In search of RF generator SDR transmitters can cover a large range.
https://www.rtl-sdr.com/tag/sign...
And can do so much more: TDR, antenna analysis, spectrum analyzer, sniffer. But...
Wednesday, 20 May 2020 - 13:13
Dumb MPPT question Battery charging involves maximizing current, not power. A properly sized PWM buck converter with current sensing can maximize that into any battery having voltage less than...
Photographic Flash Sources? What pulse length do you need? Flash tubes can be microseconds, An 80 lumen millisecond LED flash gives the same lumen-seconds as an 1 microsecond 80 klm flash tube. 80 lumens is...
Tuesday, 15 August 2017 - 23:34
ATtiny20 & measuring Vcc You need a way to display the result directly. I flash an LED for each digit, e.g. 3 flashes...pause...5 flashes...pause...6 flashes. Modulate it at 40 kHz and parallel with an...
Main power/Auxiliary battery Power switching If the circuit can handle varying supply voltage then you can simply connect a rechargeable (or not) battery across the external power supply. 3.55 volts is a good match for a...
How about feeding the AC through a polyfuse then saturable reactor that crowbars when DC is running through the control winding?
SDR transmitters can cover a large range. https://www.rtl-sdr.com/tag/sign... And can do so much more: TDR, antenna analysis, spectrum analyzer, sniffer. But...
Battery charging involves maximizing current, not power. A properly sized PWM buck converter with current sensing can maximize that into any battery having voltage less than...
Not aware of any issues measuring Vcc in the Tiny85. This gave consistent three digit precision in either mode: //Toss the first conversion, voltage probably not stable yet...
I use Tiny85s on each cell that sleep until reset, then send Vcc via RC-5 infrared pulses and sleep again. The max 4 volt offset between each Tiny is small enough to capacitor...
I use 10 amp-hour LiFePO4 cells connected directly to the output of USB-powered 3.5 volt regulaters (with 150 ma current limit). When USB is unplugged the battery takes over until...
What pulse length do you need? Flash tubes can be microseconds, An 80 lumen millisecond LED flash gives the same lumen-seconds as an 1 microsecond 80 klm flash tube. 80 lumens is...
You need a way to display the result directly. I flash an LED for each digit, e.g. 3 flashes...pause...5 flashes...pause...6 flashes. Modulate it at 40 kHz and parallel with an...
Have you done any successful programming using that connector? Did you recently install it? Check for shorts between pins.
If the circuit can handle varying supply voltage then you can simply connect a rechargeable (or not) battery across the external power supply. 3.55 volts is a good match for a...
You say you disabled the timer, but what about other interrupts that may be occurring between each step or breakpoint?
Power line communication might be an option https://en.wikipedia.org/wiki/Po...
Pages