Kerry Wong writes: DS3232 is an extremely accurate RTC with a guaranteed accuracy of 2.5 ppm (0 °C to 40 °C), which translates into an error of just 80 seconds over the course of a year under the worst case scenario. I had done a few projects using this chip before (you can read about […]
Tag Archives: resistor
Using traces as resistors
NsN writes: A while ago I needed some small value resistors as current shunts and I started wondering about the feasibility of using traces as resistors. There are many theoretical reasons as to why copper traces make bad shunt resistors, but I found surprisingly little practical data. The traces are (from left to right): – […]
Resistor reels just arrived
63 resistor reels just arrived for a test 0603 OOMP part book. Books and sheets should be here tomorrow. We’ll stuff some samples and get an idea of the time involved this weekend if everything goes smoothly.
Decade resistor box with jumpers
Mats informs us of GerrySweeney’s inexpensive Decade programmable resistor: I bought this 7-decade resistor box from Gerry Sweeeney for $18. It’s a really nice little cheap tool – much cheaper than the models with switches or thumbwheels that usually are 5-10 times as expensive as Gerrys version.
DIY hand-wound resistors
Need higher power resistors, or heaters, as we like to call them? Build them yourself. Matseng hand-wound 6 meters of 38AWG wire to build 12 ohm resistors. He used a pencil and some kapton tape as the base for the resistor. I needed two power (just ~1 watt) 12 ohm resistors for a project and […]
Replacing resistor arrays with single 0603 resistors
If a project calls for resistor arrays, but all you have are singles and mad soldering skills, you can try this hack. Yoganerdnl used a bunch of 0603 resistors on their side to replace the resistor arrays on his Bus Pirate SOIC DIY edition board. It takes patience and a steady hand, but it’s a […]
22k + 1k + 1k resistor arch
This is a fun hack on arhi’s DIY HAKKO (and SOLOMON) soldering pencil driver: 240 gain requires 24K resistors there, not really available easy … I soldered 22k + 1k + 1k (look at picture attached, it is 2×1206+0804 on top :D it works but .. ) Via the project log forum.
Resistor divider calculator
Ultrasounder shared a resistor divider calculator spreadsheet: Don’t we all have had frustrations galore when we were trying to fine tune the resistor divider for our voltage feedback on PS and LODs? Well, my good friend Art Nace came up with this wonderful tool to calculate the best fit values for the resistors for dividers. […]