Thursday, 30 January 2020

arduino - Can I use TI's cc2541 BLE as micro controller to perform operations/ processing instead of ATmega328P AU to save cost?

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I am using arduino pro mini (which contains Atmega328p AU ) along with cc2541(HM-10) to process and transfer data over BLE to smartphone. I...
Wednesday, 29 January 2020

batteries - Is it OK to reduce the charging current for a Li-ion 18650 battery?

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I am using NCR18650 batteries with the tp4056 charging module. When I connect the charger at 2.8 V (fully discharged), the tp4056 IC is gett...

microcontroller - Help with this protocol - LCTC

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I have a 640x200 monochrome display from a HP 200LX palmtop computer. On its PCB I can see two types of ICs: HD66204TFL and HD66205TFL fr...

solar cell - Difference between indoor and outdoor PV panels

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I am building an energy harvesting sensor for building installation, and I have to choose between two panels: Indoor , 5V, 47uA Isc @ 200 Lx...

Power-on Reset for CD4017 gives unexpected results

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In the circuit below, a 555 timer produces approximately 1 pulse per second, and the CD4017 counts pulses. The initial state of a CD4017 is ...

Buck converter worked for 1000+ start/stop cycles with power from regulated DC power supply, failed with li-ion battery

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I have a project which uses a TI step down converter ( LMZ14201 ) to buck an input voltage (up to 41V) down to a regulated 5V. Until now, I ...

operational amplifier - Deriving the formula of oscillation frequency for the Phase Shift Oscillator

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My aim is to find the oscillation frequency of a Phase Shift Oscillator . I start by finding transfer function of the cascaded RC network. $...