create DIY lung ventilation project. I suppose there should be ...
vico's user avatar
  • 151
0 votes
3 answers
64 views

Persistent Mechanical Feedback

I am looking for a device (preferably in a small form factor) that can provide feedback for the user even after the power has been removed from the PCB (No, I don't want a battery powered solution.). (...
Cerike's user avatar
  • 561
0 votes
2 answers
360 views

Maximum temperature of an electric motor and proper cooling system

I have found an electric motor in my home and I want to estimate how much time it can operate until its temperature becomes too high and eventually build a cooling system for it (I have seen that ...
Kinka-Byo's user avatar
  • 3,490
0 votes
1 answer
319 views

How does conduction angle through a bridge rectifier affects generator performance (vibrations, etc.)?

Consider this scenario: A 3-phase permanent-magnet generator is being driven by a strong force and at varying speeds e.g. 1000-6000 RPM Its output is rectified via a 3-phase bridge rectifier The ...
anrieff's user avatar
  • 5,429
1 vote
0 answers
32 views

Does a hybrid DC relay suffer from contact erosion (albeit much less than normal), or is it effectively eliminated?

Given a hybrid DC relay, I've been wondering if contact erosion is occurring (albeit at a slower rate), or if the design eliminates this entirely. (Assume that there is no snubber or other contact ...
User Hostile's user avatar
1 vote
3 answers
812 views

What does it mean to soft switch a relay?

I am specifying a relay I/O card for a Beckhoff PLC. (Link to an overview of Beckhoff digital output slices, scroll to see Relay section) Some of the relays have ...
Intrastellar Explorer's user avatar
1 vote
1 answer
138 views

What were the transfer curves of major recording technology from Wax cylinders to HiFi electronics? [closed]

I am interested in the evolution of the quality / fidelity of audio recording. Specifically in the actual frequency response curves and dynamics behavior of those technologies, not just rough ideas. ...
user1847129's user avatar
0 votes
1 answer
717 views

Avoiding mechanical shock damage on a PCB

I'm currently working on a PCB design that will have to go in a plastic enclosure. This plastic enclosure will have to endure severe shocks (dropped from 2m to ground) so I'm looking for ways to ...
Prof_Sims's user avatar
  • 110
3 votes
2 answers
284 views

Anyone got these optical encoders working? [closed]

I got these Optical Encoders from a local vendor and connected it to my arduino in the following order; (+)----> 5v (-)---> Gnd (01)--->2 (02)--->3 But, it burnt and smoked out as soon as I ...
Samiul Hoque's user avatar