Returning to the scheme: can one use ordinary elecrolytic 4.7uF capacitor of arbitrary voltage for C1 instead of tantalum electrolytic and strict 16v - is it crucial?will draw more mA than the circuit does.
Returning to the scheme: can one use ordinary elecrolytic 4.7uF capacitor of arbitrary voltage for C1 instead of tantalum electrolytic and strict 16v - is it crucial?will draw more mA than the circuit does.
Almost all the powerbanks i ever had had a "trick" to keep them on with low consumption devices, or even without anything plugged, the so called "always on mode".
That video made just to show led blinking. Of course i tried it with load.The circuit is meant to be used in parallel to another device that doesn't draw enough current for the powerbank to detect.
It is not meant to be used without any extra load. If you want to use it for this you will have to change the pulse width so by increasing the 2k2.
That video made just to show led blinking. Of course i tried it with load.
Yeah, i've seen from ne555 calculator link you provided, that increasing R3 will increase duty cycle, and seen from usb-doctor that even 70mA is enough for one powerbank to stay on so I left R1 as it is and played a bit with R3 - 68KOhm seems to work at least for one of two powerbanks (PS 47KOhm is good too, but 20KOhm and below - not). That is enough for me. Thanks.When the powerbank still shuts off even with the intended load you need to change the duty cycle by changing the 2k2 value (higher value = high current is drawn longer = higher overall extra current draw.