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A hand-wired circuit, for testing.
Altogether there is one SOT23-6 chip, two capacitors and five resistors that I glued to the bottom of a circuit board then soldered together. The four colored wires make connections to the PCB circuits.
For scale, those circular pads above are on tenth-inch centers.
IMGP5596
Final view of 5 level resistor box. This resistor box is build using five, single pole 12 position rotary switches and 50 wire-wound resistors.
Resistor tuners use a resistor to reduce the O2 sensor's signal voltage. I used a diode.
Diodes are a one way valve. Current can only flow through the anode end (no stripe). If current is put to the cathode end (striped end) it is blocked. For our use, the anode end (no stripe) connects to the sensor wires, and the striped end faces the bike's wiring.
Even though current is allowed through the diode, there is a voltage drop. Usually it's too big, approx. 0.7 volt. Schottky diodes have only a 0.15 to 0.4 voltage drop, and this just right to reduce the O2 sensor's voltage.
Get diodes rated for 1 to 3 amps of current. These heavier diodes have thick wires that are much easier to use. You will have to order them from a specialty electronics vendor.
The diodes that have worked for me; SB3H90, IN5820, BAT48, and similar diodes with a forward voltage loss of 0.15 to 0.35 volts.
Sorry about the crappy pictures, but someone (Hi Mark!) has been trying to get his flash up and running.
I have no desire to give a step by step how to build a flash and maybe kill yourself tutorial.
Try here :
www.glacialwanderer.com/hobbyrobotics/?p=490
Be safe kids and don't build one.
On top of my voltage multiplier are two current limiting resistors. Here is a picture.
Cheers.
This "IC" confused me for some time when I was a kid. It's really more of a thick film hybrid module with discrete components in it. I don't think we'd call it an Integrated Circuit today.
Next is all of the wires and stuff, of course! This is the start of a project from "Rip, Burn, Solder, Shred," a book by David Erik Nelson that I got for my birthday. The boys and I haven't gotten too much further than this yet, but we're going to finish it yet!
Internal view of 5 level resistor box. All the resistors in this resistor box are 5W wire-wound power resistors.
laughingsquid.com/photos-mozilla-labs-demoparty-at-nyc-re...
photo by Scott Beale / Laughing Squid
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A hand-wired circuit, for testing.
Altogether there is one SOT23-6 chip, two capacitors and five resistors that I glued to the bottom of a circuit board then soldered together. The four colored wires make connections to the PCB circuits.
For scale, those circular pads to the right are on tenth-inch centers.
IMG_20130321_190756
A 34year old Audiophile Amplifier Needing Parts Replacement : Nikon D3X, Micro Nikkor 55mm f/3.5 Auto type F, ring light / back light
+ yes, my 34yr old amp is needing upgrades :). Almost all electrolytic capacitors are leaking and the trimmer resistors are becoming unreliable. Power switching capacitors are also showing signs of cracking. I also want to change the potentiometer to dual type. Even with all of these issues, the amp still sounds great. With all the upgrades, now the sound is more refined and I thought it already was, before the parts were failing. :)
+ the original amp was using ALPS potentiometer as well but these are 30+ yrs old :), so it really needs to be upgraded.
+ all cameras are tethered via Phase One 8
+ all electronic parts are purchased via RS components
Perth, Western Australia.
Featuring: tigapics, branded, reetbot, phook, bytedust, 14bolt, billikid, delme, suspecto, buddy barbados, bell, ciah, riot68, resistor, 7ad, lare, 2tone
NEW and IMPROVED!!! Now including: serch, thinkwar, some more 2tone and resistor.
Top view showing the alternating positions of the resistors, pulled down as tight as possible. (1/8W recommended as opposed to 1/4W due to size considerations)
A while back, I did this commission for a client - he had to part with it, but missed it so much, he commissioned it again... this time with an LED visor. The bright red LED and electronics are all self-contained in the head, wires, resistor, battery and switch. We also added articulated hands (c/o Ariel Lemon via Shapeways)
Make a Resistor Helper – Papercraft Resistor Calculator!
www.adafruit.com/blog/2012/04/26/resistor-helper-papercra...
108 non-standard resistor values in two stacks of envelopes. Includes oddball values like 4.99k, 2.43k, etc. Yes, some DIY projects out there use them.
Tom's fine Tek 115 Pulse Generator from 1969.
There are two tunnel diodes in this picture, hidden under resistors.
Handy repair kits by Ken K4EAA, For the KENWOOD / TRIO
TS-830S TS-530S Valve / Tube PA Hybrid Transceivers,
4 x 20 ohm cathode resistors, 2x 100 ohm screen and 470 ohm
Rectifier board screen resistor, Final cage cap replacements etc,
All easy to fit
73, de Dave 2W0DAA / GW4JKR
Free Photos – 10W, 1.5 Ohm – Ceramic Resistor
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so i was out the other evening playing with star trails, and i realised i needed a torch to help me focus on a object in the foreground. but turnes out the torch wasn't working. so i came in to find the torch looking like this.
p.s. it was a broken glass resistor that was soldered into the circuit board, therefore no more torch!
Handy repair kits by Ken K4EAA, For the KENWOOD / TRIO
TS-830S TS-530S Valve / Tube PA Hybrid Transceivers,
4 x 20 ohm cathode resistors, 2x 100 ohm screen and 470 ohm
Rectifier board screen resistor, Final cage cap replacements etc,
All easy to fit
73, de Dave 2W0DAA / GW4JKR
the prototyping week ahead... thats a little resistor he is looking at :)
I will be starting prototypes of my FYP this week :)
Splice into the red (+5v) and black (ground) wires and solder in your chosen LED and resistor combination. (Please excuse my messy work, I'm not that good at soldering.)
As for the selection of LED and resistor, I leave the choice up to you. I prefer blue to go with all the other blue LEDs. Some others think blue LEDs have become too commonplace and suggest white ones instead.
As for the resistor, you can obtain the proper resistance value from the formula: R = (supply_voltage - LED_voltage) / LED_current. The supply voltage here is 5 volts (from USB). My LED is 3.3v/30mA, so for me, R = (5 - 3.3) / 30 = 56.666... Therefore, I picked the closest resistor with higher resistance: 68 ohms.
Ever wondered what a resistor looks like inside or how it works? You can see the wire winding that surrounds the ceramic core very clearly on this one. This is from our article on how resistors work.
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Whilst i had the Trio TS-530S PA final board out to check it, I found the cathode and screen resistors still working, But as the radio was manufactured in 1981 i have decided to fit new resistors just in case!
73, de Dave 2W0DAA / GW4JKR
MintyBoost hack. Shuffles and (some?) video iPods do "sensing" before they will go into charging mode. Using a 10k 'pulldown' resistor across D+ and GND does the trick. The next generation MintyBoosts will supposedly already have this in place.
BTW, this is very difficult to solder just right. I recommend pre-cutting and fitting, then using some super-glue to get the resistor held in place. Then solder.