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CC1101 with separate LNA and PA
I want to develop a bi-directional radio based on TI's CC1101 (868 MHz) and MiniCircuit's PSA4-5043+ (or RFMD's SPF5043Z). PSA4-5043+ and SPF5043Z are Low Noise Amplifiers with a very good gain and low noise figure. I want the radio to be half-duplex and, at the...
Does anybody know a serial (SPI, I2C) 32KByte SRAM supporting 2V - 3.6V voltage supplies? 23A256 is the closest solution I found but Vcc can go only up to 1.95V.
Thanks!
Thanks Barry for your response.
That makes indeed sense. I've tried with multiple diodes (schottky and not) with more or less the same result. I even tried with the MCU in place and without the clamping diode and got again the same issue, probably due to MCU's internal protection diodes. In...
I need to measure a low-power AC signal coming from a transformer and a voltage divider:
The above circuit provides a nice 5VAC (peak-to-peak) signal but then I need to avoid supplying negative voltages to my uC's ADC pin. I though in putting a clamping diode in parallel to the ADC pin as...
Small wireless Arduino. Atmega328P + CC1101 RF front-end:
https://www.panstamp.com
The panStamp project also provides the necessary libraries, communication stack and software tools to develop new devices, configure wireless networks and connect them to the IP world.
Hi,
I recently purchased some SCT-013 sensors from eBay (5A and 30A). This is the 30A version but the 5A one is very similar and includes the burden resistor too:
https://www.seeedstudio.com/depot/noninvasive-ac-current-sensor-100a-max-p-547.html?cPath=84_91
Well, my problem is that I'm...
FYI, I've found where the problem is. My FTDI IC's where bought from an eBay store, all showing a ref number "0550-A". Well none of these chips are able to regulate to 3.3V. Using new FT232RL IC's purchased from Mouser solved the problem.
Similar to this user:
https://www.edaboard.com/threads/210881/
I'm having problems with a custom FT232RL board. I've designed lots of FT232-based boards in the past, but always with an additional LDO to power my MCU from Vbus (5V). This time I want the FT232RL to power my MCU from its internal...
I've discarded the LTC3108 IC since it accepts a very limited input voltage range. Moreover, for optimum use of the energy stored in the supercapacitor, I want to connect the supercap to the input of the step-up converter (as showed in the precedent diagram). Using the LTC3108 would force me to...
Hi mkkeee. Please fins attached the schematics:
SRC is where the 2V solar cell is connected.
BAT, same for the supercapacitor
OUT: 3.3V regulated output
Thanks!
I recently built a solar-based system to power a custom (low-power) wireless board. This solar system was quite simple:
Solar panel --- NCP1400-based PSU --- Wireless board
The whole system works well under direct sunlight. However, out of direct sunlight and even with strong indirect sunlight...
Thanks Keith.
The few isolated DC/DC converters that I know are used in communication lines only. I've always thought that these converters do not work for stable voltages.
Could I maybe use one of these...
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