Questions tagged [regulations]
Regulations relate to various legal and/or political requirements relating to electronics design. Examples include various radio frequency broadcasting spectrum regulations, aeronautics regulations, etc..
82
questions
-2
votes
1
answer
88
views
Are there any regulations that disallow simple AC-to-AC mains to low voltage power supplies? [closed]
I have found that it's quite hard to find AC-to-AC adapters that convert mains AC to a low voltage AC. Usually most devices use AC-to-DC adapters for understandable reasons: electronics don't run on ...
- 1,762
0
votes
0
answers
37
views
Is there an equivalent to the 902-928 MHz ISM band for Europe?
Is there a band for Europe that is similar to the North/South American ISM band (902 MHz - 928 MHz) where custom short-range wireless signals (~100m or less, under 10 dBm) can be used without any ...
- 713
1
vote
1
answer
42
views
Creepage and clearance in a dielectric fluid
I'm designing a DC low voltage system ( 1000VDC) with immersion cooling. I have been referring to EN 60664-1 to size clearance and creepage distance, but this standard is ok for air only. Is there any ...
- 11
0
votes
1
answer
152
views
Infrared eye tracking - safe levels of infrared exposure on the eyes
I'm making an infrared eye tracker where an infrared light will be shone on one of the user's eyes, and a camera will capture the user's gaze, and I have a 940mm IR LED for this purpose. I have the ...
- 21
0
votes
0
answers
35
views
Control cabinet rules
I am building an electrical enclosure box equipped with a smart relay (PLC) and containing a 60W 24VDC power supply which is supplied from 230V AC. The PLC controlles a small 15W DC motor and ...
- 15
0
votes
2
answers
83
views
Current into DC/DC or LDO doubt
I need a circuit that regulate and invert the input signal 0-24V to 0-3.3V of output signal. Also a pullup that produce a low signal when the input is detached. I thought about a schematic like this. ...
- 61
7
votes
2
answers
663
views
Should RVs electrical system be grounded to chassis?
I have an RV with both 12V and 230V systems. The 12V uses internal battery, while 230V is supplied from outside via plug. Should I connect these systems to metal frame of vehicle (minus of 12V or ...
- 1,039
1
vote
1
answer
95
views
Pluggable cables for laptop computer power adapters
It has been nearly universally the case that the cable which connects an external power adapter (power supply) to a laptop computer is permanently fixed to the power adapter. This makes the cable more ...
- 25.3k
0
votes
1
answer
45
views
Y capacitors regulations at the secondary of a class-I power supply
I know safety-rated Y1/Y2 capacitors are required at the AC line input for EMI purposes, but what about the isolated secondary of a class I power supply?
What are the safety regulations here?
Can I ...
- 15
3
votes
0
answers
117
views
FCC exemption for sub 1.705 MHz devices
The exemption section of the FCC rules on unintentional radiators (Title 47, chapter I, Subchapter A, Part 15, Subpart B, Section 15.103) has the following item :
(h) Digital devices in which both ...
- 31
3
votes
1
answer
141
views
Safety regulations (USA) for high-power LED brightness (e.g. 1+ W)
For a "mostly" shielded sequence of 1 W where a user will see light bleed through small gaps in a device and (for argument's sake) might see a direct reflection of one of these 1 W LEDs (a ...
- 69
1
vote
0
answers
88
views
Why are conductive chassis double insulated appliances allowed in the UK?
MacBooks are infamous for 'buzzing' to the touch while charging. If another (properly Earthed) laptop touches one, it can flicker the screen or shut down. If I plug one of these same properly Earthed ...
- 307
0
votes
2
answers
54
views
Disable/enable confusion: is this an error in the design?
If Enable_Voltage is at 3.3 V then the disable pin is high and the chip (EMI transformer) is working.
Doesn't that mean the transistor is on and the enable voltage is short-circuited?
Is this the ...
- 97
2
votes
1
answer
462
views
CE certification of new project Radio Equipment Directive
I work at a certification Institute of construction products, but sometimes we do consultancy on other related products. Recently, a manufacturer asked us a regulatory/certification study on his new ...
1
vote
2
answers
1k
views
Are those electric fields dangerous?
Is 8.6 amperes per meter, 70 microtesla, 0.70 gauss, 695 milligauss, safe on long time exposure?
I am just worried.
