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1) Circuit construction error, is driver return and source really connected? or MOSFET may be blown. MOSFETs almost always fail short, in my experience.
2) Reduce the collector resistance or drive LED harder, more power -- but greater bandwidth.
3) Buck with switch on low side... usually...
This LM2577 circuit looks like it will meet requirements. However, the condition of the battery that you have on hand is the big question. Is the battery degraded or even rated for 2 Amp current draw? The conversion from 6V to 12V would require over 2A at 6V. Can the battery maintain 5-6V at...
Check out Xilinx's microcontrollers picoBlaze that use a small amount of CPDL gates. Ok it is 8 bits, but that is handy for a reasonable amount of address space. 8 bits it more useful because it takes two 8 bit additions for a 16 bit total addressing calculations using central 8-bit ALU...
Hobby Tx are on continuously and then off-keyed for short ~50uS of pulses, according to old ARRL Handbook chapter about PPM. The frame separator or blanking time is longer circa 50 ms and since any interference would add to the strength there would be no glitches, even though the 50microsecond...
The cell voltage does not vary a great deal, for example fully charged 4 cell NiMH measured around 6V. Used this output through a diode to drop 0.7V for 5V+-10% until battery flat at circa 5.2V. The power requirements for your router are small enough that a boost circuit, if needed could power...
During the 10 millisecond frame separator can the transmitter remain on? or do you want to transmit in burst?
If burst mode then before each PPM data frame a training/sync preamble would tell the radio front end and baseband logic that this is real data, not noise impulses and so.
The 8051 has mov A,direct and mov A,#immed. SBUF can be simply read by mov A,SBUF(direct addressing)
because the SBUF is in the 128 byte direct addressing area .
in contrast to MOV A,#SBUF(immed), then using a second indirect memory access which would be needed for direct memory over address...
The movc A,@A+dptr after mov A,SBUF is puzzling to me.
From Keil: The MOVC instruction moves a byte from the code or program memory to the accumulator.
A = (A + DPTR).
This will overwrite SBUF transfer into A.
Keeping the carrier on and using the cut off of the carrier to mark the positions is good practice xD. If a micrel OOK RF demodulator is used the AGC time constant can be adjusted to avoid the gain ramping up too fast during off keying. By the description, it reads like the discussion is about...
A simple check is to use a lab power supply to set the input voltage to 8.5V and check router function. Going to a lower voltage will not damage anything but depending on the router circuitry may not function at the lower voltage.
The LM317 is not needed because the router power supply will...
Perhaps, first check if 12V 1A is really needed. Most routers have circuitry to step down 12V to 5 Volt,3.3Volt and so forth already on board and input can vary from the 12V. So depending on the exact design of router circuitry the input may have a range to get 12W power needs, i.e. so with a...
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