Questions tagged [electro-mechanical]

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PCIe card Dimension Half-Length 106.68 × 175.26 Specification Devaiation

As per the Wikipedia and other Sites, the dimension of the Half-Length PCIe card is 106.68 × 175.26, https://en.wikipedia.org/wiki/PCI_Express But as per the specification, Kindly clarify. How the ...
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2answers
87 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 ...
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0answers
74 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 ...
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1answer
90 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 ...
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1answer
109 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 ...
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3answers
60 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.). (...
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2answers
44 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 ...
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1answer
36 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 ...
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0answers
21 views

Bi-stable switch activated in both directions by a momentary electrical input

I am trying to find or build an electro-mechanical "switch" for a unique application. It should act a little bit like the snap switch used in thermostats (where a bi-metal disk snaps from concave to ...
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0answers
21 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 ...
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3answers
137 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 ...
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1answer
64 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. ...
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1answer
101 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 ...
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2answers
196 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 ...