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comment I want to create a custom computer board with USB and Ethernet feature that runs linux.
The minimum cost to buy one of these things is a few tens of dollars. The cost to build is months of work and several hundred dollars for the first unit.
Apr
24
revised How to detect the rising edge of a pulse that is not in sync with the clock
added 163 characters in body
Apr
24
answered How to detect the rising edge of a pulse that is not in sync with the clock
Apr
24
comment How to detect the rising edge of a pulse that is not in sync with the clock
IS this an interrupt pin configured as rising edge, or polling GPIO, or some other type of input? In either case, it'll certainly detect the edge provided the pulse is wide enough, but there will be a minimum latency.
Apr
24
answered Taking an unstable DC voltage, and stabilizing it
Apr
23
answered Does power make a king?
Apr
23
answered Valid use of ISR_NOBLOCK
Apr
23
comment heating problem - L7805C
Why are you powering a switchmode with a linear regulator?
Apr
23
comment Location of modulation and multiplexing in a GSM network
The phone transmits in its timeslot. Other phones transmit in different timeslots. The base station demultiplexes these.
Apr
23
comment Charging an RC circuit with two different Voltages?
Remind yourself of the formula for "RC time constant".
Apr
23
comment Location of modulation and multiplexing in a GSM network
Again, the multiplexing is for the purpose of transmission. It's the "radio burst multiplexing" box on the diagram.
Apr
23
answered Location of modulation and multiplexing in a GSM network
Apr
22
comment Why does GSM allocate 200kHz data bandwidth for each mobile phone?
There are multiple calls per channel. GSM fits 8 calls in one 200kHz channel. howardforums.com/showthread.php/…
Apr
22
answered Why does GSM allocate 200kHz data bandwidth for each mobile phone?
Apr
22
comment When multiplexing audio do I need a pre-amplifier for each channel?
Not necessarily this device, but something similar (preamp with integrated ADC) and then yes multiplexing the digital outputs.
Apr
22
comment When multiplexing audio do I need a pre-amplifier for each channel?
94dB SPL is REALLY LOUD.
Apr
22
comment How does a base station provide multiple channels without any interference?
There's only a small number of different carriers (I was hoping for a list, but I think it's about a dozen). TDMA lets you have more phones than channels.
Apr
22
answered When multiplexing audio do I need a pre-amplifier for each channel?
Apr
22
comment How does a base station provide multiple channels without any interference?
There are several carriers transmitted at the same time (and I believe from the same antenna) with slightly different carrier frequencies, although all within the same band.
Apr
22
comment How does a base station provide multiple channels without any interference?
"A physical channel uses a combination of frequency and time division multiplexing and is defined as a sequence of radio frequency channels and time slots. The complete definition of a particular physical channel consists of a description in the frequency domain, and a description in the time domain." (section 5) - no.
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