Everyone's photos, videos and docs, with the keywords: "voltage"

Danger of Death

nobody@ipernity.com (Esther) — Tue, 31 Dec 2019 01:53:28 +0000

Esther has posted:

Tel Aviv, Israel

AIMG 4155

Red Seal Dry Battery: The Choice of a Nation, 1919

nobody@ipernity.com (Alan Mays) — Mon, 08 Sep 2014 21:24:34 +0000

The choice of a nation. Red Seal Dry Battery. Guaranteed for all open circuit work. For ignition and all other work requiring high amperage. Red Seal Dry Battery. For ignition and all work requiring high amperage. Positively guaranteed for all open circuit work.

A battery suitable for every use. Battery of 5 dry cells connected in series. Voltage about 7½. Amperage above 20. Battery of 10 dry cells connected in multiple series. Voltage about 7½. Amperage above 40. The guarantee protects you.

Ideal Auto Co., 19-21 S. 9th St., Lebanon, Pa. 1919. 1920.

Power supply - load test

nobody@ipernity.com (.:madworm:.) — Fri, 17 May 2013 12:04:20 +0000

.:madworm:. has posted:

Testing the power supply that came with my LED strip.

Made with gnuplot.

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:01 +0000

.:madworm:. has posted:

Still withing tolerances for 5V AVR chips. Lucky me! But I didn't have 'peak detect' turned on, so maybe there are some nasty spikes hidden in there. Better use a voltage regulator + 5.5V Zener diode in the future.

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:04 +0000

.:madworm:. has posted:

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:03 +0000

.:madworm:. has posted:

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:04 +0000

.:madworm:. has posted:

Now I'm absolutely certain that I will NOT use this to power any micorcontroller projects anymore without massive precautions.

My AVR ATmega chips seem to have survived this treatment so far, but I will NOT power the ATxmega boards with this thing directly. This cries for an additional voltage regulator + Zener diode just in case.

These spikes happen when turning on the output of the power supply (switched by relais). I haven't tested if any overshoot happens when pressing the voltage-increment buttons. It would be quite sad if changing the output by +-0.1V would create spikes.

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:02 +0000

.:madworm:. has posted:

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:02 +0000

.:madworm:. has posted:

Digi 35 CPU - voltage overshoot

nobody@ipernity.com (.:madworm:.) — Sat, 05 May 2012 06:33:02 +0000

.:madworm:. has posted:

floating voltages

nobody@ipernity.com (.:madworm:.) — Wed, 12 Aug 2009 21:04:40 +0000

.:madworm:. has posted:

This hopefully illustrates a bit where the 200Vpp were coming from, that made my fingers hurt. Only because of the bad GND connector... The symbols I've used may not be 100% correct ;-) Besides I don't care what kind of core the transformer has when I get zapped.

A bit more than 12V

nobody@ipernity.com (.:madworm:.) — Fri, 31 May 2013 18:12:27 +0000

.:madworm:. has posted:

That wall-wart is a piece of crap. It claims to spit out 12V DC, capable of 500mA. I used my dummy-load to test it a bit. I had to pull close to 700mA out of it to make its output drop to 12V. It will go into the recycling bin right away.

Fortuitously I found a switch-mode power supply that goes up to 15V. I'll use that one instead. As the wallwart only consisted of a transformer, rectifier diodes and a cap, all the battery charging logic must be in the car-jump-start device itself. Shouldn't be an issue.

LED strip - brightness vs. position

nobody@ipernity.com (.:madworm:.) — Fri, 17 May 2013 08:43:30 +0000

.:madworm:. has posted:

There's a voltage drop of about 1V across the 5m strip. Too much resistance. Needs multiple power injections to compensate.

Unexpected moment of luck

nobody@ipernity.com (.:madworm:.) — Tue, 26 Feb 2013 02:34:04 +0000

.:madworm:. has posted:

Initially I had put these bridge-pads on there to select which pins are + and - and connect capacitors to them. Today I used this board with an MCP1804-SOP23-5 voltage regulator. I had everything plugged in and was in need of another GND pin. Not just the one going to the chip, bot one going to the load. Thanks to these jumpers I could use the unused pin #5 (top row in the middle) and just bridge it to GND. I need more of these little moments!

high voltage - power for Ipernity

nobody@ipernity.com (Berny) — Sun, 13 Dec 2020 09:12:59 +0000

Berny has posted:

and here another view, first sun after a heavy rainfall