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Power Changeover Switch - Ingenious Circuit Needed
How about feeding the AC through a polyfuse then saturable reactor that crowbars when DC is running through the control winding?
Saturday, 20 June 2020 - 12:45
In search of RF generator
SDR transmitters can cover a large range.   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...
Sunday, 17 May 2020 - 10:09
How would I efficiently measure multiple cell voltages of my own supply?
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...
Saturday, 1 February 2020 - 12:52
How would I efficiently measure multiple cell voltages of my own supply?
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...
Friday, 31 January 2020 - 13:27
How To Achieve 'use-while-you-charge' Functionality with a Li-Ion Battery Powered Calculator.
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...
Tuesday, 20 March 2018 - 15:54
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...
Tuesday, 27 June 2017 - 00:24
help with raven usb stick(Target voltage outside range")
  Have you done any successful programming using that connector? Did you recently install it?  Check for shorts between pins.
Tuesday, 30 May 2017 - 23:49
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...
Tuesday, 9 May 2017 - 14:16
ATmega328P - LDS instruction takes hundreds of cycles
You say you disabled the timer, but what about other interrupts that may be occurring between each step or breakpoint?
Sunday, 16 April 2017 - 12:38
Interfacing landline with avr
Power line communication might be an option
Friday, 7 April 2017 - 11:46