Difference between revisions of "Resistors"
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====Potentiometers==== | ====Potentiometers==== | ||
* https://www.eevblog.com/forum/metrology/oxco-design-questions/msg5724645/?topicseen#msg5724645 for metrology, if you are going after ppm, you may need a minimum current across a pot to prevent oxidization. | * https://www.eevblog.com/forum/metrology/oxco-design-questions/msg5724645/?topicseen#msg5724645 for metrology, if you are going after ppm, you may need a minimum current across a pot to prevent oxidization. | ||
| + | * https://www.edn.com/pwmpot-approximates-a-dpot/ Alternative to digital pots. Has advantages, such as higher resolution, but does not work at high frequencies. | ||
==Thin/Thick Film SMD Resistors== | ==Thin/Thick Film SMD Resistors== | ||
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https://www.eevblog.com/forum/beginners/digital-pots/msg5446562 | https://www.eevblog.com/forum/beginners/digital-pots/msg5446562 | ||
===Dip Switch Attenuator=== | ===Dip Switch Attenuator=== | ||
| − | + | <gallery> | |
| + | File:Dipswitchattenuator.jpg | ||
| + | </gallery> | ||
Dip switches are great. Here is a use of dip switches as an attenuator (N/V 2020 issue 5). | Dip switches are great. Here is a use of dip switches as an attenuator (N/V 2020 issue 5). | ||
| + | |||
| + | ===A Second Divider Switched In=== | ||
| + | It's possible to have a divider, then have a second divider switched in, on top of the first one, on an ad-hoc basis. The second one would be controlled by transistors, with the biasing resistor set properly to turn on a transistor at a given voltage. See Practical Electronics, June 2025, page 25. I need to test this. | ||
| + | <gallery> | ||
| + | File:Switchabledivider.png | ||
| + | </gallery> | ||
| + | |||
[[Category:online notes]] | [[Category:online notes]] | ||
Latest revision as of 02:45, 12 October 2025
Resist. Resistance is futile. Join the Resistance. Simply irresistible. Re:sister.
List
- https://www.eevblog.com/forum/projects/creating-a-track-resistor/ - impossible track resistor
- https://www.eevblog.com/forum/beginners/checking-for-noise-in-resistors/ - searching for noise in resistors. have setup with good resistor. compare to carbon dirt resistor. A note about old equipment with a 'noise' button, used for searching out bad components (see image of heathkit in thread).
- https://www.eevblog.com/forum/projects/ebay-75mm-slide-pots-interesting-taper/ Trap 'W' style audio equalizer potentiometer scale.
Potentiometers
- https://www.eevblog.com/forum/metrology/oxco-design-questions/msg5724645/?topicseen#msg5724645 for metrology, if you are going after ppm, you may need a minimum current across a pot to prevent oxidization.
- https://www.edn.com/pwmpot-approximates-a-dpot/ Alternative to digital pots. Has advantages, such as higher resolution, but does not work at high frequencies.
Thin/Thick Film SMD Resistors
- https://www.mouser.com/pdfDocs/20201116comparingthinfilmvsthickfilmchipresistors1.pdf - Stackpole Comparing Thin Film vs. Thick Film Chip Resistors Note that Thin film resistors have less noise, and may be preferred as bulk resistors for audiophile (low noise) applications.
Wire-wound Resistors
- http://www.learningaboutelectronics.com/Articles/What-is-a-fusible-resistor - There are other types of fusible resistors besides wire wound.
Tips/Techniques
200W 8 ohm Non Inductive Resistor
That's a big power resistor! Per Nuts and Volts 2022-5 https://www.parts-express.com/8-Ohm-200W-Non-Inductive-Dummy-Load-Resistor-019-030?quantity=1 They have 4. https://www.parts-express.com/electronic-parts/resistors-potentiometers/dummy-load-resistors
Ringing on a Digital Pot being used as a Voltage Divider via PWM
https://www.eevblog.com/forum/beginners/digital-pots/msg5446562
Dip Switch Attenuator
Dip switches are great. Here is a use of dip switches as an attenuator (N/V 2020 issue 5).
A Second Divider Switched In
It's possible to have a divider, then have a second divider switched in, on top of the first one, on an ad-hoc basis. The second one would be controlled by transistors, with the biasing resistor set properly to turn on a transistor at a given voltage. See Practical Electronics, June 2025, page 25. I need to test this.
