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1 vote
2 answers
230 views

Simplest option for generating audio tones?

I'm looking for the simplest way to generate audio tones. Something like a square or sine wave, but I want multiple tone options. For example, two quick beeps, one at 440Hz, one at 1Khz. The tones ...
user11015833's user avatar
7 votes
1 answer
747 views

FCC verification for PCB business card?

FCC regulations apply to unintentional radiator devices, but provide exceptions for subassemblies, including this one: CPU boards, as defined in §15.3(bb), other than those used in personal computers,...
Joey Shepard's user avatar
2 votes
1 answer
794 views

Clarification about FCC exemption for subassemblies

please kindly help me understand the "subassembly" exemption of the Part 15 certification requirements regarding intentional radiators. I want to produce and sell a MCU board which includes wireless ...
Ryan Griggs's user avatar
  • 2,726
9 votes
5 answers
2k views

Does anyone know of a microcontroller/DSP with no clock speeds or any oscillators in excess of 1.705 MHz?

I am planning on making a simple electronic device which I might eventually try to market if it works out O.K. Before taking the plunge and trying to mass produce it, I would first try to sell a few ...
w1res's user avatar
  • 199